双相钢DP600高应变率力学本构模型研究及车身结构轻量化

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1、上海交通大学博士后学位论文双相钢DP600高应变率力学本构模型研究及车身结构轻量化姓名：余海东申请学位级别：博士后专业：机械工程指导教师：林忠钦20060601摘蛰ABSTRACTWiththeshortageoftheenergyandtheenhancedconsciousnessoftheenvironmentprotection，thelightweightoftheautomobilewillbethemaindevelopingtendency．Inthedesignphaseoftheautomobile，thenumericalsim

2、ulationonthecrashworthiness，stillness，fatigueandNVH(noise，vibrationandharshness)isagoodmeasuretOshortentheperiodofthedesign．Italsocanreducethephysicaltestsandsavetheinvestment．However,therearemanyimportantfactorstoinfluencethecorrectionofthenumericalresultssuchasthequalityofthe

3、finiteelementmodel，theconstitutivemodelforthematerials，connectionmodebetweenthepartsandSOon．ToordertoestablishtheconstitutivemodeltOdescribethemechanicalbehaviorofthematerialsinthecrashprocedure，thetensileexperimentathighstrainrateandlowhighstrainratewereconductedinthispaper．Ac

4、cordingtotheexperimentalresults，thestrainrateeffectandtheanisotropicbehaviorwerediscussed．ThentwoconstitutivemodelsfortheDP600takingaccountofthestrainrateeffectwereestablishedbasedonthegeneralconstitutivemodelfittingtotheductilematerials．TheyaremodifiedKhan—HuangmodelandhybridJ

5、C-KHmodel，respectively．Thecomparisonforthetwomodelswasintroduced．Then，theintegralequationforthemodifiedKhan-Huangconstitutivemodelwasgiven．TheusermaterialsubroutinelinkedwiththefiniteelementsoftwareABAQUSwaspresented．Thetensilesimulationforthespecimensatstrainrate500s～，ll00s。1a

6、nd1600s～wereconductedtoverifythecorrectionoftheconstitutivemodel．Theresultsshowthattheconstitutivemodelandtheusermaterialsubroutinecandescribethemechanicalbehaviorsofthedualphasesteel600attherangeofthestrainratefrom10_4s’1to103S～．Thisconstitutivemodelcanbeemployedtodescribethem

7、echanicalbehaviorofthehighstrengthsteelinthesimulationofthecrashprocess．Whenthedesignprinciplesforthecrashworthiness，fatigueandstiffnessaresatisfied，thebehaviorofthenoise，vibrationandharshnesswillhasgreatinfluenceonthequalityoftheautomobile．Itisveryinterestingworkthatthebehavio

8、rofthecrashworthiness，fatigue，stiffnessandNVHCansustai