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
Some characteristics of the rolls, such as strength vs. Thermal shock, tensilestrength and contact fatigue strength, influence spalling. Thus, strength was investigated as a hardness parameter.
Simple tensile tests and low-cycle fatigue tests under stress control at different temperature were conducted to investigate the effects of temperature on fatigue behavior and fatigue strength.