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Personal Armor

History

Greek Mycenaean 1400 BC armor.

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 plate armor first appeared in Medieval Europe when water-powered trip hammers made the formation of plates faster and cheaper. Also modern militaries usually do not provide the best armor to their forces since doing so would be prohibitively costly. 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

In European history, well-known armor types include the lorica hamata and the lorica segmentata of the Roman legions, the mail hauberk of the early medieval age, and the full steel plate harness worn by later Medieval and Renaissance knights, and a few key components (breast and back plates) by heavy cavalry in several European countries until the first year of World War I (191415).

In November 2006 it was announced in Greece that the oldest surviving armor in Greece was restored and will be put on display soon (see picture). The armor dates from the Mycenaean Era around 1400 BC and is referred to as the Dendra panoply.[citation needed]

In East Asian history laminated armor such as lamellar, 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. Chinese influence in Japan would result in the Japanese adopting Chinese styles, their samurai armor being a result of this influence.

Middle Ages

Turkish plated mail

Mail

Main article: Mail (armour)

Mail, sometimes called by the neologism "chainmail", is made of interlocking iron rings, which may be riveted or welded shut. It is believed to have been invented by the Celtic people in Eastern Europe about 500 BC.[citation needed] When these Celts moved West they took mail with them. Most cultures who used mail used the Celtic word Byrnne or a variant, suggesting the Celts as the originators.[citation needed]

Plate

Main article: Plate armour

Further information: components of medieval armour

Gradually, small additional plates or discs of iron were added to the mail to protect vulnerable areas. By the late 1200s, the knees were capped, and two circular discs, called besagews were fitted to protect the underarms. A variety of methods for improving the protection provided by mail were used as armorers seemingly experimented.[citation needed] 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 13th15th century 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, 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 1300s to replace the great helm, such as the salletand 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 knights of the European Late Middle Ages, but continuing to the early 17th century Age of Enlightenment 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, in combination with Wagenburg tactics, allowing infantry to defeat armored knights on the battlefield. At the same time crossbows 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 1415th centuries armor seldom weighed more than 15kgs, than 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 arquebuseers without being easily killed. Full suits of armor were actually worn by generals and princely commanders right up to the second decade of the 18th century. It was the only way they could be mounted and survey the overall battlefield with safety from distant musket fire.

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.

Early modern

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World War I German Stahlhelm and prototype anti-shrapnel armor.

Gradually starting in the mid 16th century, one plate element after another was discarded to save weight for foot soldiers.

Back and breast plates continued to be used throughout the entire period of the 18th century and through Napoleonic times, in many European (heavy) cavalry units, until the early 20th century. From their introduction, muskets could pierce plate armor, so cavalry had to be far more mindful of the fire.

Late modern

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Though the age of the knight was over, armor continued to be used in many capacities. Soldiers in the American Civil War bought iron and steel vests from peddlers (both sides had considered but rejected body armor 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, thousands of the French Cuirassiers 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 sabres and light lances. The cavalry had to beware of high velocity rifles and machine guns like the foot soldiers, who at least had a trench to protect them.

Material

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.

Fibers

Kevlar 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 military forces since the early 1980s both have Kevlar as a key component, as do their replacements. Other military uses include bulletproof facemasks used by sentries. 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 Service's protection gear if it involves high heat (e.g., tackling a fire), and Kevlar body armor such as vests for police officers, security, and SWAT.

Protected areas

Main article: List of personal protective equipment by body area

General

U.S. police officer with a riot shield.

A shield is held in the hand/arm. It's purpose is to intercept attacks, either by stopping projectiles such as arrows or by glancing a blow to the side of the shield-user. 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 footsoldiers 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 century, shields are used by military and police units that specialize in anti-terrorist action, hostage rescue, and siege-breaching.

Torso

Ballistic vest.

A ballistic vest helps absorb the impact from firearm-fired projectiles and shrapnel from explosions, and is worn on the torso. Soft vests are made from many layers of woven or laminated fibers and can be capable of protecting the wearer from small caliber handgun and shotgun projectiles, and small fragments from explosives such as hand grenades.

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. Soft vests are commonly worn by police forces, private citizens and private security guards or bodyguards, whereas hard-plate reinforced vests are mainly worn by combat soldiers, police tactical units and hostage rescue teams.

Modern body armor may combine a ballistic vest with other items of protective clothing, such as a combat helmet. Vests intended for police and military use may also include ballistic shoulder and side protection armor components, and bomb disposal officers wear heavy armor and helmets with face visors and spine protection.

Head

A U.S. soldier wearing a combat helmet.

A combat helmet are among the oldest forms of personal protective equipment, and are known to have been worn by the Assyrians around 900BC, followed by the ancient Greeks and Romans, throughout the Middle Ages, and up to the end of the 1600s by many combatants. Their materials and construction became more advanced as weapons became more and more powerful. Initially constructed from leather and brass, and then bronze and iron during the Bronze and Iron Ages, they soon came to be made entirely from forged steel in many societies after about 950AD. At that time, they were purely military equipment, protecting the head from cutting blows with swords, flying arrows, and low-velocity musketry. Many medieval helmets rested on the shoulders and prevented the wearer from turning his or her head, greatly restricting mobility. During the 18th and 19th centuries, helmets were not widely used in warfare, instead many armies used non-armored 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 and Aramid, which have excellent bullet and fragmentation stopping power. Some helmets also have good non-ballistic protective qualities, though many do not. Non-ballistic injuries may be caused by many things, such as concussive shockwaves from explosions, physical attacks, motor vehicle accidents, or falls.

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.

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 projectile, it is often inaccurate to refer to a particular product as "bulletproof" because this implies that it will protect against any and all threats. Instead, the term bullet resistant is generally preferred.

Body armor standards are regional. Around the world ammunition varies and as a result the armor testing must reflect the threats found locally. Law enforcement statistics show that many shootings where officers are injured or killed involve the officer's weapon[citation needed]. As a result each law enforcement agency or para-military organizations will have their own standard for armor performance if only to ensure that their armor protects them from their own weapon. While many standards exist a few standards are widely used as models. The US National Institute of Justice ballistic and stab documents are examples of broadly accepted standards. In addition to the NIJ, the UK Home Office Scientific Development Branch (HOSDB - formerly the Police Scientific Development Branch (PSDB)) standards are used by a number of other countries and organizations. These "model" standards are usually adapted by other counties by incorporation of the basic test methodologies with modification of the bullets that are required for test. 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):

Armor Level (Higher is better)

Protection

Type I

(.22 LR; .380 ACP)

This armor would protect against 2.6 g (40 gr) .22 Long Rifle Lead Round Nose (LR LRN) bullets at a velocity of 329 m/s (1080 ft/s 30 ft/s) and 6.2 g (95 gr) .380 ACP Full Metal Jacketed Round Nose (FMJ RN) bullets at a velocity of 322 m/s (1055 ft/s 30 ft/s). It is no longer part of the standard.

Type IIA

(9 mm; .40 S&W)

New armor protects against 8 g (124 gr) 9x19mm Parabellum Full Metal Jacketed Round Nose (FMJ RN) bullets at a velocity of 373 m/s 9.1 m/s (1225 ft/s 30 ft/s) and 11.7 g (180 gr) .40 S&W Full Metal Jacketed (FMJ) bullets at a velocity of 352 m/s 9.1 m/s (1155 ft/s 30 ft/s). Conditioned armor protects against 8 g (124 gr) 9 mm FMJ RN bullets at a velocity of 355 m/s 9.1 m/s (1165 ft/s 30 ft/s) and 11.7 g (180 gr) .40 S&W FMJ bullets at a velocity of 325 m/s 9.1 m/s (1065 ft/s 30 ft/s). It also provides protection against the threats mentioned in [Type I].

Type II

(9 mm; .357 Magnum)

New armor protects against 8 g (124 gr) 9 mm FMJ RN bullets at a velocity of 398 m/s 9.1 m/s (1305 ft/s 30 ft/s) and 10.2 g (158 gr) .357 Magnum Jacketed Soft Point bullets at a velocity of 436 m/s 9.1 m/s (1430 ft/s 30 ft/s). Conditioned armor protects against 8 g (124 gr) 9 mm FMJ RN bullets at a velocity of 379 m/s 9.1 m/s (1245 ft/s 30 ft/s) and 10.2 g (158 gr) .357 Magnum Jacketed Soft Point bullets at a velocity of 408 m/s 9.1 m/s (1340 ft/s 30 ft/s). It also provides protection against the threats mentioned in [Types I and IIA].

Type IIIA

(.357 SIG; .44 Magnum)

New armor protects against 8.1 g (125 gr) .357 SIG FMJ Flat Nose (FN) bullets at a velocity of 448 m/s 9.1 m/s (1470 ft/s 30 ft/s) and 15.6 g (240 gr) .44 Magnum Semi Jacketed Hollow Point (SJHP) bullets at a velocity of 436 m/s (1430 ft/s 30 ft/s). Conditioned armor protects against 8.1 g (125 gr) .357 SIG FMJ Flat Nose (FN) bullets at a velocity of 430 m/s 9.1 m/s (1410 ft/s 30 ft/s) and 15.6 g (240 gr) .44 Magnum Semi Jacketed Hollow Point (SJHP) bullets at a velocity of 408 m/s 9.1 m/s (1340 ft/s 30 ft/s). It also provides protection against most handgun threats, as well as the threats mentioned in [Types I, IIA, and II].

Type III

(Rifles)

Conditioned armor protects against 9.6 g (148 gr) 7.62x51mm NATO M80 ball bullets at a velocity of 847 m/s 9.1 m/s (2780 ft/s 30 ft/s). It also provides protection against the threats mentioned in [Types I, IIA, II, and IIIA].

Type IV

(Armor Piercing Rifle)

Conditioned armor protects against 10.8 g (166 gr) .30-06 Springfield M2 armor piercing (AP) bullets at a velocity of 878 m/s 9.1 m/s (2880 ft/s 30 ft/s). It also provides at least single hit protection against the threats mentioned in [Types I, IIA, II, IIIA, and III].

In addition to the NIJ and HOSDB standards, other important standards include: German Police TR-Technische Richtlinie, Draft ISO prEN ISO 14876, Underwriters Laboratories (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 2025 mm of backface signature, while the US-NIJ standards allow for 44 mm, which can potentially cause internal injury. The allowable backface signature for body armor 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 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 affects 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 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 1,600 ft/s (490 m/s) 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 that are slower than a second group of three shots that are stopped by the armor. These three high stops and three low penetrations can then be used to calculate a V50 velocity.

In practice this measurement of V50 requires 12 vest panels and 1020 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.

Military testing

After the Vietnam War, military planners developed a concept of asualty Reduction18]. The large body of casualty data made clear that in a combat situation, fragments, not bullets, were the most important threat to soldiers. After WWII vests were being developed and fragment testing was in its early stages. Artillery shells, mortar shells, aerial bombs, grenades, and antipersonnel mines are all 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 and Soviet bloc 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 2 grain (0.13 g), 4 grain (0.263 g), 16 grain (1.0 g), and 64 grain (4.2 g) mass RCC FSP testing. The 2-4-16-64 series is based on the measured fragment size distributions.

The second part of asualty Reduction strategy is a study of velocity distributions of fragments from munitions. Warhead explosives have blast speeds of 20,000 ft/s (6,100 m/s) to 30,000 ft/s (9,100 m/s). As a result they are capable of ejecting fragments at very high speeds of over 1000m/s (3330 ft/s), implying very high energy (where the energy of a fragment is mass velocity2, 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 4 grains (0.26 g) have a velocity of 3,000 ft/s (910 m/s) 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/m2 (1.1 lb/ft2). In contrast to the design of vest for deformable lead bullets, fragments do not change shape; they are steel and can not be deformed by textile materials. The 2-grain (0.13 g) 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.

Practice

In December 2009, a British soldier deployed in southern Helmand, Afghanistan, survived a shot in his back during an operation to clear insurgents from a village, thanks to the body armor he was wearing. Lance Sergeant Daniel Collins survivor's account and gratitude pictures its usefulness: "(...) I was hit in the back by a single shot. It must have been from about 2-300 metres away. The round knocked me down in an instant, it felt like being hit by a sledge-hammer at full swing. I slammed into the dirt face down. (...) I was in agony, I certainly couldn't walk on my own (...) I think it was a 7.62mm round. That's a high calibre bullet to be hit by, but it shows you that the body armour works. I wouldn't be sitting here now telling you this story, if I wasn't wearing one. Thank you to whoever designed the body armour. If I ever meet them, I'd like to buy them a pint" .

References

^ Williams, pp.7401.

^ Williams, p.55

^ Williams, p.53

^ Williams, p.66

^ Williams, p.331

^ Williams, p.916

^ Stewart, pp.74-5

^ http://www.nps.gov/archive/colo/Jthanout/HisArmur.html

^ Galea - About the Galea

^ Kevlar Pasgt Helmet

^ http://www.operation-helmet.org

^ a b "Ballistic Resistance of Body Armor NIJ Standard-0101.06" (PDF). NIJ Standards. United States Department of Justice. July 2008. http://www.ncjrs.gov/pdffiles1/nij/223054.pdf. Retrieved 2008-11-13. 

^ Wilhelm, M; Bir, C (2008). "Injuries to law enforcement officers: The backface signature injury". Forensic Science International 174 (1): 611. ISSN 0379-0738. http://cat.inist.fr/?aModele=afficheN&cpsidt=19964046. 

^ Kevlar, Twaron, Dyneema, Spectra technical data

^ NIJ, HOSDB, US-Army and ISO ballistic test methods

^ "Third Status Report to the Attorney General on Body Armor Safety Initiative Testing and Activities"

^ ARMY MIL-STD-662F V50 BALLISTIC TEST FOR ARMOR

^ Dusablon, L V (December 1972). The Casualty Reduction Analysis Model for Personnel Armor Systems. U.S. Army Natick Research, Development and Engineering Center. 

^ Design Information for Construction of Light Personnel Armor. Authors: Willard R. Beye 1950 MIDWEST RESEARCH INST KANSAS CITY MO

^ Johnson, W., Collins, C., and Kindred, F., A Mathematical Model for Predicting Residual Velocities of Fragments After Perforating Helmets and Body Armor, Ballistic Research Laboratories Technical Note no. 1705, October 1968

^ "Welsh Guard shot in the back is saved by his body armour"

External links

Gallery of Armor Examples

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