Graded open-cell aluminium foam core sandwich beams梯度開孔泡沫鋁芯夾層梁

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1、MaterialsScienceandEngineeringA404(2005)918Gradedopen-cellaluminiumfoamcoresandwichbeamsArnaudPolliena,YvesCondea,LaurentPambaguianb,AndreasMortensena,?aEcolePolytechniqueF′ed′eraledeLausanne(EPFL),LaboratoryforMechanicalMetallurgy,InstitutDesMat′eriaux,Station12,MX-D141,CH-1

2、015Lausanne,SwitzerlandbEuropeanSpaceAgencyESA-ESTEC,MaterialMechanicsandProcessesSection,Keplerlaan1,P.O.Box299,NL-2200AGNoordwijkZH,TheNetherlandsReceivedinrevisedform1April2005;accepted1May2005AbstractWeshowthatthereplicationprocesscanbeextendedtowardstheproductionoffuncti

3、onallygradedporousstructuresbyfabricatingandtestingstructuresinwhichouterlayersofdensemetalencaseacentralpartmadeoffoamwithgradedporosity.SamplesofthiskindareproducedbypressingindividuallayersofNaClpowderofgranulometry6090
m,andthenstackingtheselayersbetweentwoskinsofdensealu

4、minium.Thestackedpreformsarethenin?ltratedwithpurealuminiumandsolidi?edbeforedissolutionofthesaltinwater.Specimenscontainingupto?velayersofporousAlofdifferentdensitybetweentwodenseouterskinsofpureAlareproduced;selectedsamplesaretestedinthree-pointbending.Datashowgoodagreement

5、withanalysisbasedonsandwichbeamtheoryandtheDeshpandeFleckyieldcriterion.Resultsofthisworkindicatethatwhereaslightweightgradedmetal/metalfoambeamsshowlittlepromisefromthestandpointofstiffness-limiteddesign,theymaybeofinterestfromthestandpointofload-limiteddesign.?2005ElsevierB

6、.V.Allrightsreserved.Keywords:Aluminium;Foam;Replication;Sandwich;Bending;Yield1.Introductionsive(e.g.,[10,14,17])orbycastingthemetalaroundthefoam(e.g.,[23,24]).WiththeexceptionofworkrecentlyreportedThereiscurrentlymuchinterestinmetalfoamsinlargeinRef.[21],closed-porefoamcore

7、sofhomogeneousdensitypartbecausesuchmaterialsarenowcommerciallyavail-havealwaysbeenusedinsandwichbeamstestedformechan-able[15].Targetstructuralapplicationsincludecomponentsicalproperties[13,17,2527].formechanicalenergyabsorption[68]andmoregenerallyPorousmaterialsarefrequentin

8、nature;woodandbonearelight-weightstructuralelements,suchassandwichst