Transactions of Materials and Heat Treatment

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

Authors： Yu Jianhua1 Zhao Tongming2

Unit： 1.Department of Automotive Engineering Shanxi Institute of Mechatronical & Electrical Engineering 2.Liuzhou Wuling Automobile Industry Co. Ltd.

KeyWords： complex phase steel mechanical properties constitutive model sensitivity bumper beam three-point bending

ClassificationCode：TG142.1+3；U463.83

year,vol(issue):pagenumber：2025,50(7):120-131

Abstract：

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.

Funds：

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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