Ballistic performance of glass reinforced plastic (GRP) composite plates containing coarse sized sand filler was investigated as an attempt towards developing a low cost armored system. In all, 10 different types of plates from 4 to 12 layers of E-glass chopped strand mat reinforced polyester resin containing 0, 10, and 20% of 600- to 700-μm sized sand filler were tested. A smooth barrel gas gun was used to conduct high velocity tests in the range of 70-185 m/s. Results indicated higher ballistic performance for GRP plates with sand filler in terms of higher ballistic limits (velocity at which at least 50% of samples were partially or fully penetrated the target plates with zero residual velocity), particularly for plates with highest sand filler loadings. Energy absorption associated with these specimens also showed higher performance. Delamination was identified as dominant failure mode, in particular for thicker specimens with highest sand filler loading. Specific energy absorption per weight per unit area for the composite plates indicated diminishing effectiveness with increase in sand filler loading, thereby limiting its possible application to armored system for stationary objects only.
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机译：为了开发低成本的装甲系统，研究了含有粗砂填充物的玻璃钢（GRP）复合板的弹道性能。总共测试了10种不同类型的板，这些板由4到12层E-玻璃纤维短切毡增强聚酯树脂组成，其中包含0％，10％和20％的600-700μm尺寸的砂填料。使用光滑的枪管气枪进行70-185 m / s范围内的高速测试。结果表明，在较高的弹道极限（至少50％的样品以零残余速度零速或部分穿透目标板的速度）下，含砂填料的GRP板具有更高的弹道性能，尤其是对于装沙量最高的板。这些样品的能量吸收也显示出更高的性能。分层被认为是主要的破坏模式，特别是对于填充量最高的较厚试样而言。复合材料板每单位面积重量的比能量吸收表明，随着填沙量的增加，有效性降低，从而限制了其仅可用于固定物体的装甲系统的应用。
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