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在M-K模型基础上,将Logan-Hosford屈服准则和Rossard硬化方程引入成形极限的理论预测,结合弦截法迭代计算,利用MATLAB软件对IF钢(DX54D+Z)的成形极限进行了求解。在此基础上,分析了不同屈服准则、应变强化指数、应变速率敏感系数和厚度不均值对成形极限图理论预测的影响。IF钢埃里克森实验结果表明:实验数据与基于M-K模型的理论预测结果吻合。
On the basis of M-K model, Logan-Hosford yield criterion and Rossard hardening equation are introduced into theoretical prediction of forming limit. Combined with the iterative calculation of chord-cut method, the forming limit of IF steel (DX54D + Z) is solved by MATLAB software. Based on this, the influence of different yield criterion, strain hardening index, strain rate sensitivity coefficient and thickness unevenness on the prediction of forming limit map theory is analyzed. IF steel Erickson experimental results show that the experimental data are consistent with the theoretical prediction based on the M-K model.