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.
通过加载和卸载过程中所得到磁声发射强度的变化规律，可用以评估材料中微观损伤及残余应力。
The intensities of MAE have been measured as a function of the stress during loading and unloading, which can be used to evaluate the micro-damage and residual stress in ferromagnetic materials.
微观分析表明，表层硬相化合物的形成及晶粒细化是材料表面耐磨性提高的主要原因，残余压应力的增加也表明抗疲劳性得到提高。
The microanalysis results reveal that some new hard phases are formed and some crystalline grains are refined in the surface layers. All these are the main factors to improve...
微观分析表明，表层硬相化合物的形成及晶粒细化是材料表面耐磨性提高的主要原因，残余压应力的增加也表明抗疲劳性得到提高。
The microanalysis results reveal that some new hard phases are formed and some crystalline grains are refined in the surface layers. All these are the main factors to improve...
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