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
超出弹性发生范围，其
不再与成正
，永久、不可回复发生，即为塑性。
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.
当材料超出弹性发生范围，其不再与成正，永久、不可回复发生，即为塑性。
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