Designation:C1674−16StandardTestMethodforFlexuralStrengthofAdvancedCeramicswithEngineeredPorosity(HoneycombCellularChannels)atAmbientTemperatures1ThisstandardisissuedunderthefixeddesignationC1674;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thistestmethodcoversthedeterminationoftheflexuralstrength(modulusofruptureinbending)atambientconditionsofadvancedceramicstructureswith2-dimensionalhoneycombchannelarchitectures.1.2Thetestmethodisfocusedonengineeredceramiccomponentswithlongitudinalhollowchannels,commonlycalled“honeycomb”channels.(SeeFig.1.)Thecomponentsgenerallyhave30%ormoreporosityandthecross-sectionaldimensionsofthehoneycombchannelsareontheorderof1mmorgreater.Ceramicswiththesehoneycombstructuresareusedinawiderangeofapplications(catalyticconversionsupports(1),2hightemperaturefilters(2,3),combustionburnerplates(4),energyabsorptionanddamping(5),etc.).Thehoneycombceramicscanbemadeinarangeofceramiccompositions—alumina,cordierite,zirconia,spinel,mullite,siliconcarbide,siliconnitride,graphite,andcarbon.Thecomponentsareproducedinavarietyofgeometries(blocks,plates,cylinders,rods,rings).1.3Thetestmethoddescribestwotestspecimengeometriesfordeterminingtheflexuralstrength(modulusofrupture)foraporoushoneycombceramictestspecimen(seeFig.2):1.3.1TestMethodA—A4-pointor3-pointbendingtestwithuser-definedspecimengeometries,and1.3.2TestMethodB—A4-point-1⁄4pointbendingtestwithadefinedrectangularspecimengeometry(13mm×25mm×>116mm)anda90mmoutersupportspangeometrysuitableforcordieriteandsiliconcarbidehoneycombswithsmallcellsizes.1.4Thetestspecimensarestressedtofailureandthebreakingforcevalue,specimenandcelldimensions,andloadinggeometrydataareusedtocalculateanominalbeamstrength,awallfracturestrength,andahoneycombstructurestrength.1.5Testresultsareusedformater...
