As the material is deformed beyond the strain that elastic deformation persists, the stress is no longer proportional to strain, and permanent, nonrecoverable, or plastic deformation occurs.
当材料的形
超出弹性形
的范
，
力将不再与成正
，永久的、不可回复的形，即为塑性形。
As the material is deformed beyond the strain that elastic deformation persists, the stress is no longer proportional to strain, and permanent, nonrecoverable, or plastic deformation occurs.
当材料的形超出弹性形的范，力将不再与成正，永久的、不可回复的形，即为塑性形。
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