基于shpb实验的挤压az91d镁合金动态力学行为数值模拟

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1、第24卷第8期中国有色金属学报2014年8月Volume24Number8TheChineseJournalofNonferrousMetalsAugust2014文章编号：1004-0609(2014)08-1968-08基于SHPB实验的挤压AZ91D镁合金动态力学行为数值模拟1112周霞，赵昌美，李利，黄宏军(1.大连理工大学运载工程与力学学部工业装备结构分析国家重点实验室，大连116024;2.沈阳工业大学材料科学与工程学院，沈阳110870)摘要：使用霍普金森压杆技术对挤压AZ91D镁合金进行3种应变速率下的动态压缩实验，基于实验数据的拟合确定了

2、其动态压缩的Johnson-Cook(J-C)本构方程。采用拟合的J-C本构参数和LS-DYNA有限元软件对挤压AZ91D镁合金在3种应变速率下的SHPB实验进行了数值模拟，根据模拟得到的入射波、反射波和透射波形计算得到各应变速率下完整的应力−应变曲线，并与实验及拟合的应力−应变响应进行了对比。结果表明：当应变速率−1在400~1000s之间变化时，AZ91D镁合金的应变速率敏感性随应变率增大而增大；基于J-C材料模型描述的AZ91D镁合金应变速率相关的应力−应变本构模型，其数值模拟结果与拟合结果及实验结果基本吻合。关键词：挤压AZ91D镁合金；动态压缩实

3、验；本构行为；数值模拟中图分类号：O347.3文献标志码：ANumericalsimulationofdynamicbehaviorofextrudedAZ91DmagnesiumalloybasedonSHPBexperiment1112ZHOUXia,ZHAOChang-mei,LILi,HUANGHong-jun(1.StateKeyLaboratoryofStructuralAnalysisforIndustrialEquipment,DepartmentofEngineeringMechanics,FacultyofVehicleEngineer

4、ingandMechanics,DalianUniversityofTechnology,Dalian116024,China;2.SchoolofMaterialsScienceandTechnology,ShenyangUniversityofTechnology,Shenyang110870,China)Abstract:DynamiccompressionexperimentsofextrudedAZ91DmagnesiumalloyatthreedifferentstrainrateswerecarriedoutbasedonsplitHopki

5、nsonpressurebar(SHPB)technique,andaJohnson-Cookdynamicconstitutiveequationwasobtainedbyfittingtheexperimentaldata.TheSHPBdynamiccompressionofthematerialwassimulatedbyusingLS-DYNAsoftwarewiththefittedJohnson-Cookconstitutiveparameters.Calculatedincident,reflected,andtransmittedwave

6、swerecorrelatedwiththestress−strainresponseoftheextrudedAZ91Dsampleusingtwo-waveanalyticalmethod;thestress−straincurvesatdifferentstrainratesobtainedinthesimulationswerecomparedwiththeexperimentalandfittedstress−strainresponses.Theresultsshowthatthestrainratesensitivityoftheextrud

7、edAZ91DMgalloyincreases−1−1withincreasingthestrainratefrom400sto1000s.ThenumericalsimulationresultsandfittedresultsbasedontheJohnson-Cookstrain-ratedependentconstitutivemodelfortheextrudedAZ91DMgalloyarebasicallyinagreementwiththeexperimentalresults.Keywords:extrudedAZ91DMgalloy;d

8、ynamiccompressionexperiment;const