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.
当材料的形变超
形变发生的范围，其应力将不再与应变成正
，永久的、不可回复的形变发生，即为塑形变。
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.
当材料的形变超形变发生的范围，其应力将不再与应变成正，永久的、不可回复的形变发生，即为塑形变。
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上例句、词
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