Abstract
Crack propagation in sintered SiC fiber reinforced alumina matrix composites was studied in situ inside a scanning electron microscope. Both crack front and crack wake toughening mechanisms were studied in isolation. In the crack front study, the crack propagation behavior varied with fiber coatings. For the uncoated fibers, a three-fold load increase was necessary to advance the crack over the fibers. A gradual load increase was necessary to propagate the crack over the fibers that were initially polymer coated. In samples where the fibers were either metal or polymer/metal coated, the crack becomes unstable before reaching the fiber positions and the fibers had no effect in resisting the crack propagation. However, the metal coated samples reached the highest toughness values during the crack wake study, with an increase in toughness of 75% over the monolithic samples. Crack profiles were measured and the crack opening displacements revealed direct evidence of the crack fiber interactions.
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