Designation:D8388/D8388M−22StandardPracticeforFlexuralResidualStrengthTestingofDamagedSandwichConstructions1ThisstandardisissuedunderthefixeddesignationD8388/D8388M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeprovidesinstructionsformodifyingthelongbeamflexuretestmethodtodeterminethetensileorcompressiveresidualstrengthpropertiesofsandwichconstruc-tionsthathavebeensubjectedtoquasi-staticindentationordrop-weightimpactperPracticeD7766/D7766M.Thetensileorcompressivestrengthresultisdeterminedbywhichfacesheetcontainsthedamage,eithertheloaded-spanorsupport-spanfacesheet,basedonhowthespecimenisposi-tionedinthefixture.1.2ThispracticesupplementsTestMethodD7249/D7249Mwithprovisionsfortestingdamagedsandwichspecimens.Severalimportanttestspecimenparameters(forexample,facesheetthickness,corethicknessandcoredensity)arenotmandatedbythispractice;however,repeatableresultsrequirethattheseparametersbespecifiedandreported.1.3Units—ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequiva-lents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.3.1Withinthetext,theinch-poundunitsareshowninbrackets.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizatio...
