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用表面裂纹法研究表面强化层的疲劳裂纹扩展抗力.docx

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用表面裂纹法研究表面强化层的疲劳裂纹扩展抗力 Title:StudyonFatigueCrackGrowthResistanceofSurfaceStrengtheningLayersusingSurfaceCrackMethod Abstract: Surfacestrengtheningtechniquesarewidelyusedtoimprovethefatigueresistanceofmaterials.Understandingthefatiguecrackgrowthresistanceofsurfacestrengtheninglayersiscrucialfordesigningandoptimizingsuchtechniques.Thispaperaimstoinvestigatethefatiguecrackgrowthresistanceofsurfacestrengtheninglayersusingthesurfacecrackmethod.Theexperimentalstudyinvolvesthepreparationofsampleswithsurfacestrengtheninglayers,theapplicationofdifferentloadingconditions,andthemeasurementofcrackgrowthrates.Theresultsshowthatthepresenceofsurfacestrengtheninglayersimprovesthefatiguecrackgrowthresistancebyinhibitingcrackinitiationandreducingcrackgrowthrates.Moreover,themicrostructuralanalysisrevealsthemechanismsresponsiblefortheenhancedcrackgrowthresistance. 1.Introduction(200words) Fatiguefailureisacommonprobleminstructuralcomponentsandisasignificantconcerninengineeringapplications.Surfacestrengtheningtechniques,suchasshotpeening,surfacemechanicalattritiontreatment(SMAT),andlasershockpeening,havebeenwidelyemployedtoenhancethefatigueresistanceofmaterials.Thesetechniquesintroducecompressiveresidualstressesandinducefavorablemodificationsinthemicrostructureofthesurfacelayers,whichcaninhibitcrackinitiationandimpedecrackpropagation.However,theunderstandingofthefatiguecrackgrowthresistanceofsurfacestrengtheninglayersisstilllimited.Thisstudyaimstofillthisknowledgegapandprovideinsightsintoimprovingthedesignandperformanceofsurfacestrengtheningtechniques. 2.ExperimentalMethodology(400words) 2.1SamplePreparation Sampleswithsurfacestrengtheninglayerswerepreparedusingdifferenttechniques,includingshotpeening,SMAT,andlasershockpeening.Theprocessparameters,suchasshotsize,intensity,duration,andlaserenergy,werecarefullycontrolledtoachievethedesiredsurfacecharacteristics. 2.2LoadingConditions Adedicatedfatiguetestingmachinewasusedtoapplycyclicloadingtothesamples.Variousloadingconditions,suchascons