基于优化法的金属材料应力-应变曲线反演

Inversion of metal material stress-strain curve based on optimization method

采用优化法反演金属材料的应力-应变曲线.建立与试验边界条件一致的有限元仿真模型,并用Abaqus进行有限元仿真.设计变量为给定应变下的应力参数,优化目标是使模拟的应力-位移曲线与试验曲线一致,采用自适应响应面法和序列二次规划法开展优化迭代.结果表明,反演参数能很好地表现材料行为特征,为下一步仿真分析提供材料数据基础.

An inverse approach is applied to identify metal material strain stress curve through optimization method. A finite element model is built which is consistent with the experimental boundary conditions, and Abaqus is used to perform finite element simulation. The design variables are stress parameters under the given strain, the optimization objective is to minimize the difference between the simulated stress strain curve and the experimental one. All the optimization are done by adaptive response surface method and sequential quadratic programming method. The results indicate that the material behavior characteristics can be presented perfectly by inverse parameters, which can provide basic material data for the further simulation and analysis.