一种钢板材料动态拉伸本构方程确定以及试件尺度效应研究

DETERMINATION OF DYNAMIC TENSILE CONSTITUTIVE EQUATION FOR STEEL SHEET MATERIAL AND DISCUSSION OF EFFECTS OF SPECIMEN SCALE ON EXPERIMENTAL RESULTS

摘要: 采用数值模拟方法,优化设计了Hopkinson拉伸实验中,QP980CR钢的片状试件尺度。对所设计的试件,在MTS(810材料试验机)上进行了准静态拉伸试验,在Hopkinson拉杆装置上进行了不同应变率及不同温度的动态拉伸试验。由准静态及动态拉伸试验结果,确定了试件材料的J-C型动态拉伸本构方程。基于确定的试件动态拉伸本构方程,采用数值模拟方法,研究了Hopkinson拉伸试验中,试件的形状和尺度对测试结果的影响。

Abstract: Tensile split Hopkinson bar (TSHB) tests for QP980CR steel sheet specimens were optimized by using numerical simulation. The static tensile tests on an 810 material test system (MTS) and the dynamic tensile tests on TSHB at different strain rates and temperatures were performed for these specimens. Based on the stress-strain data obtained from static and dynamic tensile tests, J-C type tensile constitutive equation of this material was determined. The effects of specimen scale on the experimental results were also analyzed.