STRAIN-DEPENDENCE OF PLASTIC STRAIN RATIO OF DEEP-DRAWING ALUMINIUM-KILLED STEEL SHEET

来源期刊：中国有色金属学报(英文版)1996年第1期

论文作者：Li Saiyi Zhang Xinming Chen Zhiyong

文章页码：95 - 99

Key words：plastic strain ratio ; anisotropy ; tension

Abstract: The change of width and length of an aluminium-killed(AK) steel sheet was measured in detail at various tensile strain levels. The effects of tensile strain on the conventional strain ratio. r^c-value，and the instantaneous strain ratio，rⁱ-value，were analyzed. It was shown that the strain ratio of the AK steel sheet had obvious strain-dependency. The individual r^c -values for all tested directions tended to unity with increasing strain so that the planar anisotropy decreased with increasing strain. The rⁱ-value had overall strain-denpendency similar to that of r^c-value，though it was overly sensitive to the experimental errors and showed significant variation with strain . In the representation of average strain ratio. the linear regression strain ratio，r^r-value，which was obtained by fitting a straight line to the ε_W VS ε_T curve，is preferable to the r^c -value measured at some specfic extension