Per: Bernardo Soares Avila de Cêa (instituto militar de engenharia), Fabio Da Costa Garcia Filho (CEFET/RJ), Sergio Neves Monteiro (INSTITUTO MILITAR DE ENGENHARIA), Édio Pereira Lima Júnior (INSTITUTO MILITAR DE ENGENHARIA), Lucio Fabio Cassiano Nascimento (INSTITUTO MILITAR DE ENGENHARIA), Laura Setti de Sousa (INSTITUTO MILITAR DE ENGENHARIA)
Abstract:
Aramid is a high-performance material already well-established in the market for various applications, prominently featuring in the use of components subjected to ballistic conditions. Polymeric composites reinforced with aramid fabric also demonstrate a significant ability to absorb energy when subjected to ballistic tests. From the perspective of composite material development, it is known that, in addition to the properties exhibited by the constituent phases, matrix and reinforcement, the type of arrangement, their disposition, distribution, as well as the volumetric fraction of each phase, are determining factors in the properties exhibited by the material. In this context, this study investigates the influence of two types of configurations, employing a simple arrangement of aramid fabric as reinforcement in an epoxy matrix composite, in order to compare their abilities in energy absorption. The configurations of the aramid fabric used for comparison are as follows: stacking layers of the fabric following the same orientations, in other words, with fibers oriented at 0°/90° in all layers; and alternating layers of the fabric with angles of -45°/0°/45°/90°. For the ballistic tests, high-energy 7.62 mm caliber ammunition was used. The obtained data were statistically processed using analysis of variance (ANOVA). Ballistic parameters such as limit velocity and deformation cone area, as well as prevailing failure mechanisms under both conditions, were investigated.
