High speed tensile test of sheet steels for automotive use and axial collapse test of columns

作     者：Kojima, Nobusato Mizui, Naomitsu Fukui, Kiyoyuki Kawaguchi, Yoshiaki Tsukamoto, Masatoshi 

出 版 物：《Sumitomo Metals》 (Sumitomo Met)

年 卷 期：1998年第50卷第3期

页      面：31-40页

核心收录：

主　　题：Steel sheet 

摘      要：It seems effective to apply the higher strength sheet steels to automotive structure for improving crashworthiness. Tensile testing properties at high strain rate have to be understood because of the strain-rate dependency of strength. It is also necessary to evaluate the components, such as front side members absorbing energy in frontal collision. We have the high speed tensile machine, which is capable to obtain the strain rate of order of 103/s, and the dynamic fracture testing machine, which is capable to apply the load of 50 tonf at 4 m/s. With these facilities, evaluation and development of sheet steels for automobiles are carried out. The facilities and methods are explained and the results of high speed tensile test and axial collapse test of column for several steels are reported. It is clarified that dynamic tensile strength increases, dynamic-static ratio decreases and energy absorption of column collapse increases with increasing quasi-static tensile strength. Steel with retained austenite exhibits about 10% higher energy absorption than other steel with same tensile strength.