考虑残余应力的金属波纹垫压缩-回弹性能有限元分析

Finite Element Analysis of Compression-Resilience of Corrugated Metal Gaskets with Residual Stress

为探讨金属波纹垫模压成型过程的残余应力和应变强化对垫片压缩-回弹性能的影响,在试验的基础上,建立考虑制造残余应力的金属波纹垫压缩回弹有限元分析方法,并将分析结果与试验结果进行对比。结果表明:有限元计算结果与试验结果吻合较好,两者的垫片最大压紧载荷误差为1. 30%,压缩率误差为9. 08%,回弹率误差为13. 90%。根据有限元计算结果将金属波纹垫的变形历程分成3个阶段,对其变形机制进行分析,研究轴向载荷作用下金属波纹垫的压缩-回弹过程。研究表明:轴向载荷作用下金属波纹垫依次发生弹性变形、塑性屈服和弹性恢复阶段。

To study the influence of residual stress and strain hardening produced by manufacture process on compression and resilience performance of corrugated metal gaskets,a finite element analysis method of compression and resilience process for corrugated metal gaskets was established,which considered the effect of residual stress caused by manufacture process and is based on the experiments.By comparing the analysis results with the experimental results,it is shown that the finite element calculation results are in good agreement with the experimental results,the error of the maximum compressive load is 9.08%,the error of compression rate is 9.08% and the error of resilience is 13.90%.The deformation mechanism was analyzed by dividing the deformation process of the corrugated metal gasket into three stages according to the finite element calculation results,and the compression and resilience process of the corrugated metal gasket under the axial load was studied.The result shows that elastic deformation,plastic yielding and elastic recovery stages of corrugated metal gasket occur under the axial load.