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针对管道衬盘裂纹问题,利用有限元分析方式对其受载进行强度校核,并通过化学成分、硬度、宏观和显微组织等对其裂纹产生的原因进行分析。结果表明,坯件加工不当和装配过紧造成组织表面氧化防护层破坏,暴露出来的铝基体不断与管道内流体发生电化学腐蚀反应,同时零件未经任何热处理工艺,内部晶粒组织粗大位错密度较低,对裂纹扩展阻碍有限,最终在长期交变载荷下微裂纹不断扩展,造成最终的疲劳腐蚀失效。
According to the problem of pipe liner crack, the strength of pipeline was checked by finite element analysis, and the cause of crack was analyzed by chemical composition, hardness, macroscopic and microstructure. The results show that the improper processing of the blanks and the over-tight assembly lead to the destruction of the oxidized protective layer on the surface of the tissue. The exposed aluminum substrate continuously undergoes electrochemical corrosion reaction with the fluid in the pipeline, and the components are not subjected to any heat treatment process. The lower density and the limited resistance to crack propagation eventually lead to the development of micro-cracks under long-term alternating loads, resulting in the ultimate fatigue failure.