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1、406JournalofTheAmericanCeramicSociety-Heueretal.Vol.61,NO.9-10thefirststagesofregionI1thefracturefrontbowsbackwardtoallowmoretimefortheenvironmentalagenttodiffusetothemiddleofthefracturefront.Anunevendistributionofstressresults,increasingKlocalatthecen
2、ter.Back-bowingcontinuestosharpenasK,,,increasescrackvelocityuntilsomecombinationoftotalcrack-frontstressandunevendistributionofstressacrossthefrontbythenegativecrack-frontcurvatureincreasesstressatthemidplanesuf-ficientlyfortheregion111processalonetos
3、ustainfractureatthemidplane.Thisintrinsicfractureprocessspreadswithincreasingcrack-frontstressandvelocityuntilitconstitutestheentirefront.Atthispointunevenstressdistributionbynegativecrack-frontcurva-turebecomesunnecessaryforsustainingtheintrinsicfract
4、urepro-cess.Crack-frontcurvaturechangessmoothlyfromnegativetopositiveandvelocityincreasestowarditsterminalvalue.Acknowledgment:Thewritersthanks.W.Freiman,R.M.Klein,andA.G.Kolbeckforhelpfulsuggestionsandforreviewingthemanuscript.ReferencesFig.8.Fracture
5、surfacewithdifferentmoisturecondensationpatternin-S.M.Wiederhom,“InfluenceofWaterVaporonCrackPropagationinSoda-sideandoutsidewedge.Samplefracturedindecane;fracturedirectionlefttoLimeGlass,”J.Am.Cerum.Soc.,50[8]407-14(1967).right.K.Schoenert,H.Umhauer,a
6、ndW.Klemm;pp.474-82inFracture-1969.EditedbyP.L.Pratt.Chapman&Hall,London,1969.S.W.Freiman,“EffectofAlcoholsonCrackPropagationinGlaCerum.So<.,57[8]350-53(1974).S.W.Freiman,“EffectofStraight-ChainAlkanesonCrackPropagationinGlass,”ihid..58[7-81339-40(1975
7、).TheprecedingdiscussionhasbeennonspecificwithrespecttotheJ.R.VamerandV.D.Frechette;pp.507-12inAmorphousMaterials.EditedbyD.W.DouglasandBryanEllis.Wiley-Interscience,NewYork,1972.specieswhichactuallycontrolsregionI.Thesampleswerefrac-‘C.L.Quackenbushan
8、dV.D.Frechette,“SlowFractureofGlassinLiquidturedinalkanesbuttheirbehaviormaybecharacteristicoffractureAlkanes”;forabstractseeAm.Cerum.Soc.Bull.,52[4]389(1973).S.M.Wiederhorn;pp.613-46inFractureMechanicsofCeramics,Vol.2.controlledbyanact
