Obtenção e caracterização de tecido de Aramida tridirecional visando aplicações sujeitas a impactos de alta energia

Detalhes bibliográficos
Ano de defesa: 2020
Autor(a) principal: Marlet, Carlos Alberto Fernandes [UNIFESP]
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Tese
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: https://sucupira.capes.gov.br/sucupira/public/consultas/coleta/trabalhoConclusao/viewTrabalhoConclusao.jsf?popup=true&id_trabalho=9464668
https://hdl.handle.net/11600/64748
Resumo: The evolution of ballistic protection systems, both individual and equipment, has occurred due to the search for increasingly efficient and lightweight devices, with an increasing use of bidirectional (2D) reinforcements of aramid fiber. In this scope, the present work aimed to produce a multilayer reinforcement of aramid fiber with three-directional (3D) arrangement, with six layers of plain weave fabric, tied together by the warp yarn. The processed 3D-fabric was used in composite processing using epoxy resin matrices, which was tested as resistant material to high energy impacts. For the production of 3D-fabric, the adaptation of a conventional loom used in production of 2D fabric was carried out. The 3D-reinforcement was characterized by typical tests used in textile area, such as weight/area and linear yarn density in the weft and warp directions, and by mechanical resistance tests of tensile and impact by dart fall (drop test, at 340 J). The results obtained was weight/area (1,458.5 g/m2), linear warp density (7.2%), maximum tensile force (12,571 N, in warp direction), and drop test confirmed the successful of the 3D-fabric obtaining. After this, composites were obtained by using two types of epoxy matrices, one more rigid and the other more flexible. The drop tests and maximum tensile strength results showed that samples impregnated with the most flexible resin showed the best results, without delamination and perforation, indicating the potential of using of 3D-fabric as reinforcement of composites in applications involving low and medium energy impact resistance. Then, ballistic panels were prepared with 2, 3, and 4 layers of 3D-fabric, but all were perforated with .357 Magnun JSP (740 J) caliber shots, without the formation of the fracture cone, showing low resistance to high energy impacts. However, panels of 3D-fabric without impregnation resisted the penetration of the projectile, showing the effectiveness of the proposed 3D-arrangement as ballistic protection level IIA.