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
形
超出弹性形发生范围，其应力将不再与应
，
、不可回复形发生，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.
当材料形超出弹性形发生范围，其应力将不再与应，、不可回复形发生，即为塑性形。
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