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1、InternationalJournalofImpactEngineering22(1999)829}854Crashworthinessofaluminiumextrusions:validationofnumericalsimulation,e!ectofmassratioandimpactvelocityM.Langseth*,O.S.Hopperstad,T.BerstadDepartmentofStructuralEngineering,TheNorwegianUniversityofScienceandTechno
2、logy(NTNU),N-7034,Trondheim,NorwayReceived14September1998;receivedinrevisedform19December1998AbstractBasedonanexperimentaldatabaseobtainedfromstaticanddynamictestsonsquarealuminiumextrusionsinalloyAA6060tempersT4andT6,anumericalmodelusingtheLS-DYNAcomputercodewasval
3、idated.Excellentpredictionsoftheresponseofthetubeswerefoundbyusingisotropicelasticity,thevonMisesyieldcriterion,theassociated#owruleandnon-linearisotropicstrainhardening.Theplasticmaterialparameterssuchastheinitialyieldstressandthestrainhardeningweredeterminedfromun
4、iaxialtensiletests.Thegeometrywasmodelledusingshellelementsandasmalltriggerintheextrusionside-wallrepresentedtheinitialgeometricalimperfections.Thevalidatedmodelwasusedtostudytheresponseofsquarealuminiumtubes,varyingthemassoftheprojectileandtheimpactvelocity.Thesimu
5、lationsshowedthatthemeanloadwasanincreasingfunctionwithrespecttoanincreaseintheimpactvelocityandthatthemassratiobetweentheprojectileandspecimenhadnoin#uenceonthisresponseparameter.(1999PublishedbyElsevierScienceLtd.Allrightsreserved.Keywords:Aluminium;Extrusions;Cra
6、shworthiness;Numericalsimulations;Static;Dynamic1.NotationbwidthofextrusionC,Q,C,Qmaterialconstants1122Fstaticforce4Fdynamicforce$Fdynamicmeanforce.$*Correspondingauthor.Tel.:#0047-73-594782;fax:#0047-73-594535;e-mail:magnus.langseth@bygg.ntnu.no.0734-743X/99/$-seef
7、rontmatter(1999PublishedbyElsevierScienceLtd.Allrightsreserved.PII:S0734-743X(98)00070-0830M.Langsethetal./InternationalJournalofImpactEngineering22(1999)829}854Fstaticmeanforce.4F4initialbucklingload,simulation#3F%initialbucklingload,experiment#3F4staticmeanload,si
8、mulation.4F%staticmeanload,experiment.4F&4dynamicmeanloadatmaximumdisplacement,simulation.$F&%dynamicmeanloadatmaximumdisplacement,experim
