Designation:C674−13StandardTestMethodsforFlexuralPropertiesofCeramicWhitewareMaterials1ThisstandardisissuedunderthefixeddesignationC674;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thesetestmethodscoverdeterminationofthemodulusofruptureandthemodulusofelasticityoffiredceramicwhitewaresbodies,formedbyanyfabricationmethod,andareapplicabletobothglazedandunglazedtestspecimens.1.2Thevaluesstatedininch-poundunitsaretoberegardedasthestandard.Themetricequivalentsofinch-poundunitsmaybeapproximate.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.SummaryofTestMethods2.1Thespecimens,eithercylindrical,orrectangular,aresupportedonknifeedgesoverasuitablespanandadirectloadisappliedatthemidpointbetweenthesupportsatauniformrateuntilbreakageoccurs.Themodulusofelasticitymaybedeterminedbyhaltingtheappliedloadatdefiniteintervalsandmeasuringthedeflectionofthespecimenatthemidpointtothenearest0.001in.(0.025mm).3.SignificanceandUse3.1Thesetestmethodsprovideameansfordeterminingthemodulusofruptureandthemodulusofelasticity,whichmayberequiredinproductspecifications.4.Apparatus4.1TestingMachine—Anysuitabletestingmachinemaybeused,provideduniformratesofdirectloadingcanbemain-tained.4.1.1Forallspecimenstheloadingrateshouldbesuchthatthespecimenshouldfailinapproximately1min.Table1listsloadingratesthatshallbeusedforeachsizespecimen.Forstrengthsofspecimensintermediateofthosespecified,inter-polationcanbeusedtoobtaintheequivalentloadingrate.4.1.2Fortheprescribedrectangularspecimenstheloadingrateshallbe10006150lbs(454668kg)/min.4.2BearingEdges—Forthesupportofthetestspecimen,twosteel(orhigh-st...
