Banca de DEFESA: PEDRO THIAGO DE LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : PEDRO THIAGO DE LIMA
DATE: 31/07/2025
TIME: 10:00
LOCAL: Quartel do Comando Geral da PM/RN - Sala de Multimídia
TITLE:

Study of composites for ballistic protection manufactured with artisanal fabrics and fabrics reused from discarded ballistic vests.

KEY WORDS:

Composite, Ballistic Protection, Fiberglass, Para-aramid, NIJ 0108.01

PAGES: 77
BIG AREA: Engenharias
AREA: Engenharia Mecânica
SUBÁREA: Mecânica dos Sólidos
SPECIALTY: Análise de Tensões
SUMMARY:

The present work studies the behavior of composite material with different weaving configurations when subjected to high-energy impact such as ballistic. Four plates were developed by a hand lay-up process using different para-aramid fabrics: Tela, Sarja, and Non-Woven Fabric (TNT). Three plates contain a single type of fabric. After preliminary shot tests on the first three plates and considering the tendency of individual behavior, we decided to manufacture the fourth plate containing a combination of sarja and TNT. We used the Tela fabric because it is an available product for application in the composite industry. Sarja was selected because it is an artisanal product developed in the weaving laboratory of the Department of Textile Engineering at UFRN as an alternative and comparative proposal to the material available on the market. We obtained the TNT fibers by dismantling the expired ballistic vest used by the Military Police of the State of Rio Grande do Norte as a source of non-woven fabric and quilted fibers. For each target plate submitted to the impact test, a single shot was fired at each plate using calibrated ammunition provided by the General Command of the Military Police of RN. The shots were fired by a qualified PM/RN shooter using the same weapon for all shots at a controlled shooting range and using .38 caliber SPL +P+, EXPO/SJHP ammunition produced by CBC. We extracted the projectile from its original case to initial deformation control. We shot another projectile on plasticine to capture its post-impact standard characteristic after ballistic impact. The impact energy utilized was approximately 360J on all plates, with the projectiles transfixing the three plates that used a single type of fabric. In the target plate combined with handmade Sarja and TNT from ballistic vest recycling, the projectile finished encapsulated inside the plate's laminate. The discussion of the four configurations of the laminated composite material for the present work analyzed the post-impact visual and microscopic appearance. Furthermore, we discuss the deformation behavior of the recovered projectile after impact on the target plates. After the final analysis, we noticed that the combination of sarja plus TNT fabrics suggests that the study presents evidence that the material from the expired ballistic vest can be recycled, providing fibers for use in ballistic shields, bringing new applications and over life to its materials.

COMMITTEE MEMBERS:
Presidente - 1064594 - EVANS PAIVA DA COSTA FERREIRA
Interno - 2239386 - JOSE IVAN DE MEDEIROS
Externa ao Programa - 1645481 - VIVIANE MUNIZ FONSECA - UFRNExterno à Instituição - JOÃO BATISTA DA SILVA
Externo à Instituição - WANDERLEY FERREIRA DE AMORIM JÚNIOR - UFCG