Under the action of tensile stress and tensile stress, the bolt with relatively low strength will crack first, and then the fatigue fracture will occur.
在拉应力和应拉力交替的作用下,强度相对较低的螺栓会先产生裂纹,进而发生疲劳断裂。
2
Longitudinal crack of drill pipe box joint is brittle fracture at lowstress.
钻杆接头的各种纵向开裂属于低应力脆性断裂。
3
Fracture morphology is more rough in room temperature, low fatigue stress and more fatigue cycles, but the length of fiber pullout is longer.