The Armor Glossary

A detachable component of body armor designed to extend protection to additional body parts beyond what the primary armor covers, safeguarding against various threats such as ballistic impacts, stabbings, and blunt force. Common accessories include pieces for the shoulders, upper arms, neck, sides, pelvis, and groin.

Metal alloy failure from rapid thermal softening around impact, causing material weakening and failure.

US Army helmet from 2002, replacing PASGT with MICH design influences.

Space between armor elements, reducing effectiveness in ceramics and body armor.

Aluminum oxynitride, transparent ceramic armor material by Surmet Corporation.

Popular ceramic armor material, common in industrial use and body armor.

Armor plate from aluminum alloy, used in vehicles for its lightweight and strength.

Refers to one or more loaded cartridges, each composed of a casing, primer, propellant, and projectile(s), designed for use in firearms.

Loss of crystalline structure under high pressure, common in boron carbide.

Solid lacking ordered structure, like glass, some polymers, and amorphous metals.

The angle between the line of aim of a test threat and a perpendicular line from the surface of the target's backing material. This concept is crucial in understanding how projectiles impact and interact with armor surfaces under test conditions.

Angle between a projectile's trajectory and the target's surface.

Describes an impact on an armor plate at an angle greater than zero degrees, contrary to common belief, angle strikes increase the effective thickness of the plate against the projectile, potentially improving the armor's stopping power.

Material with varying properties in different directions.

A type of ammunition designed to penetrate armor and protective gear, utilizing hard core materials such as steel, tungsten, or depleted uranium to achieve high penetration capability against armored targets.

AP bullet with incendiary mixture for explosive impact.

7.62x63mm (.30-06) armor-piercing bullet with a steel penetrator.

A molded item from backing material, shaped for testing or conditioning nonplanar armor items, assisting in accurately evaluating the protective performance of curved plates or female-specific armor designs.

Additional armor applied to an existing system for enhanced protection.

A category of strong, heat-resistant synthetic fibers used in a wide range of applications, including ballistic protective clothing and equipment. Aramid fibers are known for their durability, strength, and resistance to abrasion and heat.

A critical metric in armor design, reflecting the weight per unit area of an armored panel. Lower areal densities are desirable for maintaining protection while minimizing weight, enhancing mobility and comfort for the wearer.

Also known simply as a carrier, this is a garment designed to hold and secure armor panels or plates against the body, providing a system for wearability and protection.

A specific design or version of body armor with unique specifications and characteristics, identifying a particular set of protection capabilities and construction details.

A protective element of soft body armor, made of materials like Kevlar or UHMWPE, enclosed typically in a fabric cover, designed to offer protection against specific threats such as bullets, stabs, or blunt impact.

Details the standard practice for abrasion resistance of printed materials by the Sutherland Rub Tester, relevant for evaluating the durability of labels and markings on body armor.

Focuses on the practice of using significant digits in test data to determine conformance with specifications, emphasizing the importance of precision and accuracy in test measurements.

Details the specifications for preparing and verifying clay blocks used in ballistic-resistance testing of torso body armor, ensuring a consistent medium for backface deformation measurement.

Provides terminology for body armor, standardizing the language used in the description, testing, and evaluation of ballistic protection gear.

Describes the test method for measuring resistance to penetration and backface deformation for ballistic-resistant torso body armor and shoot packs, providing a standardized approach to evaluate armor performance.

Outlines the test method for collecting ballistic limit data for ballistic-resistant torso body armor and shoot packs, aimed at determining the velocity at which a projectile is expected to penetrate the armor 50% of the time.

Describes the test methods for ballistic-resistant head protection, ensuring helmets meet specific protection standards against ballistic threats.

Specifies the test method for ballistic-resistant products and shoot packs, offering guidelines for assessing the protective capabilities of various ballistic-resistant items.

Focuses on soft armor conditioning by tumbling, providing a method to precondition body armor materials for testing, simulating wear and environmental exposure.

Specifies the standard for ballistic-resistant shields used by law enforcement officers, outlining the criteria for design and performance of protective shields.

Sets the specification for ballistic-resistant helmets worn by U.S. public safety officers, detailing the performance requirements and testing methods for head protection gear.

Proportion of atoms of one element to the total in a compound or alloy.

Material that thickens when stretched, opposite of most materials.

Support material in composite armor, enhancing ceramic plate effectiveness.

The deformation occurring on the inner surface of armor when it stops a non-penetrating projectile. Controlled back face deformation is crucial for preventing blunt force trauma to the wearer, with standards set by organizations such as the NIJ to ensure safety.

The indentation or bulge on the side of armor backing material that faces the wearer, caused by the force of a non-penetrating projectile impact. This is a critical factor in assessing armor performance, especially concerning potential injury to the wearer.

A part of the testing setup for body armor, consisting of materials (like clay) that simulate human tissue, used to measure backface deformation upon projectile impact.

Steel microstructure offering balanced hardness and toughness.

General-purpose ammunition, not specifically designed for armor-piercing.

Fabric made from high-strength fibers, used in armor.

Minimum velocity at which a projectile reliably penetrates armor.

Heavy, high-denier nylon fabric used in early soft body armor.

A type of armor panel specifically designed to provide protection against ballistic threats by stopping or slowing down bullets.

How projectiles penetrate different armor materials.

The ability of protective gear or materials to prevent or minimize penetration, deformation, or damage from ballistic projectiles.

Portable barrier providing protection against projectiles.

Study of projectile dynamics in various contexts, including internal, external, terminal, and forensic.

Lightweight, stiff metal explored for armor use but limited by toxicity.

See Backface Deformation.

See Backface Signature.

Injury resulting from the force transmitted through armor despite non-penetration, highlighting the importance of minimizing backface deformation in armor design.

The physical damage caused by the impact force of a projectile on armor, despite non-penetration, leading to potential injuries ranging from bruising to more severe internal damage, emphasizing the importance of limiting back face deformation in armor design.

Personal protective equipment intended to shield the wearer from various threats, including gunfire, stabbing, fragmentation, and impact. Often referred to colloquially as a vest.

Markings on armor plates indicating the side that should face the wearer, ensuring optimal ballistic protection orientation and effectiveness against incoming projectiles.

A manufacturing process that chemically or physically joins the bullet's jacket to its core, enhancing integrity upon impact and preventing separation. Bonded bullets are known for their consistent penetration and expansion, making them suitable for hunting and law enforcement applications.

Ceramics combining boron with metals or metalloids, like titanium diboride.

Lightweight, hard ceramic used in high-end armor plates.

Ceramic with two forms

Hard ceramic investigated for armor use, with synthesis challenges.

Breakage with little plastic deformation, common in ceramics and hard metals.

A protective garment designed to resist the penetration of bullets, offering varying levels of protection based on the design, materials used, and the specific threats it is rated against.

See Backface Deformation.

The projectile component of a cartridge, which is propelled through the barrel of a firearm by the force of the propellant's ignition. The design, material, and weight of bullets vary widely depending on their intended use, ranging from target shooting to hunting and ballistic protection testing.

A term commonly used but technically inaccurate, as soft armor, hard armor, helmets, shields, and other ballistic resistant platforms are designed to offer bullet resistance within specific threat levels. The term emphasizes the goal of providing the highest possible level of protection against firearm threats.

Laminated transparent armor made from glass and plastics like polyurethane, PMMA, or polycarbonate.

Measurement of bullet diameter, critical in defining ammunition specifications and compatibility with firearms, expressed in millimeters or inches, indicating the size of the projectile and influencing its ballistic behavior.

Ceramic material of metal/metalloid and carbon, used in armor and industrial tools.

Strong, stiff fibrous material for structural composite panels, not typically used for ballistic purposes due to brittleness.

Hollow, graphitic carbon tubes with potential for high strength materials, limited success in reinforcing applications.

Synthetic silicon carbide, polycrystalline form used in abrasives and armor.

A piece of equipment, often resembling a vest, designed to hold ballistic panels or plates, providing the wearer with protection and support. Typically, available in overt (external) and covert (under clothing) styles as well as plate carriers and other terminology used.

The complete unit of ammunition, consisting of the bullet (projectile), casing (shell), powder (propellant), and primer (ignition component). Cartridges are designed for specific firearms and calibers, ensuring proper fit, function, and ballistic performance.

The component of a cartridge that houses the primer, powder, and bullet, typically made of brass, steel, or aluminum. The casing is expelled from the firearm upon firing, in the case of semi-automatic and automatic weapons.

A UK standard for body armor, detailing the specifications and testing methods required for protective vests to ensure they meet safety requirements.

Inorganic, non-metallic, synthetic material, used for its hardness, heat resistance, and low density.

Ceramics reinforced with fibers or particles, used in demanding armor applications.

A key component in hard body armor, made from materials such as alumina oxide, silicon carbide, or boron carbide, offering high hardness and ballistic resistance. Ceramic plates are critical for defeating high-velocity threats.

Ceramic material with metallic binder phase, used in armor and industrial applications.

Foam ring on armor plates to prevent edge damage, sometimes used to reduce manufacturing costs and the weight of a product by having the area of coverage appear larger than it is.

Specializes in ballistic resistance testing of body armor and personal protective equipment, ensuring compliance with national and international standards.

Tank armor with ceramic composite tiles between steel layers, sometimes including depleted uranium.

A type of backing assembly utilized in body armor testing, where modeling clay, such as Roma Plastilina #1�, serves as a medium to record backface deformation upon projectile impact.

A condition observed in armor testing when a projectile or its fragments pass through the armor, indicating a failure of the armor to stop the threat under the test conditions.

Carbides with mixed metallic elements, found in tool steels and some armor.

Armor materials made from combining different substances to achieve optimal ballistic protection, light weight, and flexibility. Composites often involve layers of fibers and resins to create barriers against various threats.

Armor combining different materials for improved protection, such as ceramic and fiberglass.

Strong metal foam with embedded metallic spheres, investigated for vehicular armor.

Refers to armor designed to be worn discreetly under clothing, emphasizing stealth and everyday carry (EDC) considerations for users requiring unobtrusive ballistic protection.

The process of exposing armor or materials to specific environmental conditions or physical stresses to simulate wear and aging before testing their performance.

Test firing with gun barrel touching the armor, used in specific armor testing protocols.

A standardized testing environment with specific temperature and humidity conditions (20°C ± 5.5°C and 50% ± 20% RH), ensuring consistency in the evaluation of body armor performance.

Polymer with two or more types of monomers, varying in arrangement and properties.

Durable nylon fabric used in body armor carriers and plate wraps.

Natural form of alumina, used widely in industry and armor.

Small armor sample for ballistic testing, used in R&D.

Armor designed to be worn discreetly under clothing, providing protection while remaining inconspicuous, suitable for various professions requiring unobtrusive ballistic protection.

Originating from formal attire, in ballistic armor, a cummerbund refers to a lateral support mechanism attached to plate carriers. It helps stabilize the carrier on the wearer and provides additional mounting space for equipment via MOLLE webbing.

Formula estimating ceramic material's ballistic merit based on mechanical properties.

Established by the Drug Enforcement Administration, this protocol outlines specific criteria for testing the ballistic resistance of body armor. The 2019 update introduces revised standards and testing methods to reflect the evolving nature of threats faced by DEA agents, emphasizing the need for high levels of protection.

Armor meeting US Drug Enforcement Administration's ballistic specifications, stringent for soft armor.

Measure of repeat units in a polymer molecule, relevant for ballistic fibers.

A unit of measurement for the linear mass density of fibers, indicating the thickness and weight of yarn used in ballistic fabrics. Lower denier fibers are finer, while higher denier fibers are thicker and potentially more durable.

Dense uranium alloy with reduced 235U, used for high-density projectiles with self-sharpening and pyrophoric properties.

Evaluates ceramic materials by comparing penetration depths of a projectile into a semi-infinite block with and without ceramic tile.

Adding impurities to ceramics to enhance stability and performance, like silicon in boron carbide.

Early fiber composite armor of compressed fiberglass and polyester resin, obsolete with Kevlar introduction.

A crucial safety feature on plate carriers, located on the back plate pocket, allowing for the rapid evacuation of an injured wearer from dangerous situations. Drag handles vary in design but are universally intended for use in emergency extractions.

Assesses ceramic armor plate durability by dropping it onto a hard surface.

Composite steel with a hard martensitic layer bonded to a tough, low-carbon steel back, complex to manufacture.

Alloy with martensite and ferritic iron, offering ductility and strength for armor.

Penetration mechanism where the projectile displaces target material without shattering it.

Delay in ceramic armor penetration as a projectile momentarily stops before breaking through.

A brand of high modulus polyethylene (HMPE) fiber known for its exceptional strength-to-weight ratio, used in ballistic fabrics and composites for protective gear.

Alumino-borosilicate fiberglass used in older armor systems, now largely replaced by stronger materials.

Enhanced Combat Helmet made from strong UHMWPE, offering superior protection but similar to ACH/MICH.

Occurs when a projectile impacts the very edge of a plate. Certain materials, like polyethylene (PE) and ceramics, may fail to stop an edge strike due to the abrupt end of material strength and structural integrity at the plate's edge, leading to potential penetration.

Explosively formed penetrator, a high-velocity projectile formed by explosive forces, effective against armored vehicles.

Offers comprehensive testing services for a wide range of materials and products, including body armor, to verify their performance and safety.

Focuses on testing the durability and ballistic resistance of protective gear, providing critical data on their effectiveness in hostile environments.

Often confused with AP ammunition, EP rounds like the 5.56x45mm M855 Green Tip feature a core not intended for armor penetration but for overcoming barriers like glass or thin metal. Despite their design, EP rounds may not always perform well against advanced ballistic armor due to their specific construction and intended purpose.

Resin used in composite materials for its strength and adhesion, less flexible than polyurethane.

Expanded polypropylene foam used in helmet pads for impact absorption.

Expanded polystyrene foam used in armor padding, similar to EPP but related to Styrofoam.

Enhanced Small Arms Protective Insert, thicker and heavier than SAPI but offering higher protection levels.

Load-distribution or powered strength-enhancing system, not widely used due to battery limitations.

Armor designed to counter shaped charges, consists of steel plates with explosives in between.

In the context of testing body armor, a projectile impact that fulfills all specified conditions of the test method, such as location on the target, velocity, and angle.

The United States' principal federal law enforcement agency, which also conducts research and sets standards for law enforcement equipment, including ballistic protection gear.

The FBI developed a testing methodology to evaluate body armor performance under conditions simulating real-world use. This protocol examines the armor's resistance to various ammunition types, ensuring law enforcement officers are adequately protected.

Long, thin material, natural or synthetic, used in ballistic fabrics and composites for strength.

Main penetration mechanism in fiber composites, where impact exceeds fiber's failure strain.

Material reinforced with fibers in a polymer matrix, used in most modern armor applications.

Glass fiber and composite, used in older armor systems and vehicle spall liners.

Inert substance added to polymers to modify properties, like stiffness and strength.

A type of ammunition where the bullet is encased in a harder metal shell, reducing deformation upon impact and increasing penetration capability.

Cellular material used in armor for padding, with variations like open-cell (absorbent) and closed-cell (water-resistant).

A measurement unit for velocity, particularly relevant in the context of ballistics, indicating the speed at which a projectile travels. Understanding FPS is crucial for assessing ammunition performance and armor penetration capabilities.

Inverted cone of broken material formed upon high-speed projectile impact on ceramic armor, dispersing kinetic energy.

Fragmentation is the breakup of a larger object into smaller, high-velocity particles caused by either high-speed impact with a hard surface or an internal explosive charge. It presents significant secondary injury risks in ballistic scenarios.

Weapon dispersing high-velocity metal fragments upon explosion, often stopped by armor due to low sectional density.

Metal pieces propelled by explosions or impacts, variable in size and shape.

Standardized steel projectile for armor testing against fragmentation threats.

Composite with gradual property changes, complex to manufacture, used for specialized applications.

Focuses on police armor, detailing the protective capabilities required to defend against specific ballistic threats common in China.

Brass alloy used in bullet jackets for softness and ductility, facilitating gas-seal and rifling engraving.

Another term for an angle strike, highlighting the scenario where a projectile impacts armor at an angle other than perpendicular, which can increase the chance of the projectile being deflected or its effective penetration depth reduced due to the increased material thickness it encounters at an angle.

Partially crystallized glass with good hardness and low density, used in some armor systems for transparency and ballistic protection.

Applies to protective gear designed to safeguard against cold weapons, firearms, and shrapnel, outlining the criteria for effective body armor.

A unit of weight measurement used for bullets and propellant, crucial for understanding ammunition specifics. One grain is equal to 1/7000th of a pound or approximately 0.065 grams, and bullet weights are often expressed in grains to denote their mass.

Single-layer carbon sheet with potential for reinforcement in materials, current applications limited.

Protective gear made from rigid materials, including ceramics, metals, composites, aramids, or a combination of those materials designed to offer heightened protection against higher-level threats like rifle bullets, stabs, and explosive fragments.

Aramid fiber and composite material brand by Kolon Industries, similar to Kevlar.

Complex metal alloy without a base metal, offering unique properties for potential armor applications.

UK standards body for police body armor, similar to US NIJ

A detailed procedure for assessing the ballistic and impact protection offered by helmets. Developed by HP White Laboratory, a leading authority in ballistic and impact testing, this procedure ensures that helmets meet rigorous safety standards, providing essential head protection for military and law enforcement personnel.

A category of polyethylene fiber known for its high strength and used in the construction of ballistic fabrics and composites.

Refers to armor systems that require combination with other armor types to achieve the desired level of threat resistance, typically involving a hard plate backed by soft armor to capture spalling and enhance ballistic protection.

A material's property affecting how pressure waves travel through it, significant in armor design for energy transfer and minimizing damage.

Armor designed to achieve its specified level of protection only when used together with another specified armor type, typically involving a combination of soft and hard armor components.

A removable protective material, either soft or hard armor, intended for placement in a carrier's pocket to enhance localized protection.

Armor that is part of a vehicle's structure, providing both load-bearing and protective functions, usually metallic due to limitations of ceramics and fiber composites.

The boundary between different materials or layers in armor systems, crucial for performance, especially in layered composite and ceramic armors.

Stopping a projectile at the surface of a ceramic tile, typically achieved with thick ceramics under compression or complex systems configurations.

Ceramic-like compounds from two metals, offering unique properties for niche applications and sometimes strengthening metal alloys.

US military body armor system replacing the IBA, noted for slightly reduced bulk and increased modularity.

International standard proposing performance requirements and test methods for body armor, emphasizing resistance to rifled weapons and shotgun impacts in repetitive testing.

Metal layer encasing a bullet's core to prevent barrel fouling and ensure a tight gas seal, usually made of gilding metal or other soft alloys.

A type of bullet designed to expand upon impact, maximizing energy transfer and stopping power against soft targets while reducing the risk of over-penetration.

Bullets that combine features of FMJ and JHP designs, with a partially exposed lead core at the tip to facilitate controlled expansion upon impact. JSP rounds are often used in hunting due to their ability to offer both penetration and expansion, making them effective for taking down game while minimizing the risk of over-penetration and collateral damage.

A trademarked brand of aramid fiber developed by DuPont, renowned for its high tensile strength and thermal stability, widely used in ballistic protection applications.

Informal term used to describe a complete set of tactical gear, including a plate carrier, armor plates, and attached pouches and accessories, prepared for immediate use in field or combat situations.

Brand of polystyrene-elastomer copolymers used in manufacturing UHMWPE composites for armor applications.

Heavy, soft metal historically used in ammunition, facing phased replacement due to environmental and health concerns.

NIJ armor ratings, each defining a specific level of ballistic protection, with higher numbers indicating the ability to stop more powerful projectiles.

High-performance pellet armor offering exceptional protection, noted for military evaluation but limited commercial development.

Experimental armor concept using fluids that stiffen under stress to improve ballistic performance, facing challenges in stability and practical application.

Class of polymers forming ordered structures in liquid or solution, used in high-performance fibers for armor.

Technology in military gear that reallocates weight to reduce strain, incorporating features like hip belts connected to armor carriers.

High-velocity, dart-shaped projectiles used in military tank ammunition, effective against armored targets due to high penetration capability.

A classification of ammunition indicating high-velocity rounds designed for long rifles, which pose significant penetration challenges for body armor.

A bullet design featuring a smooth, rounded nose made entirely of lead. This design is favored for its ease of feeding in firearms and its impact behavior, which includes moderate penetration and energy transfer. LRN bullets are commonly used in target shooting and some types of hunting.

Lightweight armor material investigated for aerospace and vehicle applications, facing challenges due to cost and corrosion susceptibility.

Hard, strong steel microstructure obtained through rapid cooling, crucial for military applications including armor.

Continuous phase in a composite material, surrounding and supporting the dispersed phase, essential for the material's overall properties.

Penetration mechanism in low-melting point materials like UHMWPE, where heat from projectile impact causes the target material to melt and fail.

Metal reinforced with ceramic particles to improve properties like hardness and thermal stability, with applications in niche armor systems.

Combat helmet designed for US Special Forces, setting the standard for modern military helmets with features like padding and ballistic protection against specific threats.

The arrangement and characteristics of grains, phases, and inclusions in metals and ceramics, observable under magnification, influencing material properties.

Details specifications for ultra-high-hardness armor plate steel, aiming to ensure that materials used in armor plating offer superior protection against ballistic threats.

Specifies the requirements for aramid cloth used in ballistic applications, ensuring that materials meet rigorous standards for durability and protection.

Provides the specifications for high-hardness armor plate steel, emphasizing the importance of material strength in protective applications against ballistic impacts.

Sets the criteria for the V50 ballistic test for armor, determining the velocity at which a projectile is expected to penetrate armor 50% of the time, critical for evaluating protective gear effectiveness.

Outlines the environmental engineering considerations and laboratory tests for military equipment, ensuring gear is capable of withstanding various environmental stresses.

Common, low-cost steel with low carbon content, characterized by softness and ductility, used in various applications including bullet cores due to its affordability.

Refers to the specific design and configuration of body armor or protective equipment, characterized by unique features that distinguish it from other variants or models offered by the manufacturer.

A measure of a material's elasticity, representing the ratio of stress to strain in a material. In the context of ballistic fibers, a higher modulus indicates a stiffer fiber, which is less prone to stretching under load, enhancing the material's ballistic resistance.

A standardized webbing system integrated into tactical vests and plate carriers, allowing for the attachment of various pouches and accessories, facilitating customizable loadouts and equipment configurations.

Describes a ceramic composite armor's strike face made from a single, large ceramic tile, as opposed to being composed of multiple smaller tiles.

Ceramic composite armor with a strike face composed of numerous small ceramic tiles arranged in a pattern, potentially improving multi-hit resistance at the cost of single-shot performance.

A type of bullet featuring a core made of mild steel, which provides increased penetration capabilities over standard lead-core bullets. MSC bullets are often used in military applications where enhanced penetration of light barriers or vehicle bodywork is desired.

Describes hard armor plates designed with curves in multiple directions to better fit the human body, enhancing comfort and wearability.

Describes an armor plate's capability to withstand impacts from multiple projectiles. While many modern plates are designed to handle several hits, exact performance can vary significantly depending on numerous factors including caliber, velocity, and point of impact.

Refers to an armor's ability to withstand impacts from more than one projectile. This capability is crucial for real-world scenarios where wearers may face multiple threats successively.

The process by which a bullet deforms upon impact to increase its diameter, reducing penetration depth but increasing the transfer of kinetic energy to the target. This term also describes the characteristic shape of back face deformation on armor after stopping a bullet.

Materials with grains or crystals smaller than 100 nanometers, offering improved strength and hardness due to the Hall�Petch relationship.

An organization responsible for ensuring the quality and reliability of scientific and technical testing services in Australia, including ballistic testing.

An intergovernmental military alliance that, among other things, standardizes military equipment and ammunition across member countries to ensure interoperability. NATO specifications for ammunition ensure that forces from different countries can share logistics and support more effectively.

The U.S. government agency responsible for establishing and maintaining performance standards for ballistic protection gear, including body armor. The NIJ certification is widely regarded as a benchmark for armor effectiveness and reliability.

Sets the standards for riot helmets and face shields, detailing the requirements for protective gear used in crowd control and riot situations.

Provides specifications for ballistic helmets, focusing on the design and performance standards required for law enforcement protective headgear.

This standard outlines the specifications for ballistic protective materials, guiding manufacturers in producing materials that meet performance and safety requirements against firearm threats.

Specifies the criteria for body armor to resist stabs, knives, and spikes, ensuring protective garments meet safety standards against sharp weapon threats.

Establishes standards for public safety bomb suits, detailing the performance requirements for protective suits designed to safeguard against explosive threats.

Establishes guidelines for the ballistic resistance of body armor, ensuring that such equipment is tested and rated for its ability to stop specific types of bullets under certain conditions.

Updates the ballistic resistance criteria for body armor, incorporating new testing methodologies, threat levels, and material technologies to reflect modern ballistic threats.

Defines ballistic protection levels, providing a detailed framework for categorizing the ballistic performance of body armor against various threat types.

Ceramic materials formed by combining metals or metalloids with nitrogen, generally less common in armor applications compared to oxides or carbides.

A penetration mechanism where a hard projectile penetrates a softer target without significant deformation of the projectile itself.

Describes armor or plates that are not flat, often designed with curvature to better fit and protect the body, including those tailored for female wearers.

Versatile synthetic polymer used in a wide range of applications, including ballistic fabrics and reinforced plastics for tactical and structural components.

The angle at which a projectile strikes the armor, measured relative to a normal line to the surface at the point of impact, influencing the effectiveness of the armor's protective capabilities.

Velocity range from 500 to 2000 meters per second, relevant for understanding ballistic performance and penetration mechanisms.

Dedicated to the testing of ballistic-resistant materials and body armor, ensuring that products meet stringent safety standards for law enforcement and military use.

A type of body armor designed for military use, featuring modular components that can be adjusted for varying levels of threat protection, including the integration of additional armor plates.

A projectile speed exceeding the specified maximum for a given test, which could impact the performance outcome of body armor testing.

Armor designed to be worn over clothing, visible to observers. This type often includes additional features such as magazine pouches and utility pockets, catering to tactical and military applications.

Ceramic materials formed by combining metals or metalloids with oxygen, including widely used and industrially important ceramics like aluminum oxide.

Materials that are intermediate phases or solid solutions of nitride and oxide ceramics, used in specific applications like transparent armor.

The outer layer enclosing the protective materials of an armor panel, shielding them from environmental factors like moisture and UV light.

A reference to the 9mm Parabellum cartridge, a standard for small arms ammunition designed by Georg Luger, widely used in handguns and submachine guns across various military and law enforcement agencies.

Design philosophy utilizing computational algorithms for optimizing product and system designs, increasingly relevant in armor design.

An outcome in armor testing where a projectile does not fully penetrate the armor, indicating a successful stop of the threat.

In armor testing, refers to a projectile penetrating the strike face but being stopped by the backing material, indicating effective armor performance.

Early U.S. military armor system consisting of a Kevlar helmet and vest, marking the introduction of aramid fibers in military body armor.

Steel microstructure offering a mix of strength and ductility, less common in armor applications compared to martensitic steels due to its properties.

Armor composed of spherical or capsule-shaped ceramic pellets, offering good multi-hit performance but at a cost to single-shot efficiency.

Hard core within a bullet designed to improve penetration through armor or hard targets, often made from materials like steel or tungsten.

A penetration mechanism characterized by ductile deformation and the formation of petal-like cracks, commonly occurring when large-diameter projectiles strike thin metal plates.

A fabric garment designed to hold armor plates closely against the body's vital areas, either over or under clothing. Plate carriers themselves offer no ballistic protection

Integral parts of a plate carrier designed to securely hold armor plates. Plate pockets are distinguished as Front and Rear, with rear pockets typically featuring a drag handle and permanent attachment points for cummerbunds or lateral supports.

A mechanism where a projectile punches out a cylindrical piece of the target material, common in harder alloys and influenced by the target's hardness.

Ammunition designed with a higher internal pressure to achieve greater velocity and stopping power. +P rounds must be used with caution and only in firearms specifically rated for their increased pressure levels, as they can cause accelerated wear or damage to weapons not designed for high-pressure loads.

Transparent, impact-resistant polymer used in various applications including transparent armor, noted for its clarity and durability.

Materials consisting of numerous crystals of varying sizes, encompassing most metals, ceramics, and some polymers.

Synthetic, extremely hard form of diamond with high toughness, of interest in armor for its potential superior performance.

Broad class of materials formed from repeating molecular units, serving as the basis for plastics, elastomers, and many structural materials.

Lightweight, semi-crystalline polymer used in fibers and reinforced tapes for applications requiring high stiffness and low weight.

Elastomeric polymers used as sealants and adhesives in military applications, known for their chemical stability and temperature resistance.

Elastomeric polymers used for coating and bonding in armor plates, favored for their toughness and resistance to environmental factors.

Versatile polymers used in fiber composites and adhesives in armor, chosen for their strength, bonding capabilities, and toughness.

The chemical propellant that, when ignited, generates gas to propel the bullet out of the firearm's barrel. Modern firearms typically use smokeless powder, which is more stable and produces less smoke than traditional black powder.

Reinforced fabric pre-impregnated with resin, facilitating the production of composite materials for armor and structural applications.

The small ignition component of a cartridge that, when struck by the firearm's firing pin, detonates to ignite the gunpowder. Primers are critical for converting the mechanical action of pulling the trigger into the chemical reaction that propels the bullet.

Any object propelled through space by the exertion of a force, which can include bullets, artillery shells, and other items launched at high speeds. In ballistics, the term specifically refers to the component of ammunition designed to strike a target.

Formula to evaluate armor�s effectiveness, combining V50 ballistic performance and areal density to assess overall protection merit.

Designation for a common 7.62x39mm ammunition with a mild steel core, used widely around the world and known for its distinct ballistic characteristics.

A UK-based organization responsible for the development and testing of police equipment, including body armor, establishing standards and protocols for protective gear.

A standard shape used in ballistic testing to simulate fragments or projectiles, providing a consistent test variable for armor evaluation.

A manufacturing process for ceramics where powders are mixed, shaped, and then infiltrated with a molten metal that reacts to form a cermet, used for making certain types of armor materials like silicon carbide.

Categories within the NIJ 0101.07 standard for rifle threat levels, indicating armor's capability to stop specific small arms projectiles at defined velocities, with RF1 being the least and RF3 the most protective.

A type of armor steel used primarily in military vehicles, known for its uniform composition and balance of hardness and toughness.

Similar to Kit, this slang term refers to a fully assembled and equipped plate carrier system, ready for operational deployment, encompassing both the ballistic protection elements and the load-carrying capabilities.

Refers to bullets with a rounded tip, designed to improve feeding in firearms and to strike a balance between penetration and impact energy transfer. Round nose bullets are used across a variety of shooting activities, from target practice to hunting.

A type of aramid fiber developed in Russia with superior strength and flexibility compared to other aramid fibers, used in high-performance ballistic applications.

A high-strength type of fiberglass used in some ballistic applications, offering better performance than E-glass but not as widely used as aramid or UHMWPE fibers.

Flexible panels made of high-strength fibers or composites that provide ballistic protection, designed to be inserted into carriers or vests.

A standardized military specification for body armor plates designed to protect against small arms fire, integral to modern soldier protection systems.

A form of aluminum oxide known for its hardness and transparency, used in specialized applications including transparent armor where clarity and resistance to scratching are critical.

A measure of a projectile's mass relative to its cross-sectional area, important for understanding its penetrative capacity and ballistic efficiency.

A type of munition designed to focus the energy of an explosive charge onto a small area, effectively penetrating armor through the formation of a high-velocity metal jet.

A phenomenon where an armor material exhibits different levels of protection against a projectile based on the projectile's velocity, with a specific velocity range where the armor is less effective.

Testing methodology designed to identify the presence of a shatter-gap effect in armor materials, involving shooting projectiles at varying velocities to measure the armor's protective capability across a range of impact speeds.

The measurement from the center of a projectile impact to the nearest edge of the armor panel or test item, important for ensuring test validity.

The distance between the centers of two projectile impacts on a test item, critical for assessing multi-hit capabilities and ensuring fair test conditions.

An essential component of plate carriers, linking front and rear plate pockets. Fully adjustable for fit and often equipped with quick-release mechanisms, shoulder straps ensure proper positioning of armor plates and facilitate rapid removal of the carrier if necessary.

A common compound used in glass and ceramics, with applications in armor systems where its properties contribute to the material's strength and durability.

A synthetic ceramic known for its hardness and thermal stability, widely used in hard armor applications for its ability to defeat high-velocity projectiles.

The process of modeling ballistic impacts and other events using computer software like LS-DYNA. This approach is increasingly sophisticated, allowing for complex armor system evaluations and optimizations through simulations.

Refers to armor plates that are curved along a single axis, designed to offer a more comfortable fit than flat plates but not as ergonomically fitted as multi-curve plates.

A method of fusing ceramic particles at high temperatures without melting them, creating a solid material from powder. This process is crucial for producing many types of ceramic armor materials.

Substances added to ceramic powders to facilitate sintering, promoting the fusion of particles to create a dense, strong material suitable for armor applications.

German ballistic testing standards focusing on aggressive testing criteria, especially for contact shots, providing a rigorous benchmark for ballistic protection performance.

Armor designed with an angled surface to increase the effective thickness against incoming projectiles and promote deflection, enhancing protective capabilities, particularly in vehicular armor.

Firearms intended for individual use, including handguns, rifles, and submachine guns. Armor systems are often rated based on their ability to withstand projectiles from these weapons.

Conducts a broad range of tests on body armor and ballistic materials, assessing their ability to protect against various threats and impacts.

Flexible armor made from layers of fibrous materials like aramid or UHMWPE, effective against handgun rounds and shrapnel but not designed to stop high-velocity rifle projectiles.

See Soft Armor.

The speed at which sound waves travel through a material, important in armor design for understanding how shock waves from impacts propagate through different layers of material.

Armor with air gaps between layers, designed to improve protection against certain types of threats by disrupting the penetration mechanism, commonly used in armored vehicles.

Fragments ejected from the surface of armor upon impact, potentially causing secondary injuries. Armor designs often include spall liners or coatings to mitigate this risk.

A failure mechanism where material from the rear surface of armor becomes secondary projectiles. This phenomenon is a concern in both personal armor and vehicle protection systems.

The phenomenon where material from an armor plate breaks away upon impact by a projectile, potentially creating secondary projectiles that can cause additional injury. Commonly associated with ceramic armor, where material breakage is a known risk upon ballistic impact.

The current standard-issue plate carrier system for U.S. military personnel, designed with a focus on balancing protection and mobility by providing essential ballistic protection while allowing for greater movement efficiency.

A measure comparing a material's mechanical properties to its density, which is important in armor design for optimizing protective performance relative to weight.

A type of high-strength, high-modulus polyethylene fiber used in ballistic protective fabrics, similar to Dyneema�, known for its exceptional strength-to-weight ratio.

A brand of UHMWPE composite material known for its high strength-to-weight ratio, commonly used in advanced body armor systems.

A natural fiber with exceptional strength and elasticity, researched for potential use in body armor due to its unique properties, though commercial use in armor is currently limited.

A ceramic material used in transparent armor, offering superior optical clarity and impact resistance, though its use is limited by cost and manufacturing complexity.

Military standards for ballistic protection, providing guidelines for testing and evaluating armor solutions for military applications.

A fundamental material in armor systems, available in various formulations and treatments to balance hardness, toughness, and weight for different protective applications.

Another term for partial penetration, indicating that the armor successfully halted the projectile before complete penetration.

The outer surface of an armor panel or plate that faces toward potential threats, designed to absorb and distribute the force of impacts.

A hard armor component, often made of ceramics or composite materials, designed to stop or deflect bullets, inserted into body armor systems for enhanced protection.

The entity responsible for ensuring that the body armor or protective equipment meets the established performance standards and maintains compliance with certification requirements.

A substitute projectile used in ballistic testing when specific threat rounds are unavailable or to achieve consistent test conditions, ensuring reliable armor performance evaluations.

A bullet design that combines features of both the round nose and the wadcutter bullets, with a flat front and a tapered cylindrical shape. SWC bullets are known for their ability to create clean, easily scored holes in paper targets, making them popular for competition shooting.

Armor specifically designed for tactical operations, offering both ballistic protection and functional features such as equipment pouches, tailored for law enforcement and military use.

A dense metal considered for use in high-density projectiles and armor-penetrating applications, though its use is limited by cost and availability.

A brand of aramid fiber known for its high strength, resistance to heat and chemicals, used in a variety of applications from ballistic protection to industrial products.

A brand of high-performance polyethylene fiber developed by DuPont, used in ballistic protection materials and other high-strength applications.

The study of projectile impacts, focusing on penetration, energy transfer, and the effects on targets, foundational in understanding and improving armor performance.

An individual piece of armor or component subjected to ballistic or other forms of testing to evaluate performance under specified conditions.

A set of tests conducted on a single armor item or across multiple items to accumulate the necessary data for evaluating the armor's performance against designated threats.

The specific type of projectile or other hazard used in the testing of body armor.

A German standard providing guidelines for ballistic vests, ensuring protective gear meets specific safety and performance criteria.

Polymers that become moldable upon heating, used in various components of armor systems for their versatility and ability to be shaped into complex forms.

Polymers that, once cured, do not soften upon reheating, used in armor composites for their durability and resistance to deformation under impact.

A metal with a high strength-to-weight ratio, used in specialized armor applications where its unique properties outweigh its higher cost compared to traditional armor materials.

A soft insert designed to be placed behind body armor panels to reduce the severity of backface deformation caused by a ballistic impact, helping to mitigate the risk of injury to the wearer.

A pad placed behind armor plates to mitigate backface deformation and reduce the force transferred to the wearer, enhancing comfort and protection against blunt force trauma during ballistic impacts.

A hard insert used in conjunction with body armor to provide additional protection against high-velocity impacts and to reduce backface deformation. Unlike soft trauma packs, trauma plates are rigid and made of materials like ceramics or metals.

A very hard ceramic used in armor-penetrating projectiles, offering high density and hardness but limited in armor applications due to weight and cost considerations.

An alloy known for its high density and used in projectiles for its penetration capabilities, though its application in armor is limited by various factors including cost.

A brand of aramid fiber manufactured by Teijin, similar to Kevlar�, used in ballistic protective equipment and other high-strength applications.

Refers to the orientation of fibers in a composite material where all fibers run in the same direction, offering strength and stiffness along that axis, commonly used in ballistic armor construction.

A fiber material known for its high strength-to-weight ratio, extensively used in modern body armor systems for its ability to stop high-velocity projectiles while remaining lightweight and flexible.

Specifies requirements for bullet-resisting equipment, focusing on materials and constructions that offer effective ballistic protection.

Refers to a situation in armor testing where the velocity of a projectile is below the specified minimum range. Testing at under velocity can be important for understanding the lower limits of an armor's protective capabilities.

In the context of body armor testing, an impact that does not meet the established criteria for a fair hit, possibly due to improper projectile placement, incorrect velocity, or other deviations from the test protocol.

A metric used in armor testing to define the velocity at which a projectile is expected not to penetrate the armor, essential for establishing the protective limits of a given armor system.

The velocity at which 5% of projectiles are expected to completely penetrate the armor, used to assess the threshold where armor begins to fail against a particular threat.

A statistical measure used in ballistic testing to determine the velocity at which a projectile has a 50% chance of penetrating a given armor material, - SAPI (Small Arms Protective Insert - Current Meaning)

A high-strength fiber with unique properties such as excellent cut resistance and stability under extreme environmental conditions, considered for advanced armor systems but limited by cost and specific use-cases.

A set of German ballistic protection standards that provide guidelines and testing protocols for body armor, offering an alternative to NIJ standards with a focus on different threat levels and performance criteria.

Focuses on bullet-resistant helmets, setting design and ballistic resistance criteria to ensure head protection gear meets safety and performance standards.

Establishes criteria for ballistic body armor, detailing performance standards for personal protective gear designed to safeguard against ballistic impacts.

Provides guidelines for ballistic protection in civilian vehicles, focusing on standards and methods to enhance vehicle safety against ballistic threats.

Addresses vehicle armor specifications, outlining requirements for materials and designs used in armored vehicles to enhance safety against ballistic threats.

Sets general standards for ballistic materials and test methods, offering a framework for assessing ballistic protection material performance.

Represents the velocity at which a given percentage (x) of projectiles are expected to completely penetrate the armor being tested, under specific testing conditions. This metric is useful for characterizing the protective performance of body armor against specified threats.

A cermet used in armor-piercing ammunition, valued for its hardness and density, enabling effective penetration of hard targets but less commonly used in armor materials due to specific application requirements.

The side of an armor panel or plate that is intended to be positioned closest to the wearer's body, designed to absorb and dissipate energy away from the wearer in the event of an impact.

Alloys designed for high density and impact resistance, used in specialized penetrators and projectiles, with limited direct application in armor but influencing the development of protective materials.

A failure mechanism in ballistic fabrics where fibers are pulled from the weave under impact, highlighting the importance of fabric structure and fiber bonding in the effectiveness of soft armor.

The angular deviation of a projectile's axis of symmetry from its line of travel. Yaw affects stability, penetration, and damage upon impact, influencing armor performance against ballistic threats.

A composite ceramic that combines the hardness of alumina with the toughness of zirconia, offering potential improvements in armor materials but challenged by cost and material processing considerations.

A high-performance fiber initially promising for ballistic protection due to its strength but later found to degrade under certain conditions, leading to its withdrawal from certain armor applications due to safety concerns.