Body armor, also known as body armour, personal armor or armour, or a suit or coat of armor, is
protective clothing designed to absorb or deflect physical attacks. Historically used to protect
military personnel
Military personnel are members of the state's armed forces. Their roles, pay, and obligations differ according to their military branch (army, navy, marines, air force, space force, and coast guard), rank ( officer, non-commissioned officer, ...
, today it is also used by various types of
police
The police are a constituted body of persons empowered by a state, with the aim to enforce the law, to ensure the safety, health and possessions of citizens, and to prevent crime and civil disorder. Their lawful powers include arrest a ...
(
riot police
Riot police are police who are organized, deployed, trained or equipped to confront crowds, protests or riots.
Riot police may be regular police who act in the role of riot police in particular situations or they may be separate units organi ...
in particular), private
security guard
A security guard (also known as a security inspector, security officer, or protective agent) is a person employed by a government or private party to protect the employing party's assets (property, people, equipment, money, etc.) from a variety ...
s or
bodyguard
A bodyguard (or close protection officer/operative) is a type of security guard, government law enforcement officer, or servicemember who protects a person or a group of people — usually witnesses, high-ranking public officials or officers ...
s, and occasionally ordinary civilians. Today there are two main types: regular non-plated body armor for moderate to substantial protection, and hard-plate reinforced body armor for maximum protection, such as used by combat soldiers.
History
Many factors have affected the development of personal armor throughout human history. Significant factors in the development of armor include the economic and technological necessities of armor production. For instance full
plate armor first appeared in Medieval Europe when water-powered
trip hammers made the formation of plates faster and cheaper. At times the development of armor has run parallel to the development of increasingly effective weaponry on the battlefield, with armorers seeking to create better protection without sacrificing mobility.
Ancient
The first record of body armor in history was found on the
Stele of Vultures in
ancient Sumer in today's south
Iraq
Iraq,; ku, عێراق, translit=Êraq officially the Republic of Iraq, '; ku, کۆماری عێراق, translit=Komarî Êraq is a country in Western Asia. It is bordered by Turkey to Iraq–Turkey border, the north, Iran to Iran–Iraq ...
. The oldest known Western armor is the
Dendra panoply, dating from the
Mycenaean Era around 1400 BC.
Mail
The mail or post is a system for physically transporting postcards, letter (message), letters, and parcel (package), parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid ...
, also referred to as chainmail, is made of interlocking iron rings, which may be riveted or welded shut. It is believed to have been invented by
Celt
The Celts (, see pronunciation for different usages) or Celtic peoples () are. "CELTS location: Greater Europe time period: Second millennium B.C.E. to present ancestry: Celtic a collection of Indo-European peoples. "The Celts, an ancien ...
ic people in Europe about 500 BC. Most cultures that used mail used the Celtic word or a variant, suggesting the Celts as the originators. The Romans widely adopted mail as the
lorica hamata, although they also made use of
lorica segmentata
The ''lorica segmentata'' (), also called ''lorica lamminata'' (see §Name), is a type of personal armour that was used by soldiers of the Roman army, consisting of metal strips fashioned into circular bands, fastened to internal leather stra ...
and
lorica squamata. While no non-metallic armor is known to have survived, it was likely to have been commonplace due to its lower cost.
Eastern armor has a long history, beginning in
Ancient China. In East Asian history laminated armor such as
lamellar
A ''lamella'' (plural ''lamellae'') is a small plate or flake, from the Latin, and may also be used to refer to collections of fine sheets of material held adjacent to one another, in a gill-shaped structure, often with fluid in between though s ...
, and styles similar to the
coat of plates, and
brigandine were commonly used. Later
cuirasses and plates were also used. In pre-Qin dynasty times, leather armor was made out of rhinoceros. The use of iron plate armor on the Korean peninsula was developed during the
Gaya Confederacy
Gaya (, ) was a Korean confederacy of territorial polities in the Nakdong River basin of southern Korea, growing out of the Byeonhan confederacy of the Samhan period.
The traditional period used by historians for Gaya chronology is AD 42–53 ...
of 42 CE - 562 CE. The iron was mined and refined in the area surrounding Gimhae (Gyeongsangnam Provence, South Korea). Using both vertical and triangular plate designs, the plate armor sets consisted of 27 or more individual 1-2mm thick curved plates, which were secured together by nail or hinge. The recovered sets include accessories such as iron arm guards, neck guards, leg guards, and horse armor/bits. The use of these armor types disappeared from use on the Korean Peninsula after the fall of the Gaya Confederacy to the Silla Dynasty, during the three kingdoms era
Three Kingdoms of Korea
Samhan or the Three Kingdoms of Korea () refers to the three kingdoms of Goguryeo (고구려, 高句麗), Baekje (백제, 百濟), and Silla (신라, 新羅). Goguryeo was later known as Goryeo (고려, 高麗), from which the modern name ''Kor ...
in 562 CE.
Middle Ages
In
European history
The history of Europe is traditionally divided into four time periods: prehistoric Europe (prior to about 800 BC), classical antiquity (800 BC to AD 500), the Middle Ages (AD 500 to AD 1500), and the modern era (since AD 1500).
The first earl ...
, well-known armor types include the
mail
The mail or post is a system for physically transporting postcards, letter (message), letters, and parcel (package), parcels. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid ...
hauberk of the early medieval age, and the full steel
plate harness worn by later
Medieval
In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire a ...
and
Renaissance
The Renaissance ( , ) , from , with the same meanings. is a period in European history marking the transition from the Middle Ages to modernity and covering the 15th and 16th centuries, characterized by an effort to revive and surpass id ...
knight
A knight is a person granted an honorary title of knighthood by a head of state (including the Pope) or representative for service to the monarch, the church or the country, especially in a military capacity. Knighthood finds origins in the G ...
s, and a few key components (breast and back plates) by heavy cavalry in several European countries until the first year of World War I (1914–15).
The
Japanese armor known today as
samurai
were the hereditary military nobility and officer caste of History of Japan#Medieval Japan (1185–1573/1600), medieval and Edo period, early-modern Japan from the late 12th century until their abolition in 1876. They were the well-paid retai ...
armor appeared in the
Heian period
The is the last division of classical Japanese history, running from 794 to 1185. It followed the Nara period, beginning when the 50th emperor, Emperor Kanmu, moved the capital of Japan to Heian-kyō (modern Kyoto). means "peace" in Japanese ...
. (794-1185) These early samurai armors are called the ''
ō-yoroi and ''
dō-maru''.
[式正の鎧・大鎧](_blank)
Costume Museum
Plate
Gradually, small additional plates or discs of iron were added to the mail to protect vulnerable areas. By the late 13th century, the knees were capped, and two circular discs, called
besagew
Besagews, also spelled besagues, are a type of rondel designed to protect the armpits, as part of a harness of plate armour. The armpits are the location of the axillary arteries, and protecting them was therefore vital. Armour without besagues ...
s were fitted to protect the underarms.
A variety of methods for improving the protection provided by mail were used as armorers seemingly experimented. Hardened leather and
splinted construction were used for arm and leg pieces. The
coat of plates was developed, an armor made of large plates sewn inside a textile or leather coat.
Early plate in Italy, and elsewhere in the 13th to 15th centuries were made of iron. Iron armor could be
carburized or
case hardened to give a surface of harder steel. Plate armor became cheaper than mail by the 15th century as it required much less labor and labor had become much more expensive after the
Black Death, though it did require larger furnaces to produce larger blooms. Mail continued to be used to protect those joints which could not be adequately protected by plate, such as the armpit, crook of the elbow and groin. Another advantage of plate was that a lance rest could be fitted to the breast plate.
The small skull cap evolved into a bigger true helmet, the
bascinet
The bascinet – also bassinet, basinet, or bazineto – was a Medieval European open-faced combat helmet. It evolved from a type of iron or steel skullcap, but had a more pointed apex to the skull, and it extended downwards at the rear an ...
, as it was lengthened downward to protect the back of the neck and the sides of the head. Additionally, several new forms of fully enclosed helmets were introduced in the late 14th century to replace the
great helm
The great helm or heaume, also called pot helm, bucket helm and barrel helm, is a helmet of the High Middle Ages which arose in the late twelfth century in the context of the Crusades and remained in use until the fourteenth century. The barreled ...
, such as the
sallet and
barbute and later the
armet and
close helm.
Probably the most recognized style of armor in the world became the
plate armor associated with the
knight
A knight is a person granted an honorary title of knighthood by a head of state (including the Pope) or representative for service to the monarch, the church or the country, especially in a military capacity. Knighthood finds origins in the G ...
s of the European
Late Middle Ages
The Late Middle Ages or Late Medieval Period was the period of European history lasting from AD 1300 to 1500. The Late Middle Ages followed the High Middle Ages and preceded the onset of the early modern period (and in much of Europe, the Ren ...
, but continuing to the early 17th-century
Age of Enlightenment
The Age of Enlightenment or the Enlightenment; german: Aufklärung, "Enlightenment"; it, L'Illuminismo, "Enlightenment"; pl, Oświecenie, "Enlightenment"; pt, Iluminismo, "Enlightenment"; es, La Ilustración, "Enlightenment" was an intel ...
in all European countries.
By about 1400 the full harness of plate armor had been developed in armories of Lombardy Heavy cavalry dominated the battlefield for centuries in part because of their armor.
In the early 15th century, small "
hand cannon" first began to be used, in the
Hussite Wars
The Hussite Wars, also called the Bohemian Wars or the Hussite Revolution, were a series of civil wars fought between the Hussites and the combined Catholic forces of Holy Roman Emperor Sigismund, the Papacy, European monarchs loyal to the ...
, in combination with
Wagenburg tactics, allowing infantry to defeat armored knights on the battlefield. At the same time
crossbow
A crossbow is a ranged weapon using an elastic launching device consisting of a bow-like assembly called a ''prod'', mounted horizontally on a main frame called a ''tiller'', which is hand-held in a similar fashion to the stock of a long fir ...
s were made more powerful to pierce armor, and the development of the Swiss
Pike square formation also created substantial problems for heavy cavalry. Rather than dooming the use of body armor, the threat of small firearms intensified the use and further refinement of plate armor. There was a 150-year period in which better and more metallurgically advanced steel armor was being used, precisely because of the danger posed by the gun. Hence, guns and cavalry in plate armor were "threat and remedy" together on the battlefield for almost 400 years. By the 15th-century, Italian armor plates were almost always made of steel. In Southern Germany armorers began to harden their steel armor only in the late 15th century. They would continue to harden their steel for the next century because they
quenched and
tempered their product which allowed for the
fire-gilding to be combined with tempering.
The quality of the metal used in armor deteriorated as armies became bigger and armor was made thicker, necessitating breeding of larger cavalry horses. If during the 14th and 15th centuries armor seldom weighed more than 15 kg, then by the late 16th century it weighed 25 kg. The increasing weight and thickness of late 16th-century armor therefore gave substantial resistance.
In the early years of pistol and
arquebuses, firearms were relatively low in velocity. The full suits of armor, or breast plates actually stopped bullets fired from a modest distance. The front breast plates were, in fact, commonly shot as a test. The impact point would often be encircled with engraving to point it out. This was called the "proof". Armor often also bore an insignia of the maker, especially if it was of good quality. Crossbow bolts, if still used, would seldom penetrate good plate, nor would any bullet unless fired from close range.
In effect, rather than making plate armor obsolete, the use of firearms stimulated the development of plate armor into its later stages. For most of that period, it allowed horsemen to fight while being the targets of defending arquebusiers without being easily killed. Full suits of armor were actually worn by generals and princely commanders right up to the 1710s.
Horse armor
The horse was afforded protection from lances and infantry weapons by steel plate
barding. This gave the horse protection and enhanced the visual impression of a mounted knight. Late in the era, elaborate barding was used in parade armor.
Gunpowder era
As
gunpowder
Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate ( saltpeter) ...
weapons improved, it became cheaper and more effective to have groups of unarmored men with early guns than to have expensive knights, which caused armor to be largely discarded. Most
light cavalry
Light cavalry comprised lightly armed and armored cavalry troops mounted on fast horses, as opposed to heavy cavalry, where the mounted riders (and sometimes the warhorses) were heavily armored. The purpose of light cavalry was primarily ...
units discarded armor, though heavy cavalry units continued to use it. Examples include the German
Reiter, Polish heavy
hussars
A hussar ( , ; hu, huszár, pl, husarz, sh, husar / ) was a member of a class of light cavalry, originating in Central Europe during the 15th and 16th centuries. The title and distinctive dress of these horsemen were subsequently widely ...
and the back and breast worn by heavy cavalry units during the Napoleonic wars.
Late modern use
Metal armor remained in limited use long after its general obsolescence. Soldiers in the
American Civil War
The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States. It was fought between the Union ("the North") and the Confederacy ("the South"), the latter formed by state ...
(1861–1865) bought iron and steel vests from peddlers (both sides had considered but rejected it for standard issue). The effectiveness of the vests varied widely—some successfully deflected bullets and saved lives but others were poorly made and resulted in tragedy for the soldiers. In any case the vests were abandoned by many soldiers due to their weight on long marches as well as the stigma they got for being cowards from their fellow troops.
At the start of
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was List of wars and anthropogenic disasters by death toll, one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, ...
in 1914, thousands of the French
Cuirassier
Cuirassiers (; ) were cavalry equipped with a cuirass, sword, and pistols. Cuirassiers first appeared in mid-to-late 16th century Europe as a result of armoured cavalry, such as men-at-arms and demi-lancers, discarding their lances and adopt ...
s rode out to engage the German Cavalry who likewise used helmets and armor. By that period, the shiny armor plate was covered in dark paint and a canvas wrap covered their elaborate Napoleonic-style helmets. Their armor was meant to protect only against
sabers and
lance
A lance is a spear designed to be used by a mounted warrior or cavalry soldier ( lancer). In ancient and medieval warfare, it evolved into the leading weapon in cavalry charges, and was unsuited for throwing or for repeated thrusting, unli ...
s. The cavalry had to beware of
rifles and
machine gun
A machine gun is a fully automatic, rifled autoloading firearm designed for sustained direct fire with rifle cartridges. Other automatic firearms such as automatic shotguns and automatic rifles (including assault rifles and battle rifl ...
s, like the infantry soldiers, who at least had a
trench
A trench is a type of excavation or in the ground that is generally deeper than it is wide (as opposed to a wider gully, or ditch), and narrow compared with its length (as opposed to a simple hole or pit).
In geology, trenches result from ero ...
to give them some protection.
By the end of the war the Germans had made some 400,000 ''Sappenpanzer'' suits. Too heavy and restrictive for infantry, most were worn by spotters, sentries, machine gunners and other troops who stayed in one place.
Modern non-metallic armor
Soldiers use metal or ceramic plates in their
bullet resistant vests, providing additional protection from
pistol
A pistol is a handgun, more specifically one with the chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in , when early handguns were produced in Europe, ...
and
rifle bullets. Metallic components or tightly woven fiber layers can give soft armor resistance to stab and slash attacks from
knives and
bayonets.
Chain mail
Chain mail (properly called mail or maille but usually called chain mail or chainmail) is a type of armour consisting of small metal rings linked together in a pattern to form a mesh. It was in common military use between the 3rd century BC and ...
armored gloves continue to be used by butchers and abattoir workers to prevent cuts and wounds while cutting up carcasses.
Ceramic
Boron carbide is used in hard plate armor capable of defeating rifle and armor piercing ammunition. It was used in armor plates like the
SAPI series, and today in most civilian accessible body armors.
Other materials include
boron suboxide,
alumina, and
silicon carbide
Silicon carbide (SiC), also known as carborundum (), is a hard chemical compound containing silicon and carbon. A semiconductor, it occurs in nature as the extremely rare mineral moissanite, but has been mass-produced as a powder and crystal ...
, which are used for varying reasons from protecting from tungsten carbide penetrators, to improved weight to area ratios. Ceramic body armor is made up of a hard and rigid ceramic strike face bonded to a ductile fiber composite backing layer. The projectile is shattered, turned, or eroded as it impacts the ceramic strike face, and much of its kinetic energy is consumed as it interacts with the ceramic layer; the fiber composite backing layer absorbs residual kinetic energy and catches bullet and ceramic debris. This allows such armor to defeat armor-piercing 5.56×45mm, 7.62×51mm, and 7.62x39mm bullets, among others, with little or no felt blunt trauma. High-end ceramic armor plates typically utilize
ultra-high-molecular-weight polyethylene fiber composite backing layers, whereas budget plates will utilize
aramid
Aramid fibers, short for aromatic polyamide, are a class of heat-resistant and strong synthetic fibers. They are used in aerospace and military applications, for ballistic-rated body armor fabric and ballistic composites, in marine cordage, mar ...
or
fiberglass
Fiberglass (American English) or fibreglass (Commonwealth English) is a common type of fiber-reinforced plastic using glass fiber. The fibers may be randomly arranged, flattened into a sheet called a chopped strand mat, or woven into glass cl ...
.
Fibers
DuPont
Kevlar
Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s ...
is well known as a component of some bullet resistant vests and
bullet resistant face masks. The
PASGT helmet and vest used by
United States
The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 U.S. state, states, a Washington, D.C., federal district, five ma ...
military forces since the early 1980s both have Kevlar as a key component, as do their replacements. Civilian applications include Kevlar reinforced clothing for motorcycle riders to protect against abrasion injuries. Kevlar in non-woven long strand form is used inside an outer protective cover to form chaps that loggers use while operating a chainsaw. If the moving chain contacts and tears through the outer cover, the long fibers of Kevlar tangle, clog, and stop the chain from moving as they get drawn into the workings of the drive mechanism of the saw. Kevlar is used also in emergency services protection gear if it involves high heat, ''e.g.'', tackling a fire, and Kevlar such as vests for police officers, security, and
SWAT
In the United States, a SWAT team (special weapons and tactics, originally special weapons assault team) is a police tactical unit that uses specialized or military equipment and tactics. Although they were first created in the 1960s to ...
. The latest Kevlar material that DuPont has developed is Kevlar XP. In comparison with "normal" Kevlar, Kevlar XP is more lightweight and more comfortable to wear, as its quilt stitch is not required for the ballistic package.
Twaron is similar to Kevlar. They both belong to the aramid family of synthetic fibers. The only difference is that Twaron was first developed by Akzo in the 1970s. Twaron was first commercially produced in 1986. Now, Twaron is manufactured by
Teijin Aramid. Like Kevlar, Twaron is a strong, synthetic fiber. It is also heat resistant and has many applications. It can be used in the production of several materials that include the military, construction, automotive, aerospace, and even sports market sectors. Among the examples of Twaron-made materials are body armor, helmets, ballistic vests, speaker woofers, drumheads, tires, turbo hoses, wire ropes, and cables.
Another fiber used to manufacture a bullet-resistant vest is Dyneema
ultra-high-molecular-weight polyethylene. Originated in the Netherlands, Dyneema has an extremely high strength-to-weight ratio (a 1-mm-diameter rope of Dyneema can bear up to a 240-kg load), is light enough (low density) that it can float on water, and has high energy absorption characteristics. Since the introduction of the Dyneema Force Multiplier Technology in 2013, many body armor manufacturers have switched to Dyneema for their high-end armor solutions.
Protected areas
Shield
A
shield
A shield is a piece of personal armour held in the hand, which may or may not be strapped to the wrist or forearm. Shields are used to intercept specific attacks, whether from close-ranged weaponry or projectiles such as arrows, by means of ...
is held in the hand or arm. Its purpose is to intercept attacks, either by stopping projectiles such as arrows or by glancing a blow to the side of the shield-user, and it can also be used offensively as a bludgeoning weapon. Shields vary greatly in size, ranging from large shields that protect the user's entire body to small shields that are mostly for use in hand-to-hand combat. Shields also vary a great deal in thickness; whereas some shields were made of thick wooden planking, to protect soldiers from spears and crossbow bolts, other shields were thinner and designed mainly for glancing blows away (such as a sword blow). In prehistory, shields were made of wood, animal hide, or wicker. In antiquity and in the Middle Ages, shields were used by foot soldiers and mounted soldiers. Even after the invention of gunpowder and firearms, shields continued to be used. In the 18th century, Scottish clans continued to use small shields, and in the 19th century, some non-industrialized peoples continued to use shields. In the 20th and 21st centuries,
ballistic shields
Ballistic shields, also called tactical shields or bulletproof shields, are protection devices deployed by police, paramilitaries, and armed forces that are designed to stop or deflect bullets and other projectiles fired at their carrier. Ballisti ...
are used by military and police units that specialize in anti-terrorist action,
hostage rescue, and siege-breaching.
Head
A
combat helmet
A combat helmet or battle helmet is a type of helmet. It is a piece of personal armor designed specifically to protect the head during combat. Modern combat helmets are mainly designed to protect from shrapnel and fragments, offer some pro ...
is among the oldest forms of
personal protective equipment
Personal protective equipment (PPE) is protective clothing, helmets, goggles, or other garments or equipment designed to protect the wearer's body from injury or infection. The hazards addressed by protective equipment include physical, ...
, and is known to have been worn in
ancient India
According to consensus in modern genetics, anatomically modern humans first arrived on the Indian subcontinent from Africa between 73,000 and 55,000 years ago. Quote: "Y-Chromosome and Mt-DNA data support the colonization of South Asia by ...
around 1700 BC and the
Assyrians
Assyrian may refer to:
* Assyrian people, the indigenous ethnic group of Mesopotamia.
* Assyria, a major Mesopotamian kingdom and empire.
** Early Assyrian Period
** Old Assyrian Period
** Middle Assyrian Empire
** Neo-Assyrian Empire
* Assyrian ...
around 900 BC, followed by the
ancient Greeks
Ancient Greece ( el, Ἑλλάς, Hellás) was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity ( AD 600), that comprised a loose collection of cult ...
and
Romans, throughout the
Middle Ages
In the history of Europe, the Middle Ages or medieval period lasted approximately from the late 5th to the late 15th centuries, similar to the post-classical period of global history. It began with the fall of the Western Roman Empire ...
, and up to the modern era.
Their materials and construction became more advanced as weapons became more and more powerful. Initially constructed from
leather
Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and ho ...
and
brass
Brass is an alloy of copper (Cu) and zinc (Zn), in proportions which can be varied to achieve different mechanical, electrical, and chemical properties. It is a substitutional alloy: atoms of the two constituents may replace each other wit ...
, and then
bronze and
iron
Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in ...
during the
Bronze and
Iron
Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in ...
Ages, they soon came to be made entirely from forged
steel in many societies after about AD 950. At that time, they were purely military equipment, protecting the head from cutting blows with
sword
A sword is an edged, bladed weapon intended for manual cutting or thrusting. Its blade, longer than a knife or dagger, is attached to a hilt and can be straight or curved. A thrusting sword tends to have a straighter blade with a pointed t ...
s, flying
arrow
An arrow is a fin-stabilized projectile launched by a bow. A typical arrow usually consists of a long, stiff, straight shaft with a weighty (and usually sharp and pointed) arrowhead attached to the front end, multiple fin-like stabilizers ...
s, and low-velocity
musket
A musket is a muzzle-loaded long gun that appeared as a smoothbore weapon in the early 16th century, at first as a heavier variant of the arquebus, capable of penetrating plate armour. By the mid-16th century, this type of musket graduall ...
ry. Some late medieval helmets, like the
great bascinet, rested on the shoulders and prevented the wearer from turning his head, greatly restricting mobility. During the 18th and 19th centuries, helmets were not widely used in warfare; instead, many armies used unarmored hats that offered no protection against blade or bullet. The arrival of World War I, with its trench warfare and wide use of artillery, led to mass adoption of metal helmets once again, this time with a shape that offered mobility, a low profile, and compatibility with gas masks. Today's militaries often use high-quality helmets made of ballistic materials such as
Kevlar
Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s ...
and
Twaron, which have excellent bullet and fragmentation stopping power. Some helmets also have good non-ballistic protective qualities, though many do not. The two most popular ballistic helmet models are the PASGT and the MICH. The
Modular Integrated Communications Helmet (MICH) type helmet has a slightly smaller coverage at the sides which allows tactical headsets and other communication equipment. The MICH model has standard pad suspension and four-point chinstrap. The Personal Armor System for Ground Troops (PASGT) helmet has been in use since 1983 and has slowly been replaced by the MICH helmet.
A
ballistic face mask is designed to protect the wearer from ballistic threats. Ballistic face masks are usually made of kevlar or other bullet-resistant materials and the inside of the mask may be padded for shock absorption, depending on the design. Due to weight restrictions, protection levels range only up to
NIJ Level IIIA.
Torso
A
ballistic vest helps absorb the impact from
firearm-fired
projectiles and
shrapnel
Shrapnel may refer to:
Military
* Shrapnel shell, explosive artillery munitions, generally for anti-personnel use
* Shrapnel (fragment), a hard loose material
Popular culture
* ''Shrapnel'' (Radical Comics)
* ''Shrapnel'', a game by Adam ...
from explosions, and is worn on the
torso
The torso or trunk is an anatomical term for the central part, or the core, of the body of many animals (including humans), from which the head, neck
The neck is the part of the body on many vertebrates that connects the head with the tors ...
. Soft vests are made from many layers of woven or laminated fibers and can be capable of protecting the wearer from small caliber
handgun
A handgun is a short- barrelled gun, typically a firearm, that is designed to be usable with only one hand. It is distinguished from a long gun (i.e. rifle, shotgun or machine gun, etc.), which needs to be held by both hands and also brac ...
and
shotgun
A shotgun (also known as a scattergun, or historically as a fowling piece) is a long-barreled firearm designed to shoot a straight-walled cartridge known as a shotshell, which usually discharges numerous small pellet-like spherical sub- p ...
projectiles, and small fragments from explosives such as
hand grenade
A grenade is an explosive weapon typically thrown by hand (also called hand grenade), but can also refer to a Shell (projectile), shell (explosive projectile) shot from the muzzle of a rifle (as a rifle grenade) or a grenade launcher. A modern ...
s.
Metal or ceramic plates can be used with a soft vest, providing additional protection from
rifle rounds, and metallic components or tightly woven fiber layers can give soft armor resistance to stab and slash attacks from a
knife
A knife ( : knives; from Old Norse 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evide ...
or
bayonet. Soft vests are commonly worn by
police
The police are a constituted body of persons empowered by a state, with the aim to enforce the law, to ensure the safety, health and possessions of citizens, and to prevent crime and civil disorder. Their lawful powers include arrest a ...
forces, private citizens and private
security guard
A security guard (also known as a security inspector, security officer, or protective agent) is a person employed by a government or private party to protect the employing party's assets (property, people, equipment, money, etc.) from a variety ...
s or
bodyguard
A bodyguard (or close protection officer/operative) is a type of security guard, government law enforcement officer, or servicemember who protects a person or a group of people — usually witnesses, high-ranking public officials or officers ...
s, whereas hard-plate reinforced vests are mainly worn by combat soldiers, police tactical units and hostage rescue teams.
A modern equivalent may combine a ballistic vest with other items of protective clothing, such as a
combat helmet
A combat helmet or battle helmet is a type of helmet. It is a piece of personal armor designed specifically to protect the head during combat. Modern combat helmets are mainly designed to protect from shrapnel and fragments, offer some pro ...
. Vests intended for police and military use may also include ballistic shoulder and side protection armor components, and explosive ordnance disposal technicians wear heavy armor and helmets with face visors and spine protection.
Limbs
Medieval armor often offered protection for all of the
limbs, including metal boots for the lower legs, gauntlets for the hands and wrists, and greaves for the legs. Today, protection of limbs from bombs is provided by a
bombsuit. Most modern soldiers sacrifice limb protection for mobility, since armor thick enough to stop bullets would greatly inhibit movement of the arms and legs.
Performance standards
Due to the various different types of projectiles, it is often inaccurate to refer to a particular product as "
bulletproof" because this suggests that it will protect against any and all projectiles. Instead, the term bullet resistant is generally preferred.
Standards are regional. Around the world ammunition varies and armor testing must reflect the threats found locally.
While many standards exist, a few standards are widely used as models. The US
National Institute of Justice
The National Institute of Justice (NIJ) is the research, development and evaluation agency of the United States Department of Justice. NIJ, along with the Bureau of Justice Statistics (BJS), Bureau of Justice Assistance (BJA), Office of Juven ...
ballistic and stab documents are examples of broadly accepted standards. In addition to the NIJ, the United Kingdom's Home Office Scientific Development Branch (HOSDB—formerly the Police Scientific Development Branch (PSDB)) standards are also used by a number of other countries and organizations. These "model" standards are usually adapted by other countries by following the same basic test methodologies, while changing the specific ammunition tested. NIJ Standard-0101.06 has specific performance standards for bullet resistant vests used by law enforcement. This rates vests on the following scale against penetration and also blunt trauma protection (deformation):
In 2018 or 2019, NIJ was expected to introduce the new NIJ Standard-0101.07. This new standard will completely replace the NIJ Standard-0101.06. The current system of using Roman numerals (II, IIIA, III, and IV) to indicate the level of threat will disappear and be replaced by a naming convention similar to the standard developed by UK Home Office Scientific Development Branch. HG (Hand Gun) is for soft armor and RF (Rifle) is for hard armor. Another important change is that the test-round velocity for conditioned armor will be the same as that for new armor during testing. For example, for NIJ Standard-0101.06 Level IIIA the .44 Magnum round is currently shot at 408 m/s for conditioned armor and at 436 m/s for new armor. For the NIJ Standard-0101.07, the velocity for both conditioned and new armor will be the same.
In January 2012, the NIJ introduced
BA 9000, body armor quality management system requirements as a quality standard not unlike
ISO 9001
The ISO 9000 family is a set of five quality management systems (QMS) standards that help organizations ensure they meet customer and other stakeholder needs within statutory and regulatory requirements related to a product or service. ISO ...
(and much of the standards were based on ISO 9001).
In addition to the NIJ and HOSDB standards, other important standards include: the
German Police's Technische Richtlinie (TR) Ballistische Schutzwesten, Draft
ISO prEN ISO 14876, and
Underwriters Laboratories
The UL enterprise is a global safety science company headquartered in Northbrook, Illinois, composed of three organizations, UL Research Institutes, UL Standards & Engagement and UL Solutions.
Established in 1894, the UL enterprise was founded as ...
(UL Standard 752).
Textile armor is tested for both penetration resistance by bullets and for the impact energy transmitted to the wearer. The "backface signature" or transmitted impact energy is measured by shooting armor mounted in front of a backing material, typically oil-based
modelling clay. The clay is used at a controlled temperature and verified for impact flow before testing. After the armor is impacted with the test bullet the vest is removed from the clay and the depth of the indentation in the clay is measured.
The backface signature allowed by different test standards can be difficult to compare. Both the clay materials and the bullets used for the test are not common. In general the British, German and other European standards allow 20–25 mm of backface signature, while the US-NIJ standards allow for 44 mm, which can potentially cause internal injury. The allowable backface signature for this has been controversial from its introduction in the first NIJ test standard and the debate as to the relative importance of penetration-resistance vs. backface signature continues in the medical and testing communities.
In general a vest's textile material temporarily degrades when wet. Neutral water at room temp does not affect para-aramid or
UHMWPE
Ultra-high-molecular-weight polyethylene (UHMWPE, UHMW) is a subset of the thermoplastic polyethylene. Also known as high-modulus polyethylene, (HMPE), it has extremely long chains, with a molecular mass usually between 3.5 and 7.5 million amu. T ...
but acidic, basic and some other solutions can permanently reduce para-aramid fiber tensile strength. (As a result of this, the major test standards call for wet testing of textile armor.) Mechanisms for this wet loss of performance are not known. Vests that will be tested after ISO-type water immersion tend to have heat-sealed enclosures and those that are tested under NIJ-type water spray methods tend to have water-resistant enclosures.
From 2003 to 2005, a large study of the environmental degradation of Zylon armor was undertaken by the US-NIJ. This concluded that water, long-term use, and temperature exposure significantly affect tensile strength and the ballistic performance of PBO or Zylon fiber. This NIJ study on vests returned from the field demonstrated that environmental effects on Zylon resulted in ballistic failures under standard test conditions.
Ballistic testing V50 and V0
Measuring the ballistic performance of armor is based on determining the
kinetic energy
In physics, the kinetic energy of an object is the energy that it possesses due to its motion.
It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its a ...
of a bullet at impact. Because the energy of a bullet is a key factor in its penetrating capacity, velocity is used as the primary independent variable in ballistic testing. For most users the key measurement is the velocity at which no bullets will penetrate the armor. Measuring this zero penetration velocity (V0) must take into account variability in armor performance and test variability. Ballistic testing has a number of sources of variability: the armor, test backing materials, bullet, casing, powder, primer and the gun barrel, to name a few.
Variability reduces the predictive power of a determination of V0. If, for example, the V0 of an armor design is measured to be with a 9 mm FMJ bullet based on 30 shots, the test is only an estimate of the real V0 of this armor. The problem is variability. If the V0 is tested again with a second group of 30 shots on the same vest design, the result will not be identical.
Only a single low velocity penetrating shot is required to reduce the V0 value. The more shots made the lower the V0 will go. In terms of statistics, the zero penetration velocity is the tail end of the distribution curve. If the variability is known and the standard deviation can be calculated, one can rigorously set the V0 at a confidence interval. Test Standards now define how many shots must be used to estimate a V0 for the armor certification. This procedure defines a confidence interval of an estimate of V0. (See "NIJ and HOSDB test methods".)
V0 is difficult to measure, so a second concept has been developed in ballistic testing called V50. This is the velocity at which 50 percent of the shots go through and 50 percent are stopped by the armor. US military standards define a commonly used procedure for this test. The goal is to get three shots that penetrate and a second group of three shots that are stopped by the armor all within a specified velocity range. It is possible, and desirable, to have a penetration velocity lower than a stop velocity. These three stops and three penetrations can then be used to calculate a V50 velocity.
In practice this measurement of V50 often requires 1–2 vest panels and 10–20 shots. A very useful concept in armor testing is the offset velocity between the V0 and V50. If this offset has been measured for an armor design, then V50 data can be used to measure and estimate changes in V0. For vest manufacturing, field evaluation and life testing both V0 and V50 are used. However, as a result of the simplicity of making V50 measurements, this method is more important for control of armor after certification.
Cunniff analysis
Using dimensionless analysis, Cuniff arrived at a relation connecting the V
50 and the system parameters for textile-based body armors. Under the assumption that the energy of impact is dissipated in breaking the yarn, it was shown that
:
Here,
:
:
are the failure stress, failure strain, density and elastic modulus of the yarn
:
is the mass per unit area of the armor
:
is the mass per unit area of the projectile
Military testing
After the
Vietnam War
The Vietnam War (also known by #Names, other names) was a conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. It was the second of the Indochina Wars and was officially fought between North Vie ...
, military planners developed a concept of "Casualty Reduction". The large body of casualty data made clear that in a combat situation, fragments, not bullets, were the greatest threat to soldiers. After
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the World War II by country, vast majority of the world's countries—including all of the great power ...
vests were being developed and fragment testing was in its early stages. Artillery shells, mortar shells, aerial bombs, grenades, and antipersonnel mines are fragmentation devices. They all contain a steel casing that is designed to burst into small steel fragments or shrapnel, when their explosive core detonates. After considerable effort measuring fragment size distribution from various
NATO
The North Atlantic Treaty Organization (NATO, ; french: Organisation du traité de l'Atlantique nord, ), also called the North Atlantic Alliance, is an intergovernmental military alliance between 30 member states – 28 European and two No ...
and
Soviet Bloc
The Eastern Bloc, also known as the Communist Bloc and the Soviet Bloc, was the group of socialist states of Central and Eastern Europe, East Asia, Southeast Asia, Africa, and Latin America under the influence of the Soviet Union that existed du ...
munitions, a fragment test was developed. Fragment simulators were designed and the most common shape is a Right Circular Cylinder or RCC simulator. This shape has a length equal to its diameter. These RCC Fragment Simulation Projectiles (FSPs) are tested as a group. The test series most often includes , , , and mass RCC FSP testing. The 2-4-16-64 series is based on the measured fragment size distributions.
The second part of "Casualty Reduction" strategy is a study of velocity distributions of fragments from munitions. Warhead explosives have blast speeds of to . As a result, they are capable of ejecting fragments at speeds of over , implying very high energy (where the energy of a fragment is mass × velocity
2, neglecting rotational energy). The military engineering data showed that, like the fragment size, the fragment velocities had characteristic distributions. It is possible to segment the fragment output from a warhead into velocity groups. For example, 95% of all fragments from a bomb blast under have a velocity of or less. This established a set of goals for military ballistic vest design.
The random nature of fragmentation required the military vest specification to trade off mass vs. ballistic-benefit. Hard vehicle armor is capable of stopping all fragments, but military personnel can only carry a limited amount of gear and equipment, so the weight of the vest is a limiting factor in vest fragment protection. The 2-4-16-64 grain series at limited velocity can be stopped by an all-textile vest of approximately 5.4 kg/m
2 (1.1 lb/ft
2). In contrast to deformable lead bullets, fragments do not change shape; they are steel and can not be deformed by textile materials. The FSP (the smallest fragment projectile commonly used in testing) is about the size of a grain of rice; such small, fast-moving fragments can potentially slip through the vest, moving between yarns. As a result, fabrics optimized for fragment protection are tightly woven, although these fabrics are not as effective at stopping lead bullets.
By the 2010s, the development of body armor had been stymied in regards to weight, in that designers had trouble increasing the protective capability of body armor while still maintaining or decreasing its weight.
See also
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International Medieval Combat Federation
The International Medieval Combat Federation is a global historical full contact sport fighting revival movement, in which combatants use historically accurate reproduction medieval and early modern armour and blunted weapons to engage in compet ...
*
Liquid Armor
*
Osprey body armor
Notes
References
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External links
Museum Syndicate: Armor
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