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首页> 外文期刊>Composites >Experimental tests and numerical modelling of ballistic impacts against Kevlar 29 plain-woven fabrics with an epoxy matrix: Macro-homogeneous and Meso-heterogeneous approaches
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Experimental tests and numerical modelling of ballistic impacts against Kevlar 29 plain-woven fabrics with an epoxy matrix: Macro-homogeneous and Meso-heterogeneous approaches

机译：含环氧基质的凯夫拉尔29平纹织物的弹道冲击试验和数值模拟：宏观均质和中观非均质方法

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摘要

An investigation on the ballistic impact behaviour of tungsten blunt projectiles on Kevlar 29 plain woven fabrics with an epoxy matrix has been carried out for the purpose of gaining an insight in the phenomena at the level of the composite components. Numerical models have been developed and have then been compared with experimental results. The numerical models have been developed in LS-DYNA adopting two different approaches: a Macro-homogeneous model, in which each layer is modelled as an orthotropic equivalent, and a Meso-heterogeneous one, based on the definition of all the details of the fabric architecture in the area of impact of the projectile's tip (in this case, yarns and matrix have their own properties). In both models, the projectile is considered a rigid body. An in-depth analysis of the macro parameters, such as the residual velocities, their dependency upon the yaw impact angle and delamination has been performed. Also the stress state inside the layers and the morphological features of the damaged plates has been studied and interesting results regarding the behaviour of different layers of Kevlar 29 plain-woven fabrics during impact have been obtained. Performances and the pros/cons of the different numerical approaches have also been discussed. (C) 2015 Elsevier Ltd. All rights reserved.
机译：为了了解复合材料成分中的现象，已对钨钝弹在具有环氧基质的凯夫拉尔29平纹织物上的弹道冲击行为进行了研究。已经开发了数值模型，然后将其与实验结果进行了比较。在LS-DYNA中，采用两种不同的方法开发了数值模型：基于织物所有细节的定义的宏观均质模型，其中每一层均被建模为正交异性等效体，而均质非均质模型。弹头撞击区域的结构（在这种情况下，纱线和基体具有自己的属性）。在这两种模型中，射弹都被视为刚体。已对宏观参数（例如残余速度，它们对偏航冲击角的依赖性和分层）进行了深入分析。还研究了层内部的应力状态和损坏的板的形态特征，并且获得了关于在冲击过程中Kevlar 29平纹织物的不同层的行为的有趣结果。还讨论了不同数值方法的性能和优缺点。 （C）2015 Elsevier Ltd.保留所有权利。

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