As this toughened internal stress is a kind of permanent stress, it can not produce the internal stress attenuation with elongation of the product service time.
由于这种钢化内应力是一种永久应力，随着产品运行时间的延伸，它不会产生内应力衰减现象。
As this toughened internal stress is a kind of permanent stress, it can not produce the internal stress attenuation with elongation of the product service time.
由于这种钢化内应力是一种永久应力，随着产品运行时间的延伸，它不会产生内应力衰减现象。
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