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1、滨州学院本科毕业设计(外文翻译)毕业设计（外文翻译）英文题目DevelopmentofaDeflectionControlledMultlaxlalFatigueTestingMaching中文题目偏心控制的多轴疲劳试验机设计系（院）机电工程系专业机械设计制造及其自动化学生姓名学号指导教师职称二〇一六年三月15滨州学院本科毕业设计(外文翻译)15滨州学院本科毕业设计(外文翻译)15滨州学院本科毕业设计(外文翻译)DevelopmentofaDeflectionControlledMultlaxlalF
2、atigueTestingMachingThispaperdiscussesthedevelopmentofamultiaxialfatiguetestigmachine.ThedeflectioncontrolledeccentricdisktypetestingmachineproducesmodeI,modeII,orcombinationofboth,ofcracksurfacedisplacementsonroundorflatspecimens.Theseloadingsarenecess
3、aryforresearchoncomplexmultiaxialstresseswhicharecommoninengineeringpractice,suchascrankshafts.Thismachineachievedtheobjectivewithverysimplemechanisms(vectorsumoftwocrankthrowsofeccentricdisksyieldbendingmoments;vectordifferences,twistingmoments),butwit
4、hmorecomputationinsettingthedesiredparameters.Bendingdataandtorsiondataproducedbythemachinewereingoodagreementwiththedatabyaconventionalfatiguetestingmachine.Multiaxialdataproducedbythemachinewerealsoingoodagreementwiththepredictionbyawellprovedmultiaxi
5、alfatiguetheory.Applicationsofthemultiaxialfatiguetestingmachinearedescribed.KeyWords：MultiaxialFatigue,Bending,Torsion,Out-of-Phase,DeflectionControlled,TestingMachine,DiscriminatingSpecimen1.INTRODUCTIONMostengineeringcomponentssuffermultiaxialcyclicl
6、oadings.Fatiguecrackinitiationandpropagationundermultiaxialloadingsshowdifferentbehaviorfromthoseofuniaxialloading.Fatiguelifepredictionofstructuresormachinepartsundermultiaxialloadingsisessentialtotheirreliabledesignandfailureprevention.Suchpredictionw
7、asoftenbasedonsimplelaboratorydatageneratedundercyclicuniaxialloading.ResearchbyBrownandMiller(l973),Krempl(1974),Lee(1980)andGarud(1981)indicatedthatuniaxialdataalonecannotbeapplieddirectlytothepracticalsituationsofcomplexmultiaxialfatigue,i.e.,movingp
8、rincipalaxesandnonproportionalloading.Manyfatiguetheoriesorcriteriahavebeenproposedbutnonewasgenerallyaccepted(Garud,1981;Lee,1985).Verylittleexperimentalworkhasbeendoneinthisfieldowingtothelackofpropermultiaxialfatiguetestingmac
