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1、第2届全国工程安伞与防护学术会议论文集ii昌昌宣i若暑ii;;奄葺ii昌mm——————————————————一——mm一——in蔷暑;;;莓ii置i墨肓;;昌;;;暑;薯考虑质量损失的弹体侵彻过程分析何丽灵1’2沈俊3陈小伟1何翔3‘中国工程物理研究院总体工程研究所,四川省绵阳市919信箱401分箱.6219002中国科学技术大学近代力学系,安徽省含肥市四号信箱,2300273.总参工程兵科研三所,河南,洛阳.471023摘要:常见防御工事一般由混凝土与岩石组成,动能弹对其侵彻过程的研究十分必要
2、。局限于试验技术,现有部分侵彻特征量获得存在困难,如质量损失与弹头形状时间历程等。在空腔膨胀与动量定理基础上,采用迭代计算方法,引入弹头钝化效应,获得弹体侵彻混凝土靶的特征量,包括侵彻时间,弹体侵深、加速度、质量损失、质量损失率和弹头形状的时间历程。计算结果与试验结果吻合.引入质量损失后.因弹头形状随侵彻进行不断钝化,弹体的减速度发展趋势较刚性弹发生改变,在隧道阶段先增加、后减小。与剐性弹差别剧烈程度不随撞击速度增加改交,由弹、靶组合决定.关键词:迭代计算,高速正侵彻,加速度,质量损失,弹头钝化,动
3、能弹,混凝土AnalysesofthePenetrationProcessinConsiderationofMassLossLilingHelt2XiaoweiChenl7InstituteofStructuralMechanics,Ctu'naAcademyofEngineeringPhysics,月D.Box919-401.Mianyang,Sichuan,China,621900zDepartmentofModernMechanics,UniversityofScienceandTechnol
4、ogyofchma,P.o.Box4.Hefei,dnhui,China,230027Abstract:AstheconcreteorreekareusualIyusedasprotectivematerials,itiSnecessarytounderstandtheprocessofKineticEnergy(KE)penetratorpenetratingintothetargetscomposedbYthesematerials.However,somekeyparameters,sucha
5、stheinstantmasslossandvariationofnoseshapeoftheprojectile,etc.,whichdenotestheperformancesofprojectile,callhardlybeobtainedbyexperimentsuptonow.Basedonthedynamiccavity—expansiontheoryandmomentumtheory,thekeyparametersofprojectilepenetratingintoconcrete
6、target,i.e.,thepenetrationtimeandhistoriesofinstantDOP,deceleration,masslOSS,massIOSSrateandnoseshape,areiterativelyobtainedwithconsideringthenosebluntingefrect.Andtheiterativeresultsareconsistentwithexperimentalresults.Asthemass10SSbringsonthevariatio
7、nofprojectilenose.thedecelerationofprojectilehasdifferenttrends,firstlyincreasingandthendecreasingintunnelingstage,comparedtOthatofrigidprojectile,monotonouslydecreasingintunnelingstage.11ledifferencebetweentworesponsesofdecelerationsiSdeterminedbythec
8、ombinationoftargetandprojectilebutnotdependsontheimpactvelocityofprojectile.Keywords:IterativeCalculation,NormalPenen州ofl'Higll-speedImpactVelocity,Deceleration,MassLoss,NoseBlunting,KEPenetrator,Concrete1引言常见防御工事一般由混凝土与岩石组成,因此,为了更好地防护(