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首页> 外文期刊>Journal of Materials Engineering and Performance >Analytical Model of High-Velocity Impact of a Deformable Projectile Against Textile-Based Composites
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Analytical Model of High-Velocity Impact of a Deformable Projectile Against Textile-Based Composites

机译：可变形射弹对纺织基复合材料的高速冲击的分析模型

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Textile-based composites are used in manufacturing of ballistic shields due to their favorable combination of mechanical properties which enables weight saving and efficiency while retaining or even improving ballistic performance. Predictive models are an important tool in reducing experimental tests which are still an important step in ballistic shield design. Among those, analytical models provide less accurate results but require far less computational cost than numerical models and can be used for preliminary analyses. Many authors in the literature have developed analytical models for high-velocity impact on textile-based composites based on wave propagation theory and an energy equilibrium approach. The main limitation of these models is the assumption of rigid projectile which leads to the underestimation of the ballistic limit for soft core projectiles, which are a very common type of threat for this kind of protection. For this reason, an enhanced version of these models is reported in this paper, which releases the assumption of rigid projectile and adds erosion and deformation of the projectile to the formulation. Ballistic tests were performed on panels manufactured from layers of Kevlar 29 plain weave fabric embedded in an epoxy matrix. An insight into the different kinds of energy absorption considered by the model shows that projectile deformation plays an important role in the dissipation of the kinetic energy of the projectile in case of intermediate impact velocity. For this reason, the present model delivers more accurate results than the models present in the literature. In particular, the estimation of the ballistic limit is drastically improved which is a key step in ballistic shields optimization.
机译：基于纺织基复合材料用于制造弹道屏蔽，由于它们的机械性能的有利组合，可以在保持甚至提高弹道性能的同时实现重量储蓄和效率。预测模型是减少实验测试的重要工具，这仍然是弹道屏蔽设计的重要一步。其中，分析模型提供了不太准确的结果，但需要比数值模型更少的计算成本，并且可用于初步分析。文献中的许多作者对基于波传播理论的纺织基复合材料和能量平衡方法开发了对高速撞击的分析模型。这些模型的主要限制是刚性射弹的假设，这导致软芯弹丸的弹道极限产生了低估，这是对这种保护的一种非常常见的威胁类型。因此，本文报道了这些模型的增强版本，释放了刚性射弹的假设，并增加了射弹对配方的侵蚀和变形。在由嵌入环氧基质中嵌入的凯夫拉尔29平原织物层制造的面板上进行弹道试验。对模型考虑的不同类型的能量吸收的洞察显示，在中间冲击速度的情况下，射弹变形在射弹的动能的耗散中起着重要作用。因此，本模型提供比文献中存在的模型更准确的结果。特别地，弹道极限的估计是大大改进的，这是弹道屏蔽优化的关键步骤。

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