SiC-Al梯度功能材料的高溫蠕變性能分析.pdf

1、同濟大學(xué)航空航天與力學(xué)學(xué)院碩士學(xué)位論文SiCAl梯度功能材料的高溫蠕變性能分析姓名：楊金順申請學(xué)位級別：碩士專業(yè)：固體力學(xué)指導(dǎo)教師：程軍20090301AbstractFunctionallygradientmaterial(FGM)isanewtypeofcompositewithbroadapplicationtomanyfieldssuchasaerospaceengineering，nuclearreaction，interna

2、lcombustionenginenowadaysItimprovesjointstrengthbetweentwodifferentmaterialswiththestructuralcharacterofcontinuoustransitionSiC／A1metalmatrixcompositeshasbeenfocusbymangresearchersforitsexcellentcapabilityofreducingtherm

3、alstressThecreeppropertiesofmaterialsatahightemperaturemustbeconsidered，formaterialpropertiesatlongtermhightemperaturearechangedwithtemperatureandthestressofcomponentiSredistributedduetothedoubleimpactoftemperatureandtim

4、eSiC／A1FGMthatusedintheground—toairmissilegashelmwillbestudiedonthecreepstrainandstressstateinthispaperbynumericalcalculationsoftware，whichwouldprovideinformationfortheapplicationofthismaterialinengineeringInthispaperthe

5、creepexperimentaldataofhightemperaturematerialsathomeandabroadwerecollectedfirstlyTheprocessofthere—pointbendingofSiC／A1FGMwiththeinitialcrackunderthethermalloadandmechanicalloadcouplingwiththermalloadWassimulatedbynumer

6、icalcalculationsoftware，andthecreeppropertiesofcompacttensionspecimenwiththeinitialcrackwasalsostudied，tostudytheimpacttocreeppropertiesofcomponentwithinterfacecracklocation，macro—crackoncomponentAnewcreepmodelWaswroteni

7、nnumericalcalculationsoftwareANSYSbvthesecondarydevelopmentfunction，whichwasusedtoachievethefiniteelementnumericalsimulationofthecreeppropertiesathightemperatureThenewcreepmodelWascomparedwithANSYScreepmodelinitsownAndth

8、enbythenewcreepmodeldevelopedinANSYS，thecreeppropertiesofmissilegashelmofSiC／A1FGMWasanalyzedandresearched，thecreepstraincurvesofthewholeprocessofmissilegashelmspecimenWasachieved，andthecreepdeformationbetweendifferentla