Abstract

The focus of the work reported here is on the prediction of the behaviour of a hollow cylindrical jute– polyester composite tube under axial impact using the explicit finite element analysis code, LS-DYNA. An efficient finite element modelling approach using a single shell element through the thickness of a thin-walled structural part has been chosen. Effective orthotropic material properties of a laminate which can be determined through standard ASTM tests have been used as input data for a popular constitutive model titled ‘Enhanced Composite Damage’ with the option of specifying either the Chang–Chang criteria or the Tsai–Wu criterion for failure. A unique feature of the current approach is to verify the modeling procedure initially for coupon-level tensile, compressive and flexural tests through a numerical design of experiments involving a set of physically meaningful fibre and matrix failure strain parameters, and then extend the same toward successfully predicting the mechanical behaviour of a jute composite tube subject to axial drop-weight impact. Theoretical predictions of peak responses for flexural and tube impact tests are also presented.

摘要

这里报告的工作重点是使用显式有限元分析代码 LS-DYNA 预测中空圆柱形黄麻-聚酯复合管在轴向冲击下的行为。已经选择了一种有效的有限元建模方法，该方法使用单个壳单元穿过薄壁结构部件的厚度。可以通过标准 ASTM 测试确定的层压板的有效正交各向异性材料特性已用作名为“增强复合材料损伤”的流行本构模型的输入数据，可选择指定 Chang-Chang 标准或 Tsai-Wu 标准失败。当前方法的一个独特功能是验证最初用于试样级拉伸的建模程序，通过涉及一组物理上有意义的纤维和基体失效应变参数的实验的数值设计进行压缩和弯曲测试，然后将其扩展到成功预测受轴向落锤冲击的黄麻复合管的机械行为。还介绍了弯曲和管冲击试验峰值响应的理论预测。