TENSILE FATIGUE BEHAVIOR OF A COATED 2-DIMENSIONAL CARBON-CARBON COMPOSITE LAMINATE

The room-temperature tensile static and fatigue properties of a coated two-dimensional carbon-carbon composite laminate are reported. The cr oss-ply laminate is made of 8HS balanced weave of T300 heat treated ca rbon fibers with a CVI densified inhibited carbon matrix. The fatigue properties are obtained for four different stress levels, The in-plane stiffness and strength degradation due to fatigue and fatigue hfe are obtained at these lour stress levels. The effect of the fatigue loadi ng on the matrix properties is determined by measuring the interlamina r tensile strength for two different fatigue stress revels. The coatin g interface tensile strength degradation due to the fatigue loading is also reported.