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
弹性形发生的范围，其应力将不再与应成正
，永久的、不可回复的形发生，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.
当材料的形弹性形发生的范围，其应力将不再与应成正，永久的、不可回复的形发生，即为塑性形。
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