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:
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AnalysisofCrackInitiationandGrowthinPBXEnergeticMaterialusingXFEMbasedCohesiveMethod
HUANGXicheng1,LIShangkun1,WEIQiang1,TIANRong2,CHENChengjun1,WANGLixiang2,LIUMing1
(1.InstituteofSystemsEngineering,CAEP,Mianyang621999,China;2.CAEPSCNS,Beijing100088,China)
Abstract:Theextendedfiniteelementmethod(XFEM)isappliedtoanalyzethecrackingfailuremechanismofthewholeprocessfromlocalcrackinitiationtocrackgrowth,inthePBX9502platelikespecimenwithcavitysubjectedtooverallcompression.ThenonlinearconstitutivebehaviorsandfailureofPBXundercomplexstressstatesweredescribedbymeansofstressstatedependentstrengthsurface,nonassociatedflowruleandcohesivemodel.ComparisonbetweenthenumericalsimulationresultsandLosAlamosNationalLaboratory(LANL)testoneswascarriedout.Resultsshowthattheplatewithcavityproducelocaltensilestressaroundcavityintheoverallcompressionenvironmentandthistensionconditionleadstolocalcrackinginitiation.Theoveralldevelopmenttrendofnumericalsimulationforcrackingisinagreementwithexperimentalresults,includingoveralltrendofcrackhistory,featureofcracktimecurve,crackinitiationmoment,crackinitialspeed,etc.BasedontheXFEM andcohesivemodelmethod,thecrackinitiationandgrowthofPBXenergeticmaterialscanbesimulated.Keywords:extendedfiniteelementmethod(XFEM);cohesivemodel;polymerbondedexplosive;crack;growth;mechanismCLCnumber:TJ55;O34 Documentcode:A DOI:10.11943/j.issn.10069941.2017.08.013
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