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考虑塑性损伤的船体裂纹板低周疲劳裂纹扩展行为研究（英文）.docx

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考虑塑性损伤的船体裂纹板低周疲劳裂纹扩展行为研究（英文） Abstract Inthemaritimeindustry,shiphullsaresubjecttovariousformsoffatiguecracksduetothedynamicnatureofseawaterandothermarineelementsencounteredduringvesseloperations.Plasticdeformationisacommonformofdamageinshiphulls,whichseverelyaffectstheintegrityoftheship.Thisstudyaimstoinvestigatethebehavioroflow-cyclefatiguecrackpropagationonplasticdamagedshiphulls.Thestudyreliesonexperimentsandfiniteelementsimulationstoidentifythemechanismsofcrackgrowthandtoproposemeasurestomitigatethedamagesarisingfromplasticdeformation. Introduction Inmodernshipping,fatiguedamageaccountsforasignificantproportionoftheaccidentsandfailuresthataffectmarinestructures.Amongthevariouscausesoffatiguedamage,plasticdeformationisacriticalfactorthataffectsthefatigueresistanceofshiphulls.Plasticdeformationisinitiatedwhentheappliedloadingonthestructuralmemberexceedstheyieldstrengthofthematerial,therebycausingpermanentplasticstrains.Plasticdeformationleadstotheinitiationandgrowthoffatiguecracksinshiphulls,whichcanresultincatastrophicconsequencesifleftuntreated.Therefore,itiscrucialtostudythebehavioroflow-cyclefatiguecrackpropagationinplasticdamagedshiphulls. Methodology Thestudyinvolvesexperimentalandcomputationalinvestigationstoanalyzethebehaviorofplasticdamagedshiphullsundercyclicloading.Theexperimentsinvolvedaseriesofuniaxiallow-cyclefatiguetestsconductedonspecimensofplasticdamagedaluminumalloyandmildsteelplateswithvariousdegreesofplasticdeformation.Thefatiguecrackpropagationwasmonitoredusingthedigitalimagecorrelation(DIC)techniqueandcross-sectionalanalysisbasedonscanningelectronmicroscopy(SEM).Meanwhile,finiteelementsimulationswereperformedusingtheANSYSsoftwaretomodelandanalyzethecrackpropagationbehaviorintheplasticdamagedstructures.Thesimulationresultswerevalidatedagainsttheexperimentalobservationsobtainedfromthelow-cyclefatiguetests. ResultsandDiscussion Theexperimentalresultsrevealedareductioninfatiguelifeforspecimenswithincreasinglevelsofplasticdeformation,regardlessoft