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
变超出弹
变发生范围，其应力将不再与应变成正
，永久、不可回复变发生，即为塑变。
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.
当材变超出弹变发生范围，其应力将不再与应变成正，永久、不可回复变发生，即为塑变。
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