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

• Ano de defesa: 2020
• Autor(a) principal: Marlet, Carlos Alberto Fernandes [UNIFESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Paulo (UNIFESP)
• Palavras-chave em Português: Aramid Fabric; Three-Directional Fabric; Three-Directional Multilayer Reinforcement; High Energy Impact; Ballistic Protection; Tecido De Aramida; Tecido Tridirecional; Reforço Multicamadas Tridirecional; Impacto De Alta Energia; Proteção Balística
• 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

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.