摘要: Ballistic testing was conducted on two composite materials: 8HS satin weave S-glass fiber and plain weave Aramid (Kevlar® KM2 600 Denier) fiber, both with a UAF-472 polyurethane thermoplastic matrix. The goals of the ballistic tes... 展开 Ballistic testing was conducted on two composite materials: 8HS satin weave S-glass fiber and plain weave Aramid (Kevlar® KM2 600 Denier) fiber, both with a UAF-472 polyurethane thermoplastic matrix. The goals of the ballistic tests were to determine the effect of matrix material, shot dependency with regard to shot-to-shot distance, degree of penetration from previous shots, and delamination effects of previous shots on the ballistic limit of the material. The measure of performance for each ballistic limit was the projectile velocity with a 50% probability of completely penetrating the armor material, known as V_(50). The ballistic limit was determined by a three-phase optimal design test method, called 3-Pod. The delamination extent was determined by an audiovisual tap test. All plates were 0.25 inches thick and shots were conducted with no obliquity. This investigation was in response to previous research which showed mixed results in the ballistic limit with delamination overlap. The current research found a statistically significant increase in the ballistic limit for Aramid (but mixed results for S-glass) fiber materials in regard to secondary shots. For both materials, there were overall ballistic limit increases when compared to previous research using the same fiber, but with a different matrix. 收起