Abstract:Thecarbon/carboncompositesringpreparedbychemicalvaporinfiltration(CVI)withneedled
feltaspreformisanisotropy.Theircompressivepropertiesandfracturemechanismofthreeprincipaldirectionswerestudied.
Theresultsshowthattheaxialcompressivepropertiesaresimilartothehoopcompressivepropertieswithhighercompressivemodulus.
Theneedledfeltcarbon/carboncompositesexhibitquasiductilefracturebehaviorunderradialcompression.
Manysmallfragmentsoffibersandmatrixcarbononthe
fracturesurfaceoftheradialcompressivespecimensareobservedandthefailuremodesareshearwithmatrix
crushed.Underaxialandcircinalloading,thecompositesexhibitcatastrophicfailurebehaviorandthespecimensaredestroyedbydelaminationandsplitting.
