When hydride reorientation takes place, there is a threshold stress concerned with the number of temperature cycling.
随着应力增大和温度循环次数增加，氢化物再取向程度也增大，但是氢化物发生再取向存在应力阈值。
A distribution function of two dimensional threshold is given for fatigue crack propagation. A two dimensional stress threshold interference model is set up.
本文给出二维疲劳裂纹扩展门槛值分布函数，建立二维应力—门槛值干涉模型。
The initially existing damage has apparently affected on wave stress propagation and stress distribution as long as its quantity exceeds a threshold value.
当初始损伤超过某临界值后会显著地影响应力波的波动范围和围岩应力分布；
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