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冲洗阀出现进水端连接螺母纵向断裂。采用宏、微观、扫描电镜、化学分析、应力测定及计算等方法对断裂螺母进行了分析。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。
Flushing valve appears inlet end of the connecting nut longitudinal rupture. Breaking nuts were analyzed by macro, micro, SEM, chemical analysis, stress measurement and calculation. The results show that the existence of a variety of nut casting and processing macroscopic and microscopic observation of defects and residual stress is too high nuts failure rupture causes.