织物弹道贯穿性能分析计算

ANALYTICAL MODELING OF WOVEN FABRIC UNDER BALLISTIC PERFORATION

纤维织物增强复合材料由于轻质和高冲击损伤容限而在防弹装甲设计及制造中逐渐得到应用,如人体防弹衣和车辆防护装甲。但是尚无较好的方法直接计算复合材料防弹特性,其中困难在于复合材料弹道冲击过程中的应变率效应和冲击破坏机理至今没有被揭示。解决问题的第一步是建立复合材料增强相(即织物)防弹特性计算方法。提出基于纤维力学性质应变率效应的织物弹道冲击破坏分析模型,计算不同面密度织物靶体在弹道贯穿过程中的弹体剩余速度,由此反映靶体防弹特性。用本文中提出的简单算法预测的结果与实测结果在靶体厚度不大时极为接近,而且也有可能将其扩展到纤维织物增强复合材料防弹性质的计算。

Composite materials have become a key element in designing structural components subjected to impact loading, for example, in personal or vehicle armors. But it is difficult to model the behavior of composite materials under ballistic impact because of the complexity of damage mechanism. The first way to solve this problem is to model the primary part of composite materials before explanation of the behavior of the entire composite. An analytical model of multilayered fabrics based on the strain rate effect of the fiber property is developed in this paper. Ratedependent tensile property of Twaron filaments is also discussed. Application of the high strain rate property to ballistic perforation of multilayered fabrics conforms to the actual situation better than that of the quasistatic property. The analytical model proposed in this paper can be used to calculate the process of ballistic penetration and perforation on soft armours, such as fabric target plate, at intuitive approach and simple algorithm with a little computer process time. Predictions of the residual velocities and energy absorbed by the multilayered fabric show good agreement with experimental data.