Analysis of composite materials based on polyethylene fibres for protective clothes

Risteski, Sanja and Srebrenkoska, Vineta and Zhezhova, Silvana (2017) Analysis of composite materials based on polyethylene fibres for protective clothes. Knowledge - International Journal, Scientific and Applicative Papers, 20.5 (5). pp. 2147-2525. ISSN 1857-923X

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Protective clothing is to achieve safety for people in professional and other surroundings. Dangerous situations in witch are contemporary soldiers and police officers expose are multistage and includes shrapnel or fragments and bullets of high-speed rifles. Both types of dangers: fragments and bullets have special characteristics and require use of various types of protective materials. Usually, military vests protect the human body only from shrapnel, while the police vests protect against bullets from guns / revolvers. Protection from high-speed bullets and projectiles is additionally provided with composite plates made of ballistic materials whose function is to protect the vital organs of the human body. The plates are limited in size because of their weight. Generally, for personal ballistic protection (vest, helmet and plate) the two most important features are - the weight of ballistic equipment and the level of protection. Nowadays, the real challenge is to achieve an optimal balance between the protective surface on the one hand and the weight, comfort and mobility on the other. Because of this, for their construction most often are used special high-performance fibers such as ballistic nylon, para-aramides (aromatic polyamides) such as Kevlar®, Twaron® and polyethylene fibers such as Dyneema®, Spectra®, etc. These fibers are distinguished from ordinary conventional fibers because of their unique characteristic properties or areas of application. Fibers that are used for ballistic protection must have high strength, high modulus and low elasticity. High-strength and high-modulus fibers absorb the energy of impact, while low elasticity reduces the possibility to involve the materials to the body during the shooting. For ballistic protection various types of textile products can be used: felt, unidirectional tapes, fabrics and fiber reinforced plates. It is clear that the stopping mechanism of the projectile in all of the above cases is different due to the variety of materials. Textile products are used to protect two basic categories of ballistic projectiles. In one category belong bullets and guns, while the other category includes fragments of explosives and grenades. In this paper, the ballistic characteristic V50 of composite plates made of high molecular weight polyethylene fibers, in the form of a fabric and a unidirectional tape, has been experimentally tested. Results of the influence of pressing pressure on the traumatological effect and ballistic characteristics of unidirectional composites based on ultra-high molecular weight polyethylene fibers are also presented. Keywords: ballistics, laminate, V50, polyethylene fibers, fabric, unidirectional tape.

Item Type: Article
Subjects: Engineering and Technology > Materials engineering
Divisions: Faculty of Technology
Depositing User: Sanja Spasova
Date Deposited: 05 Feb 2018 10:36
Last Modified: 29 Mar 2018 11:08

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