锻压技术

吉帕级复相钢动态力学性能和本构模型分析

英文标题：Analysis on dynamic mechanical properties and constitutive model for GPa-grade complex phase steel

作者：余建华1 赵同铭2

分类号：TG142.1+3；U463.83

出版年,卷(期):页码：2025,50(7):120-131

摘要：

为了分析应变速率对吉帕级复相钢力学性能的影响,基于高速拉伸试验机对7种应变速率下HC780/980CP钢的力学性能进行测试，并提取了关键指标的变化规律。采用Johnson-Cook模型和Swift-Hockett-Sherby组合模型拟合获取材料本构模型曲线；基于MMC失效模型，设计不同试样测试方案，并拟合获取材料的失效曲线。基于防撞梁动态三点弯曲试验和仿真结果对比，验证了所搭建本构模型的精度。结果表明：HC780/980CP钢的屈强比达到0.857，表现出应变速率正敏感性，并且在高应变速率范围内敏感性更高；Swift-Hockett-Sherby组合模型拟合曲线强度偏差均值为2.85%，抗拉强度偏差均值为5.17%，表征精度更优；零件仿真与试验结果基本一致，Swift-Hockett-Sherby组合模型获得的最大载荷偏差为4.6%，而Johnson-Cook模型则为12.22%，证明组合模型的表征精度更高，更适用于表征HC780/980CP钢的动态力学性能。

In order to analyze the influences of strain rate on the mechanical properties of GPa-grade complex phase steel, the mechanical properties of HC7801/980CP steel under seven strain rates were tested by the high-speed tensile testing machine, and the variation patterns of key performance indicators were extracted. Furthermore, the material constitutive model curve was fitted by Johnson-Cook model and Swift-Hockett-Sherby combined model, based on the MMC failure model, the different sample test schemes were designed to fit the failure curve of the material, and the accuracy of the constructed constitutive model was verified based on the comparison between dynamic three-point bending test and simulation results of anti-collision beam. The results show that the yield strength ratio of HC780/980CP steel reaches 0.857, which shows positive sensitivity to strain rate, and the sensitivity is higher in the high strain rate range. The average strength deviation of fitting curve for the Swift-Hockett-Sherby combined model is 2.85%, and the average tensile strength deviation is 5.17%, with better characterization accuracy. The simulation and test results of part are basically consistent, the maximum load deviation obtained by the Swift-Hockett-Sherby combined model is 4.6%, while the Johnson-Cook model is 12.22%. The results show that the combined model has higher characterization accuracy, which is more suitable for characterizing the dynamic mechanical properties of HC780/980CP steel.

基金项目：

山西省教育科学“十四五”规划2022年度课题（GH-221002）

作者简介：余建华（1980-），女，硕士，讲师 E-mail：31333956@qq.com

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