超弹性形状记忆合金丝力学性能试验(2)

第26卷阎石等：超弹性形状记忆合金丝力学性能试验463

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ExperimentalResearchonMechanicalPerformancefor

Pseudo-ElasticityofShapeMemoryAlloy

YANShi，WANGQi，WANGWei

（SchoolofCivilEngineering，ShenyangJianzhuUniversity，ShenyangChina，110168）

Abstract：Inthispaper，thebasicmechanicalpropertiesofshapememoryalloys（SMAs）areresearchedbythemethodofcyclictension，whichcanbeusedforthedesignofdamperswiththeSMAs.Cyclenumber，loadingrateandpeakstrainareconsideredtoinvestigatetheireffectsonthemechanicalparametersofSMAs

dampingandresidualstressbythecyclictensiontest.Theexperimentalsuchasthestress-strainrelationship，

resultswerecomparedwiththemodelofGrasser′stheory.Themajorinfluencedparameters，lawsandresultsforthepseudo-elasticity（PE）performanceoftheSMAsareresearched.Theresultsshowedthat，atacertain

loadingrate，withthecyclenumberincreasing，thestress-straincurvesaregradualdownwardandthecurves

thephasestressanddampingoftheSMAwirestabilizeafter20cycles.Withthecyclenumberincreasing，

willbegettingdecreased，buttheresidualstresswillincreaseandtrendtostabilize.Theloadstrainisfaster，theenergydissipationcapacityislower.Withthestrainamplitudeincreasing，theenergydissipationcapacityandequivalentdampingoftheSMAsapproximatelylinearincrease，andthemodulusdecrease.Butthestrainamplitudehaslessimpactonthephasestress.SMAwires，whichareidealmaterialformakingdamper，canbehavestablestress-strainrelationshipandenergy-dissipationcapacityafteranumberofloadingcirculations.

Keywords：shapememoryalloy；pseudo-elasticity；circulationtensileexperiment；hystereticmodel；loading

rate

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