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轴向载荷下多平面DT型管节点应力集中系数概率模型研究（英文）.docx

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轴向载荷下多平面DT型管节点应力集中系数概率模型研究（英文） ResearchonProbabilityModelofStressConcentrationCoefficientofMulti-PlaneDTPipeJointsunderAxialLoad Abstract: DTpipejointsplayanimportantroleintheconstructionofpipelines,andthestressconcentrationcoefficientisanimportantindextoevaluatethestructuralperformanceofDTpipejoints.Inthispaper,aprobabilitymodelofstressconcentrationcoefficientofmulti-planeDTpipejointsunderaxialloadisestablishedbasedonthetheoryofprobabilitystatistics.Thefactorsaffectingthestressconcentrationcoefficientareanalyzed,andthemodelisverifiedbysimulation.TheresearchresultsprovideatheoreticalbasisfortheoptimizationdesignofDTpipejoints. Keywords:DTpipejoints,stressconcentrationcoefficient,probabilitymodel,axialload 1.Introduction DTpipejointsarecommonlyusedintheconstructionofpipelinesduetotheireaseofinstallationandhighstrengthandstability.StressconcentrationphenomenonisacommonprobleminthedesignandconstructionofDTpipejointsunderaxialload,whichoftenleadstothefailureofDTpipejoints.ThestressconcentrationcoefficientisanimportantindextoevaluatethestructuralperformanceofDTpipejoints,anditsaccuratecalculationisofgreatsignificancefortheoptimizationdesignofDTpipejoints. Inthispaper,basedonthetheoryofprobabilitystatistics,aprobabilitymodelofstressconcentrationcoefficientofmulti-planeDTpipejointsunderaxialloadisestablished.Thefactorsaffectingthestressconcentrationcoefficientareanalyzed,andthemodelisverifiedbysimulation.TheresearchresultsprovideatheoreticalbasisfortheoptimizationdesignofDTpipejoints. 2.ProbabilityModelofStressConcentrationCoefficient 2.1BasicTheoryofProbabilityModel Thestressconcentrationcoefficientisarandomvariable,whichisaffectedbymanyfactorssuchasgeometricshape,materialproperties,andloadingconditions.Theprobabilitymodelofstressconcentrationcoefficientisestablishedbasedonthetheoryofprobabilitystatistics,whichdescribesthedistributionlawofstressconcentrationcoefficientinacertainprobabilityrange. Theprobabilitymodelcommonlyusedinengineeringisthenormaldistributionmodel,whic