Numerical modeling and analysis for axial compressive crushing of randomly oriented thermoplastic composite tubes based on the out-of-plane damage mechanism
Numerical modeling and analysis for axial compressive crushing of randomly oriented thermoplastic composite tubes based on the out-of-plane damage mechanism
复制标题
基于面外损伤机制的随机取向热塑性复合材料管材轴向压缩破碎数值模拟与分析
DOI：
10.1016/j.compstruct.2017.08.104
复制
发表时间：
2017
影响因子：
6.3
通讯作者：
Keisuke Sakaguchi
中科院分区：
文献类型：
--
作者：
T. Matsuo;Mitsuharu Kan;K. Furukawa;Takuya Sumiyama;H. Enomoto;Keisuke Sakaguchi
具有均匀帽形横截面的结构梁是通过高循环压缩成型技术，使用随机取向的短切热塑性复合材料制造的。防撞管是通过将这两个帽形梁在其凸缘处进行振动焊接而获得的。并对其进行了轴向压缩冲击试验。由此可见，当比能量吸收如此之高时，压缩破坏是由壁和焊接法兰的分层和局部屈曲引起的渐进式破碎。构建有限元模型来预测轴向渐进破碎和能量吸收。设计数值模型的重要关键概念是即使在随机取向的复合材料中也加入一些假设的夹层，并将它们与失效模型一起指定为内聚区元素，这些元素可以通过失效准则表现出非线性特征。模型的材料参数试图通过直接测量测试方法获得。根据轴向压缩破碎的结果验证了数值模型的再现性。渐进损伤模式和能量吸收预测与实验结果吻合良好。还澄清了面外故障影响了碰撞管的能量吸收性能。
The structural beams with a uniform cross section of hat-shape were manufactured through a high-cycle compression molding technique, by using randomly oriented chopped thermoplastic composites. The crash tubes were obtained by vibration welding of those two hat-section beams at their flanges. And the axial compressive impact tests were carried out for them. It followed that the compressive failure was progressive crushing caused by the delamination and local buckling of walls and welded flange while the specific energy absorption was so high. The finite element model was constructed to predict the axial progressive crushing and energy absorption. The important key concept for designing the numerical model was to incorporate some hypothetical inter-layers even in randomly oriented composites and assign them with the failure model as cohesive zone elements, which can perform non-linear characteristics with failure criterion. The material parameters for the model tried to be obtained by direct measurement test methods. The reproducibility of the numerical modeling was validated against the results from axial compressive crushing. The progressive damage mode and energy absorption prediction agreed well with the experimental results. It was also clarified that the out-of-plane failure influenced the energy absorption performance of the crash tubes.