泡沫鋁填充薄壁圓管三點彎曲力學(xué)行為研究

1、中國科學(xué)技術(shù)大學(xué)碩士學(xué)位論文泡沫鋁填充薄壁圓管三點彎曲力學(xué)行為研究姓名：謝中友申請學(xué)位級別：碩士專業(yè)：工程力學(xué)指導(dǎo)教師：虞吉林20070501AbstractMetallicfoamsareengineeringmaterialswhichhavesomespecialcharacteristicsuchaslowdensity，highspecificstrengthandstiffness，superiorcapabilityofe

2、nergyabsorption，soundinsulation，heatinsulation，erosionresistance，andtheyareappliedmoreandmorewidelyinmilitaryandcivilstructuresBecausemetallicfoamscanremarkablyenhancemechanicalperformanceofthinwalledstructures，moreatten

3、tionispaidtothin—walledstructuresfilledwithmetallicfoamThin—walledcylindricaltubesarecommonlyusedaslightstructuresofbearingweight，andbendingbehaviorofthin—walledcylindricaltubesfilledwithmetallicfoamisalittlestudiedThepa

4、permainlyinvestigatesthree—pointbendingdeformationmodesandmechanicalpropertyofthin—walledcylindricaltubefilledwithmetallicfoamsunderstaticanddynamicalloadingexperimentallyMoreover，experimentalresultsaresimulatedwiththeus

5、eofABAQUSsoftwareFirstly，experimentalresultsindicatethataluminumfoamsfillerchangesdeformationmodesofhollowstructuresincludingresistingtheflatteningofcrosssectionanddecreasinglocalindentationAfterfilledwithaluminumfoamsst

6、ructuraldeformationislimitedinsmalldomainbelowthepuncherandfielddisplacementtendstowardstriangledistributionAtlast，structuresfilledwithfoamcollapsebyrippingattheloweredgeoftubularwallMoreoverfillingaluminumfoamgreatlyimp

7、rovesbearingcapacitywhichcanachievelargerrangeofdisplacementSecondly，three—pointbendingtestsofstructuresunderlowvelocityimpactareconductedDeformationmodesofthesamestructuresunderbothlowvelocityimpactandquasi—staticloadin

8、garesimilarImpactforceofdrophammerarecommonlyhigherthanthatobtainedunderquasistaticloading，andapartofexternalworktransformstokineticenergyofstructuresThirdly，anumericalmodelfortheexperimentsisestablishedandthebendingresp