论文对超声螺栓应力测量原理，超声螺栓紧固力测试仪设计进行了系统研究。
The thesis lucubrated the principle of ultrasonic bolt tension measurement and design of ultrasonic bolt tension measurement instrument.
[S-1] 在螺栓被初步紧固之后，由于垫片的缓慢蠕变或松弛，特别是采用的是“比较软的”垫片材料，则螺栓应力的下降是可能的。
It is possible for the bolt stress to decrease after initial tightening, because ofslow creep or relaxation of the gasket, particularly in the case of the "softer" gasket materials.
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。
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.
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