MATERIAL CONSTITUTIVE LAW FOR LARGE STRAINS AND STRAIN RATES. TECHNICAL NOTE
MATERIAL CONSTITUTIVE LAW FOR LARGE STRAINS AND STRAIN RATES. TECHNICAL NOTE
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DOI：
10.1061/(asce)0733-9399(2000)126:2(215
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发表时间：
2000-02
期刊：
影响因子：
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通讯作者：
M. Alves
中科院分区：
文献类型：
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作者：
M. Alves
本说明对拉伸试验中发现的应变率模式进行了评论。这一应变率模式很容易表明，Cowper-Symonds(CS)方程(Jones，1989)将静态和动态流动应力与应变率联系在一起，除非其系数发生变化，否则对较大范围的应变是无效的。对CS方程进行了修正，对任意应变和应变率水平下的动态流动应力进行了较好的预测。
This note comments on a strain rate pattern found in tensile tests. This strain rate pattern readily suggests that the Cowper-Symonds (CS) equation (Jones, 1989) relating the static and dynamic flow stresses with the strain rate is not valid for a broad range of strains unless its coefficients change. A modification of the CS equation is proposed, and good prediction of the dynamic flow stress at any strain and strain rate level was obtained.