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
形变
范围，其应力将不再与应变成正
，永久、不可回复形变，即
形变。
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.
当材料形变超出弹形变范围，其应力将不再与应变成正，永久、不可回复形变，即形变。
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