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
形变超出弹性形变发生范围，其应力将不再与应变成正
，永久、不可回
形变发生，即为塑性形变。
回[
]
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.
当材料形变超出弹性形变发生范围，其应力将不再与应变成正，永久、不可回形变发生，即为塑性形变。
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