某柴油发动机水泵总成失效分析

通过对水泵总成中发生断裂的轴承芯轴进行断口的宏观分析、微观分析和剖面分析,及其中各组件的相对位置、表面痕迹和宏观形貌的分析和讨论,分析失效原因,提出改进建议。结果表明:轴承芯轴属于扭转疲劳断裂;材质中存在着容易引起早期疲劳破坏的较严重的组织缺陷。水泵总成的失效除与材质的质量控制直接相关外,还与其结构设计、装配等因素有关。

Failure analysis of water pump assembly of a certain diesel engine

The fractured surface of bearing core shaft of a certain water pump assembly was investigated by means of macroscopic,microscopic and section fractography.The adjacent position,surface trace and macroscopic morphology of some subassemblies were analyzed and discussed.The aim is to find failure reasons and to put forward improvement measures.The results show that the failure of the bearing core shaft was a torsional fatigue.There existed more serious structure defects in material to cause an early fatigue failure.Failure of water pump assembly is related to the mechanical structure design and assemblage of parts and the quality control of material.