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

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.