(1. 天津科技大学 机械工程学院，天津300222；
2. 中国民航大学 航空工程学院，天津300300)
摘 要: 本构模型参数的准确性是粉末成形数值模拟成功的关键因素。采用修正的Drucker-Prager Cap模型对金属粉末压制成形过程进行模拟，基于ABAQUS-MATLAB联合仿真平台，利用复合形优化算法，结合普通模压实验验证，以数值模拟与实验压制力数据的差异性形成目标函数，对其进行最小化，获取本构模型参数。采用材料参数联合反演优化计算Ag57.6-Cu22.4-Sn10-In10混合金属粉末的本构模型参数。结果表明，采用反演优化方法计算得到的本构模型参数较实验测试结果非常接近，通过粉末成形压制力和相对密度模拟结果与文献实验结果对比，进一步验证联合反演优化方法的可行性。
关键字: 修正Drucker-Prager Cap模型；反演优化；复合形法；材料参数
（1. School of Mechanical Engineering, Tianjin University of Science and Technology, Tianjin 300222, China;
2. School of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China）
Abstract:The accuracy of the constitutive model parameters is a key factor in the numerical simulation of powder forming. The modified Drucker-Prager Cap model was used to simulate the forming process of metal powder. Based on the ABAQUS-MATLAB joint simulation platform, the compound optimization algorithm was combined with the common die compaction test. The objective function was formed based on the discrepancy in force-displacement data between the numerical model prediction and the experiment. The objective function was minimized to obtain the parameters of the constitutive model. The joint inversion of material parameters was used to optimize the parameter calculation of the constitutive model for Ag57.6-Cu22.4-Sn10-In10 mixed metal powder. The results show that the constitutive model parameters calculated by the inversion optimization method are very close to the experimental results. The feasibility of the joint inversion optimization method is further verified by comparing the simulation results of the powder forming compression force and the relative density with the experimental results.
Key words: modified Drucker-Prager Cap model; inversion optimization; complex method; material parameter
