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2 D-Carbon/Carbon Composite Materials with Quasi-Isotropic Characteristic in Plane

Sun Shoujin Liu Wenchuan Li Minjun (Institute of Metal Research,Academia Sinica,Shenyang)  
2 D-carcon/carbon composites,as as tack of carbon fabrics densified by chemicalvapor infiltration(CVI)technique,have strong anisotropic characteristic when car-bon fabrics are laid up in the same direction.Tensile and flexural strengthes of sa-moles along the direction of fiber bundles are by far larger than those of samplesalong the direction in an angle 45° with fiber bundles.The failure mechanism ofthe composites is different in two different directions,tensile and flaxural failuresof samples along the direction of fiber bundles result in fiber failure and delamina-tion respectivelly,while those of samples along the direction in an angle 45° withfiber bundles result in only nodes break of fiber bundles.It is able to increase theisotropic extent of composites by laying up carbon fibrics in different angles.with theangle of fiber bundles between two neighbouring carbon fabric decreasing,isotropicextent of composites increases,then tensile strengthes of composites decreasa slowlyand keep constant finally,however flexural strengthes of composites decrease a littleand then increase to the level of samples along the direction of fiber bundles,inwhich carbon fabrics are laid up the same direction.
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