简介：Basedonshearlagmodelofinterfacebetweenfiberandmatrix,anewformulathatre-latesthecrackopeningdisplacementandbridgingforceinfibrousmonolithicceramicswasconstructedundertheframeworkofsmallscalebridging.Thisformulawasappliedtopredictthefractureresis-tanceorR-curveresponseofathree-pointbendingspecimenmadeoffibrousmonolithicceramics.Aparametricinvestigationontheinfluencesoffibervolumefraction,fiberradius,characteristicsofconstituents,BN’sfracturetoughnessandspecimen’sgeometryonthebridgingforcesandfracturere-sistanceinSi3N4/BNcompositewascarriedout.TheupperandlowerlimitsoftheR-curveofSi3N4/BNinsmallscalebridgingwerederived,Thisresearchrevealedtheroleplayedbytheaboveparame-tersinthefracturetoughnessoffibrousmonolithicceramics.
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