We think that the method of estimating maximal pre-applied stress of the working bolt can provide a reference for preventing further fatigue fracture of boxter bolts.
认为用估算螺栓工作时的最大预紧应力的方法，对防止埋头螺栓疲劳断裂再次重复发生有一定的参考价值。
On the basis of relationship between bolt axial stress and rate of change in ultrasonic wave transmission time, the author has developed a device to directly measure axial stress in bolts.
根据螺栓的轴向应力与超声波传播时间变化率的关系，作者研究了一种可直接测量螺栓轴向应力的仪器。
The composite stress factor and pre-tensile force loss of the two diameter high strength bolts of M27 and M24 are experimentally determined in the paper.
本文对M27和M24两种直径高强度螺栓进行了复合应力系数测定和预拉力损失试验。
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