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1、TheoryofThermalShockResistanceofBrittleMaterialsBasedonWeibull‘sStatisticalTheoryofStrengthbyS.S.MANSONandR.W.SMITHLewisFlightPropulsionLaboratory,NationolAdvisoryCommitteeforAeronautics,Cleveland,OhioPresenttheoriespredictingtheresistanceofstress,asisthecas
2、eforabendingspecimen.Topredictthebrittlematerialstothermalshockarebasedonstrengthofagivenbodyinaprescribedtypeofloading,athepremisethatfailureoccursontheattain-testspecimenshouldthereforebechoseninwhichthestressmentofadefinitecriticalstress.’However,thedistr
3、ibutionissimulatedascloselyaspossible.Inathermalfailureofmanybrittlematerialshasbeenshownshockspecimenthestressdistributiondepends,however,ontobedependentuponstressdistributionwithintheseverityofthequenching.Inamildquenchingthethebodyratherthanuponthemaximum
4、stressstressbuildsupgradually,andaconsiderablevolumeofma-criteria.Weibull’sstatisticaltheoryofstrengthterialisunderappreciablestresswhenthesurfacereachesthewhichaccountsforthisbehaviorisadaptedtomaximumstresc;.Inaseverequenching,surfacestressrisespredictthes
5、trengthofthecirculardisksofrapidlytoamaximumbeforetheremainderofthevolumede-brittlematerialssubjectedtoperipheralthermaltectsappreciablestressrise.Hence,althoughthesurfaceshock.Thisanalysisshows,forthosematerialsstressesmaybethesameinamildandinaseverequenchi
6、ng,inwhichtensilestrengthdiffersappreciablyfromtheprobabilityoffractureforthetwocasesmaydifferbe-thebendingstrength,thatconsiderableerrorcauseofthedifferentstressdistribution.Formaterialsthatcanbeintroducedbytheuseoftheconventionalareverysensitivetostressdis
7、tribution,therefore,asinglemaximumstresstheoryoffracturewhenpredict-determinationofstrengthmaynotdirectlyservethecorrela-ingthermalshockresistanceoverawiderangetionofthermalshockdataundervaryingdegreesofquenchingofquenchingseverities.Experimentalthermalsever
8、itybyuseoftheuy/Eaparameter.shockdataforsteatiteareanalyzedtoshowpro-Theobjectofthisreportistopresentatheoryofthermalceduresforapplyingthetheory.shockresistancewhichconsiderstheprobabilityoffrac
