等温过程
材料科学
应变率
绝热过程
可塑性
变形(气象学)
拉伤
流动应力
压力(语言学)
复合材料
热力学
冶金
机械
物理
医学
内科学
语言学
哲学
作者
Clarence Zener,J. H. Hollomon
摘要
An experiment has been designed to check a previously proposed equivalence of the effects of changes in strain rate and in temperature upon the stress-strain relation in metals. It is found that this equivalence is valid for the typical steels investigated. The behavior of these steels at very high rates of deformation may, therefore, be obtained by tests at moderate rates of deformation performed at low temperatures. The results of such tests are described. Aside from changing the isothermal stress-strain relation, an increase of strain rate tends to change the conditions from isothermal to adiabatic. It is found that at low temperatures, the adiabatic stress-strain relation in the plastic range is radically different from the isothermal, having an initial negative rather than a positive slope. This initial negative slope renders unstable homogeneous plastic deformation.
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