结果表明，螺母存在多种铸造及加工的宏观、微观观察缺陷和残余应力过高是螺母断裂失效的原因。
Experiment results showed that the fracture of the nut was originated from a variety of macro defects, micro defects both by founding and machining, as well as high residual stress.
测量材料微区残余应力的大小和分布，对于研究微观断裂机制具有非常重要的意义，一直是研究的热点和难点。
The measurement of the value and distribution for micro-residual stress in materials was crucial and difficult for micro-fracture theory.
它的使用可以有效地去除毛刺，降低表面粗糙度值，棱边倒圆，改善表面残余应力状况，提高表面硬度，大幅度减少微观缺陷。
It may be used effectively in deburring, reducing the value of surface roughness, chamfering. improving conditions of surface residual stress and surface hardness and reducing greatly microdefects.
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