第40卷第4期压力容器2023年4月doi:■■■■■■■■■■■■■■■■■■■■10.3969/j.issn.1001-4837.2023.04.005设计计算管道穿透斜裂纹应力强度因子计算崔远洋,李慧芳,钱才富,吴志伟(北京化工大学机电工程学院,北京100029)摘要:裂纹是引起管道开裂失效的主要原因,裂纹尖端应力强度因子是表征裂纹应力场强度的主要物理量,也是对管道进行安全评估时的主要依据之一,但管道不同于平板,有曲率影响,因此基于平板推导出来的裂纹尖端应力强度因子公式必须进行修正。为了准确计算管道上斜裂纹应力强度因子,建立了不同管道直径、不同裂纹倾角以及不同裂纹长度下的管道穿透斜裂纹有限元模型,并计算了裂纹尖端应力强度因子,在无限大板中心斜裂纹应力强度因子计算公式基础上,修正得到了管道穿透斜裂纹应力强度因子计算公式,这对于含裂纹管道安全评定有重要参考价值。关键词:管道;穿透斜裂纹;应力强度因子中图分类号:TH49;TH123文献标志码:ACalculationofthestressintensityfactorsofinclinedthrough-thicknesscracksonpipelinesCUIYuanyang,LIHuifang,QIANCaifu,WUZhiwei(CollegeofMechanicalandElectricalEngineering,BeijingUniversityofChemicalTechnology,Beijing100029,China)Abstract:Crackisthemaincauseofpipelinefracturefailure.Stressintensityfactoristhemajormechanicalparametertocharacterizethestrengthofthestressfieldsatcracktipsandthemainindicatorforpipelinesafetyevaluation.Unlikeinfiniteplates,thereexistcurvaturesofpipelines,sothecalculationformulaforthestressintensityfactorsoninfiniteplatesmustberevised.Inordertoaccuratelycalculatethestressintensityfactorsofinclinedcracksonpipelines,finiteelementanalysismodelsforpipelineinclinedthrough-thicknesscrackswithdifferentpipediameters,differentcrackinclinationanglesanddifferentcracklengthswereestablishedandthestressintensityfactorsatthecracktipswerecalculated.Thecalculationformulaofthestressintensityfactorsofinclinedthrough-thicknesscracksonpipelineswerefittedbymodifyingtheformulaofthestressintensityfactorsatthecenterofinfiniteplates,whichprovidevaluablereferencesforthesafetyassessmentofthepipelinescontainingcracks.Keywords:pipeline;inclinedthrough-thicknesscrack;stressintens...