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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 6    No. 1    March 1996

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STRAIN-DEPENDENCE OFPLASTIC STRAIN RATIO OF DEEP-DRAWING ALUMINIUM-KILLED STEEL SHEET
I_i Saiyi,Zhang Xintning,Chen Zhiyong

Department of Materials Science and Engineering,Central South University of Technolog,Changsha 410083

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. rc-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 rc -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 rc-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,rr-value,which was obtained by fitting a straight line to the εW VS εT  curve,is preferable to the rc -value measured at some specfic extension

 

Key words: plastic strain ratio   anisotropy     tension

ISSN 1672-7029
CN 43-1423/U

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