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1、AnalysisoftheFragmentationofAlONandSpinelUnderBallisticImpact1ElmarStrassburgere-mail:elmar.strassburger@emi.fraunhofer.deIthasbeendemonstratedthatsignificantweightreductionscanbeachieved,comparedtoconventionalglass-basedarmor,whenatransparentceramicisuseda
2、sthestrikefaceonMartinHunzingeraglass-polymerlaminate.Magnesiumaluminatespinel(MgAl2O4)andAlONarepromis-ingcandidatematerialsforapplicationasahardfrontlayerintransparentarmor.Com-FraunhoferInstituteforHigh-SpeedDynamics,prehensive,systematicinvestigationso
3、fthefragmentationofceramicshaveshownthatErnst-Mach-Institute(EMI),themodeoffragmentationisoneofthekeyparametersinfluencingtheballisticresistanceAmChristianswuhr2,ofceramics.Inthestudydescribedhere,thefragmentationofAlONandthreetypesof79400Kandern,Germanyspi
4、nelwasanalyzed:twotypesoffinegrainedspinelwithnominalaveragegrainsizes0.6lmand1.6lmandabimodalgrain-sizedspinelwithlargegrainsof250lmsizeinafinegrain(5–20lm)matrixwereexamined.Theceramicspecimensof6-mmthicknessParimalPatelweregluedtoanaluminumbackingandimpac
5、tedwitharmorpiercing(AP)projectilesofcaliber7.62mmattwodifferentvelocities—850m/sand1100m/s.ThetargetswereJamesW.McCauleyintegratedintoatargetbox,whichallowedforanalmostcompleterecoveryandanalysisoftheceramicfragments.Differenttypesofhigh-speedcameraswerea
6、ppliedinordertoU.S.ArmyResearchLaboratory,visualizethedifferentphasesoffragmentformationandejection.Alaserlight-sheetillu-AMSRD-ARL-WM-MD,minationtechniquewasappliedincombinationwithhigh-speedcamerasinordertoAberdeenProvingGround,MD21005determinesizeandspe
7、edofejectedceramicfragmentsduringprojectilepenetration.Theapplicationofthevisualizationtechniquesallowedfortheanalysisofthedynamicsofthefragmentformationandinteractionwiththeprojectile.Asignificantdifferenceinthefragmentsizedistributionsofbimodalgrain-sized
8、spinelandAlONwasobserved.[DOI:10.1115/1.4023573]Keywords:fragmentation,ceramic,AlON,magnesiumaluminatespinel,high-speedphotography,laserlight-sheettechnique1Introductionsizes.Theydescribedthefractureprocessin
