Abstract
The high temperature fracture behavior of a 2-D, discontinuous carbon-fiber/carbon-matrix composite has been studied through temperatures of 1650°C in argon. Both chevron- and straight-notch single-edge notch beam (SENB) bend specimens were tested in four orientations with respect to the fiber plane. In all cases, the crack growth resistance curve (R-curve) behavior and fracture toughness were characterized and correlated to the microstructure. The temperature effects on fiber pullout and extensive matrix damage lead to modifications in the following wake region, thereby influencing the resistance to crack growth. Modulus-of-rupture tests were also performed at 20°C to correlate the toughness dependence on orientation to crack initiation character.
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