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1、JOURNALOFBATTLEFIELDTECHNOLOGY,VOL1,NO1,MARCH19981SOMEMETALLURGICALASPECTSOFSHAPEDCHARGELINERSAlistairDoigAbstract.Thispaperreviewsthetraditionalselectioncriteriaforshapedchargeliners,anddemonstratessomeconfusionsthatarise.Whenconsideringpossiblenewlinermaterialsitisproposedthatmeasure
2、mentofdynamicmechanicalproperties,ratherthantheusualmorereadilyavailablestaticdata,wouldbehelpful,particularlytomathematicalmodellers.ShapedchargeisindeedanextraordinaryphenomenonthatINTRODUCTIONisbeyondthescaleofnormalphysics,whichexplainswhyTheShapedChargeJetitsfundamentaltheoretical
3、mechanismisbynomeansfullyunderstood.Thefirstsectionofthispaperreviewswhatisexpectedfromaconicalshapedchargeliner.AsillustratedinFigureTheExplosivelyFormedProjectile(EFP)1,theshapedchargejettipreaches10kms-lsome40µsWideangleconesandotherlinershapessuchasplatesorafterdetonation,givingaco
4、netipaccelerationofabout25dishesdonotjet,butgiveinsteadanexplosivelyformedmilliong.projectileorEFP,asillustratedinFigure3.Theprojectileformsbydynamicplasticflowandhasavelocityof1-3kms-l.Targetpenetrationismuchlessthanthatofajet,buttheholediameterislargerwithmorearmourbackspall.Initiati
5、onHE*Figure1.FlashX-rayofacollapsingcoppercone.Figure3.Stagesinthedevelopmentofanexplosivelyformedprojectile.Atthisaccelerationthetipwouldreachthespeedoflight,werethispossible,inaround1.5seconds.Butofcourse,itHydrodynamicFlowreachesaterminalvelocityafteronly40millionthsofaItisuniversal
6、lyagreedthatconicallinercollapseandtargetsecond.Itisdifficulttothinkofanyotherterrestrialeventpenetrationbothoccurbyhydrodynamicflow.However,itasfastasashapedchargejettip.ThejettailhasavelocityhasbeenestablishedbyX-raydiffractionthatthejetisof2-5kms-landso,asillustratedinFigure2,thejet
7、solidmetalandnotmolten.Additionally,bestestimatesofstretchesouttoalengthofabout8conediameters(CDs)jettemperaturebyincandescencecoloursuggestameanbeforeparticulationoccurs.valueofabout450°C,andcoppermeltsat1083°Catatmosphericpressure.Sothefollowingconundrumisthefirstconfusion:Thejetap
