elastic shear deformation

例句：

1. 1. The material undergoes elastic shear deformation under the action of external force.
   材料在外力作用下发生弹性剪切变形。
2. 2. During the process of plastic deformation, the material is deformed without any external force.
   在塑性变形过程中，材料没有外力作用就发生了变形。
3. 3. The elastic shear deformation of the material can be used to predict its mechanical properties.
   材料的弹性剪切变形可以用来预测其机械性能。