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考虑累积塑性的船体裂纹板变幅低周疲劳裂纹扩展行为研究（英文）.docx

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考虑累积塑性的船体裂纹板变幅低周疲劳裂纹扩展行为研究（英文） ResearchonLow-CycleFatigueCrackPropagationBehaviorofShipHullCrackPlatesAccumulatedbyPlasticStrain Abstract: Thefatiguecrackpropagationbehavioroftheshiphullcrackplatesaffectedbythecumulativeplasticstrainhasbeenstudiedinthispaper.Theresearchisbasedonthelow-cyclefatiguecrackpropagationtestandfiniteelementsimulationanalysis,whichprovidesareliablebasisforthefatiguelifepredictionandsafetyassessmentoftheshiphull. Introduction: Asthemainload-bearingpart,theshiphullcrackplatesplayasignificantroleinensuringthesafetyandreliabilityofmarineequipment.Inpractice,fatiguecracksalwaysoccurintheshiphullplatesduetovariousfactors,suchascyclicloads,vibration,andcorrosion.Amongthem,low-cyclefatiguecracksarethemostcommontypeofcrackthataffectsthestructuralsafetyofships.Intheprocessofcrackpropagation,theaccumulationofplasticstrainwillleadtoasignificantimpactonthefatiguecrackpropagationbehavioroftheshiphullplates.Therefore,itisofgreatsignificancetostudythelow-cyclefatiguecrackpropagationbehavioroftheshiphullcrackplatesaccumulatedbyplasticstrain. ExperimentalProcedure: Thelow-cyclefatiguecrackpropagationtestwasperformedusingcompacttension(CT)specimens.Thespecimensweremadeofhigh-strengthsteelandsubjectedtocyclicloadsthroughaservo-hydraulicuniversaltestingmachine.Acrackgaugeandstraingaugewereattachedtothespecimentomeasurethecracklengthandplasticstrain,respectively.Thefatiguecrackpropagationratewascalculatedbasedonthemeasureddata. FiniteElementSimulation: Basedontheexperimentaldata,afiniteelementmodeloftheCTspecimenwasestablishedtosimulatethestressdistributionanddeformationduringthefatiguecrackpropagationprocess.Thecrack-tipstressintensityfactor(SIF)wascalculatedusingtheJ-integralmethod,andthecrackgrowthratewaspredictedbytheParislaw.ThecrackpropagationsimulationwascarriedoutusingtheANSYSsoftware. ResultsandDiscussion: Theresultsshowthatthecumulativeplasticstrainhasasignificantimpactonthefatiguecrackpropagationbehavioroftheshiphullcrackplates.Thecrackgrowthrateincrea