Impact loading of plates –– An experimental investigation

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1、Int.d.lmpaotEngng.Vol.l,No.l,pp.3-22,19830734-743X/010003-20503.00/0PrintedinGreatBritain©1983PergamonPressLtd.IMPACTLOADINGOFPLATES--ANEXPERIMENTALINVESTIGATIONR.S.J.Corran,P.J.ShadboltandC.RuizDepartmentofEngineeringScience,OxfordUniversity,ParksRoad,OxfordOXI3PJ,U.K.(Received28October1981;

2、inrevisedform6August1982)S~nmary-Theimpactofprojectilesatsub-ordnancevelocitiesagainstmildsteel,stainlesssteelandaltrainiumplates,hasbeenstudiedinaseriesofexperiments.Theprojectilemass,noseshapeandhardnesshavebeenshowntohavean~rtanteffectonpenetrationasdoesthetargetrigidityandsupportcondition

3、.Allmaterialsexhibitaclear'kink'effectrelatedtoachangefromenergyabsorptionbyplasticdeformationtoperforationwithwell-definedshearbandsandnoappreciablebulging.NOTATIONEmaterialelasticmodulusHlengthofconicalsectionoffrustrumM0fullplasticyieldmomentNOfullplasticmembraneforcePlimlimitelasticloadVv

4、elocityprojectilenoseradiusbeforemushrcx3minga0b0projectilenoseradiusaftermushroomingewidthofintenseshearzonearoundprojectileedgehplatethicknessrradius;re,clampradius;rp,projectileradiusWout-of-planedeflectionAelasticdeflectionYfshearstraintofailure£strain;Er,radialstrain;e0'circtmlferentials

5、train

6、ainmentofmissilesatsub-ordnancevelocitiessuchasshedturbinebladesinaero-engines,valve-stemsandotherfragmentsresultingfromanexplosioninprocessorpowerplant,etc.Typicallyimpactvelocitiesinthesesituationsdonotexceed300ms-l.Whilethefieldofordnancevelocityimpacthasreceivedconsiderable34R.S.J.Corrane

7、ta~.attention[I],thereislessinformationonsub-ordnanceimpactinthepublishedliterature.Asignificantfactorinsub-ordnanceimpactis-thehighpercentageofimpactenergyabsorptionawayfromthepointofimpactbymeansofplasticstructuralresponse.ZaidandTravis[2]a