Designation:C274−07StandardTerminologyofStructuralSandwichConstructions1ThisstandardisissuedunderthefixeddesignationC274;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisterminologycoverstermsnecessaryforabasicuniformunderstandingandusageofthelanguagepeculiartostructuralsandwichconstructions.Thesimpleststructuralsandwichisathreelayeredconstructionformedbybondingathinlayer(facing)toeachsideofathicklayer(core).2.Terminologyco-curing,n—curingacompositelaminateandsimultaneouslybondingittothesandwichcore.co-fab,n—fabricationprocesswhereclose-outsandinsertsarebondedintothepanelthesametimethefacingsarebondedtothecore.core,n—acentrallylocatedlayerofasandwichconstruction,usuallylowdensity,whichseparatesandstabilizesthefacingsandtransmitsshearbetweenthefacingsandprovidesmostoftheshearrigidityoftheconstruction.doublers,n—anextrapieceoffacingattachedtostrengthorstiffenthepanelortodistributetheloadmorewidelytothecore.facingdelamination,n—wherethefacingbecomesdisbondedfromthecore.facedimpling,n—bucklingofthecompressivefacingintotheindividualcellsofthehoneycombcoreduetocompressiveloadingortheprepregfacingsaggingintotheindividualhoneycombcellsduringcocure.facewrinkling,n—bucklingofthecompressivefacingintoorawayfromthecore.Thisprogressesthewidthofthepanelandcausesfailure.facing,n—theoutermostlayerorcompositecomponentofasandwichconstruction,generallythinandofhighdensity,whichresistsmostoftheedgewiseloadsandflatwisebendingmoments:synonymouswithface,skinandfacesheet.inserts,n—apparatusplacedintothesandwichforattachingitems:synonymouswithhardpoints.shearcrimping,n—bucklingofthecompressivefacingduetolowcoreshearmodulus.Usuallycausesthecoretofailinshearatthecrimp.structuralsandwichconstruction,n—alaminarconstructioncomprisingacombinationoralternatingdissim...
