锻压技术

基于MMC韧性断裂准则的高强双相钢成形极限研究

英文标题：Research on forming limit for high-strength dual-phase steel based on MMC ductile fracture criterion

作者：杨婷张青邢承亮董伊康李晓广

分类号：TG301

出版年,卷(期):页码：2022,47(8):255-260

摘要：

以高强双相钢CR450/780DP板材为研究对象，设计4种拉伸试样进行单向拉伸试验，获得了载荷-位移曲线与表面全场应变结果；采用有限元仿真分析手段，对4种试样的试验结果进行了对标分析，得到了材料硬化本构模型及应力三轴度、Lode角参数、等效塑性应变等历程数据；采用曲面拟合优化方法标定MMC韧性断裂准则的断裂参数。基于Keeler公式及简化的MMC韧性断裂准则分别绘制了高强双相钢CR450/780DP板材的理论和预测成形极限图，并通过半球形刚模胀形试验对预测结果进行验证。由对比结果可知，基于MMC韧性断裂准则预测的成形极限曲线与试验数据的吻合程度较高，验证了韧性断裂准则对高强双相钢CR450/780DP板材损伤与断裂预测的准确性与适用性。

For the high-strength dual-phase steel CR450/780DP sheet, the four kinds of tensile specimens were designed to perform uniaxial tensile tests, and the load-displacement curve and the surface full-field strain results were obtained. Then, the test results of the four kinds of specimens were benchmarked and analyzed by the finite element simulation analysis method, and the material hardening constitutive model and the history data such as stress triaxiality, Lode angle parameters and equivalent plastic strain were obtained. Furthermore, the fracture parameters of MMC ductile fracture criterion were calibrated by surface fitting optimization method, based on the Keeler formula and simplified MMC ductile fracture criterion, the theoretical and predicted forming limit diagrams of high-strength dual-phase steel CR450/780DP sheet were drawn respectively, and the predicted results were verified by the hemispherical rigid die bulging test. The comparison results show that the forming limit curve predicted based on the MMC ductile fracture criterion is in good agreement with the experimental data, which verifies the accuracy and applicability of the ductile fracture criterion for the damage and fracture prediction of high-strength dual-phase steel CR450/780DP sheet.

基金项目：

作者简介：杨婷（1991-），女，硕士，工程师，E-mail：yangting@hbisco.com

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