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循环载荷下AH32钢低周疲劳与累积塑性破坏交互作用试验研究（英文）.docx

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循环载荷下AH32钢低周疲劳与累积塑性破坏交互作用试验研究（英文） Title:ExperimentalStudyontheInteractionofLowCycleFatigueandCumulativePlasticFailureofAH32SteelunderCyclicLoading Abstract: Inthisstudy,anexperimentalinvestigationontheinteractionbetweenlowcyclefatigueandcumulativeplasticfailureofAH32steelundercyclicloadinghasbeenconducted.TheobjectiveofthisresearchistoinvestigatetheinfluenceofcumulativeplasticstrainonthelowcyclefatiguebehaviorofAH32steelandtoprovideexperimentaldataforthedevelopmentofanewfatiguelifepredictionmodel. TheexperimentalprogramincludedmonotonictensileteststoobtainthematerialpropertiesofAH32steel,andcyclicfatiguetestswithdifferentstressamplitudesandstrainaccumulations.Theload-controlledfatiguetestswereperformedundertotalstraincontrolwithasinusoidalwaveform,andthespecimenwascycleduntilfailure.Theresultswereanalyzedintermsoffatiguelife,cyclicdeformationbehavior,andfracturecharacteristics. TheresultsshowedthatthecyclicdeformationbehaviorofAH32steelundercumulativeplasticstrainwassignificantlydifferentfromthatundermonotonicloading.Theplasticdeformationcausedbythecyclicloadingwasgraduallyaccumulated,leadingtoaccelerationofcrackgrowth,ductilityreduction,andreductioninfatiguelife.ThefatiguelifeofAH32steeldecreasedwiththeincreaseofstrainaccumulation,andthelifepredictionmodelbasedontheCoffin-Mansonequationwasfoundtobeinadequateforthismaterial. Inaddition,itwasfoundthatthecrackinitiationandpropagationbehaviorundercyclicloadingwerealsoinfluencedbytheaccumulatedplasticstrain.Thesurfacemorphologiesofthefracturerevealedthatthefracturemodegraduallyshiftedfromtransgranulartointergranularwithincreasingstrainaccumulation,indicatingthetransitionfromductiletobrittlefailure. TheseresultssuggestthattheinteractionbetweenlowcyclefatigueandcumulativeplasticfailureshouldbeconsideredinthefatiguedesignofAH32steelstructures.MoredataandmodelsarerequiredtoaccuratelypredictthefatiguelifeandfailuremodesofAH32steelundercyclicloadingwithcumulativeplasticstrain. Keywords:AH32steel,lowcyclefatigue,cumulativeplas