冲击波载荷下复合夹芯结构能量耗散特性研究

Damage characteristics of composite sandwich structure subjected to underwater explosive shock wave loading

基于复合材料三维力学模型和Hashin失效准则,结合商用软件ABAQUS二次开发技术,编写定义复合材料力学行为的VUMAT子程序,同时采用CEL方法,研究激波管产生的冲击波载荷作用下复合夹芯结构的动态响应。通过与实验结果的对比分析,验证数值模型的准确性,进而探讨夹芯板的面板芯材厚度比、泡沫芯材密度梯度对夹芯板能量耗散特性的影响。结果表明,复合夹芯板吸收的总能量随着面板芯层厚度比增加而减小,芯层吸收的能量占据了夹芯板总吸收能量的65%~80%之间,随着芯层厚度比的增加而减小;渐增密度的芯层排列方式不仅使结构抵抗破坏的能力增强,同时还能使夹芯结构吸收能量效率提升。

Based on the three-dimensional mechanical model of composites and Hashin failure criterion,a VUMAT subroutine defining the mechanical behavior of composites is compiled in this paper.Combined with the secondary develop-ment technology of commercial software ABAQUS and cel method,the dynamic response of composite sandwich structure under shock wave load generated by shock tube is studied.Through the comparative analysis with the experimental results,the accuracy of the numerical model is verified,and then the influence of the panel core thickness ratio of the sandwich pan-el on the deformation and energy absorption characteristics of the sandwich panel is discussed.The results show that the total energy absorbed by the composite sandwich panel decreases with the increase of the core layer thickness ratio.The energy absorbed by the core layer accounts for 65%to 80%of the total energy absorbed by the composite sandwich panel,and de-creases with the increase of the core layer thickness ratio.The increasing density of the core layer arrangement not only en-hances the ability of the structure to resist damage,but also improves the energy absorption efficiency of the sandwich structure.