复合材料结构组件抗坠毁试验与渐进失效分析

Progressive failure analysis and crashworthiness experiment for composite structural discreteness

对复合材料吸能结构盒段进行了耐撞性(crashworthiness)试验研究,得到吸能所关心的载荷-位移曲线,并获得相应的平均载荷、峰值载荷以及吸收总能量相关吸能参数.考虑复合材料的各向异性本构关系,对有限元软件进行了二次开发.考虑含刚度退化的Hashin失效准则对结构组件进行渐进失效数值分析讨论.基于扩展的失效准则,设置相应的渐进削弱式的薄弱环节,模拟得到了吸能评价参数平均载荷值,数值计算得到的平均载荷值为361.10 k N.并与试验结果进行了比较,其相对误差不超过7%,计算结果与试验结果取得较好一致性,表明这种方法模拟分析结构组件抗坠毁是有效可行的.

The experimental crashworthiness research on energy-absorbing discrete structures of composite was carried out. The corresponding energy absorption load-displacement curves,the average load,the peak load and the total energy-absorbing parameters were all obtained. Considering the anisotropic constitutive relation of composites,the secondary development of the finite element software was applied. Considering the Hashin failure criterion with the stiffness degradation theory included,the progressive failure numerical analysis was discussed for the structural discreteness. Based on the extended failure criterion,a gradually weakness of layup triggers links style was set up respectively,also the average load of energy-absorbing evaluation parameter was obtained by numerical simulation,which is 361. 10 k N. Compared with the experimental results,the relative error is less than 7%,and the numerical simulation results agree well with those of the experiments,which indicate the feasibility and effectiveness of this method to estimate the crashworthiness of composite structural discreteness.