Low velocity impact behavior of composite sandwich panels

夹心板的低速冲击

Composites:PartA36(2005)1389–1396

/locate/compositesa

Lowvelocityimpactbehaviorofcompositesandwichpanels

PatrickM.Schubel*,Jyi-JiinLuo,IsaacM.Daniel

RobertR.McCormickSchoolofEngineeringandAppliedScience,CenterforIntelligentProcessingofComposites,

NorthwesternUniversity,2137TechDrive,Evanston,IL60208,USA

Received24June2004;revised23October2004;accepted22November2004

ThispaperissubmittedinhonorofProfessorJackR.VinsonoftheUniversityofDelaware.ThisisatributerecognizingProf.Vinson’soutstandingandenduringcontributionstothe eldofcompositematerialsingeneralandmorespeci callytostructuralapplicationsofcompositesandcompositesandwich

structures.Inaddition,oneoftheauthors(Daniel)feelsprivilegedandthankfultoProfessorVinsonforhispersonalfriendship.

Abstract

Compositesandwichstructuresaresusceptibletolowvelocityimpactdamageandthoroughcharacterizationoftheloadinganddamageprocessduringimpactisimportant.Theobjectiveofthisworkistostudyexperimentallythelowvelocityimpactbehaviorofsandwichpanelsconsistingofwovencarbon/epoxyfacesheetsandaPVCfoamcore.Instrumentedpanelswereimpactedwithadropmasssetupandtheload,strain,andde ectionhistorieswererecorded.Damagewascharacterizedandquanti edafterthetest.Resultswerecomparedwiththoseofanequivalentstaticloadingandshowedthatlowvelocityimpactwasgenerallyquasi-staticinnatureexceptforlocalizeddamage.Astraightforwardpeakimpactloadestimationmethodgavegoodagreementwithexperimentalresults.Acontactforce–indentationrelationshipwasalsoinvestigatedforthestaticloadingcase.Experimentalresultswerecomparedwithanalyticaland niteelementmodelanalysistodeterminetheireffectivenessinpredictingtheindentationbehaviorofthesandwichpanel.q2005ElsevierLtd.Allrightsreserved.

Keywords:A.Carbon bercomposite;B.Impactbehavior;D.MechanicalTesting;Sandwichpanels

1.Introduction

Theuseofcompositesandwichstructuresisexpandingintheaerospaceandmarineindustries,aswellasinotherareaswherealightweightmaterialwithhighin-planeand exuralstiffnessisneeded[1].Theconceptbehindthesestructuresistheseparationofrelativelystiff,strongandthinfacesheetsbyalightweightandthicker exiblecore.Theproperdesignandapplicationofsandwichconstructiondependsonathoroughcharacterizationandunderstandingofnotonlythesandwichconstituentmaterials(facesheets,core,andadhesive),butalsoofthestructureasawholeunderquasi-staticanddynamicloadings.Sandwichstructuresareknowntobesusceptibletoimpactdamagebyforeignobjects[2,3].Thistypeofdamageandmorespeci cally,theresponseofcompositesandwichpanelsunderlowvelocity

*Correspondingauthor.Tel.:C18474917961.

E-mailaddress:p-schubel@northwestern.edu(P.M.Schubel).

1359-835X/$-seefrontmatterq2005ElsevierLtd.Allrightsreserved.doi:10.1016/positesa.2004.11.014

impact,isthefocusofthisstudy.Althoughtheinduceddamagemaynotbereadilyapparent,itseffectsonthestrengthandreliabilityofthestructurecanbequitedetrimental.Severalcommonfailuremodeshavebeenidenti ed,includingcoreindentation/cracking,facesheetbuckling,delaminationwithinthefacesheet,anddebondingbetweenthefacesheetandcore[4–6].

Becauseofitscomplexnature,positesandwichbeamshavebeenstudiedtocharac-terizefailureprocessesanddamage[7–11].Thistwo-dimensionalapproachsomewhatsimpli esanalysisandgivesacross-sectionalviewofthedamage.However,asandwichpanelcanprovideamorecompletedeformationanddamageresponse.Mostofthepreviousimpactresearchconductedonpanelshasfocusedontheanalysisofimpactdynamics,thecharacterizationofimpactdamage,andthedeterminationofthepost-impactmechanicalpropertiesofthecompositestructure[2].Awiderangeofmaterials,geometries,andfacesheetlayupshavebeenused[12–17]

.

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