锻压技术

HC340LA动态力学性能研究及在碰撞工况中的仿真应用

英文标题：Research on dynamic mechanical properties of HC340LA and its simulation application in collision condition

关键词：高速拉伸 HC340LA低合金高强钢 Swift-Hockett-Sherby本构模型仿真标定落锤试验

分类号：U465.1+1

出版年,卷(期):页码：2019,44(1):176-181

摘要：

利用万能试验机、液压伺服高速拉伸试验机和霍普金森杆3种设备，开展了HC340LA低合金高强钢多个应变速率的拉伸试验，得到了不同应变速率下的应力-应变曲线，研究了其动态力学性能。对高速拉伸试验数据进行二次开发，采用Swift-Hockett-Sherby本构模型进行拟合外推，建立了HC340LA低合金高强钢的材料模型，并进行了纵梁部件落锤试验过程的数值模拟，数值模拟结果与落锤试验结果基本一致，验证了所建立的材料模型的准确性。同时，对比分析了液压伺服高速拉伸试验机和霍普金森杆设备的高速拉伸试验结果。结果表明：液压伺服高速拉伸试验机测量得到的中低应变速率动态曲线与材料准静态曲线有更好的对应关系；霍普金森杆设备适合更高应变速率的试验，无法精准获取材料的真实变形，只能准确测得材料的抗拉强度。

The tensile tests under different strain rates of HC340LA low-alloy and high strength steel were conducted by universal testing machine, hydraulic servo high-speed tensile testing machine and Split Hopkinson Pressure Bar (SHPB), and the stress-strain curves under different strain rates were obtained to research their dynamic mechanical properties. Then, the secondary development of the high-speed tensile test data was performed, and the curves were fitted and extrapolated by Swift-Hockett-Sherby constitutive model. Furthermore, the material model of HC340LA low-alloy and high strength steel was established, and the drop test of longitudinal beam component was simulated. The simulation results were basically consistent with the drop test results to verify the accuracy of the established material model. At the same time, the high-speed tensile test results of the hydraulic servo high-speed tensile testing machine and the SHPB were compared and analyzed. The results show that the dynamic curves of medium and low strain rates measured by hydraulic servo high-speed tensile testing machine have a better correspondence with the quasi-static curves of materials. And the SHPB is suitable for the higher strain rate test which can accurately measure the tensile strength of materials, but it cannot accurately obtain the actual deformation of materials.

基金项目：

李凡（1986-）男，硕士，工程师，E-mail：lifanhust@sina.com

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