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针对先进高强钢卸载时存在的明显非弹性回复的情况,从能量角度深入分析非弹性回复现象的机理,考虑加载-卸载过程的非弹性回复应变并引入双屈服面理论,建立一种考虑塑性预应变及卸载应力变化的卸载弹性模量模型本构来进行回弹仿真预测。并以某梁类零件为例,对比了新卸载弹性模量本构、Yoshida本构、常规弹性模量本构等的回弹仿真结果与试验结果的区别。研究结果表明:非弹性回复应变具有可逆性与消耗能量的特点,是引起非弹性回复行为的主要原因;新的材料本构模型回弹仿真结果与试验值吻合较好,对比其它模型仿真结果其精度有所提高。
Aiming at the obvious non-elastic recovery of advanced high-strength steel during unloading, from the energy point of view, the mechanism of inelastic recovery phenomenon is analyzed in detail. Considering the inelastic response of loading-unloading process and introducing double yield surface theory, Strain and unloading stress changes unloading elastic modulus constitutive model for springback simulation prediction. Taking the beam part as an example, the difference between the springback simulation results of the new unloading elastic constitutive model, the Yoshida constitutive model and the conventional elastic modulus constitutive model is compared with the experimental results. The results show that the non-elastic recovery strain has the characteristics of reversibility and energy consumption, which are the main causes of inelastic recovery behavior. The new material constitutive model springback simulation results are in good agreement with the experimental values. Comparing with other simulation results Accuracy has improved.