应力与应变之比，即每单位应变的应力，叫做该材料的弹性模量。
The ratio of stress to strain, or the stress per unit strain, is called an elastic modulus of the material.
应变或者单位变形是材料上的压力造成材料大小和形状的单位改变量。
Strain, or unit deformation, is defined as the unit change in the size or shape of material as a result of force on the material.
研究了坯料尺寸对等径角挤压材料等效应变及单位挤压力的影响。
The effect of billet size on the effective strain and unit extrusion pressure was investigated during equal channel angular pressing.
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