泡沫鋁填充薄壁圓管三點彎曲力學行為研究.pdf

1、中國科學技術大學碩士學位論文泡沫鋁填充薄壁圓管三點彎曲力學行為研究姓名：謝中友申請學位級別：碩士專業(yè)：工程力學指導教師：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