Characterization of Fracture in (0/90)3s SiC/1723 Composites
Interim rept. 27 Aug 1987-17 Sep 1991
DAYTON UNIV OH RESEARCH INST
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The fracture behavior of 0 DEG90 DEG sub 3s cross-plied ceramic-matrix composites is evaluated using compact tension specimens. The influence of notch preparation abrasive water-jet or diamond saw cut and fatigue precracking is investigated. The extent that a calculated critical stress intensity factor can be used as a fracture toughness parameter is investigated. The stress-intensity factor corresponding to the maximum load. K sub peak is found to yield consistent values for the precracked specimens. However, this parameter is found to be higher for precracked specimens than for notched specimens. This difference in K sub peak is attributed to fiber bridging of the crack in the precracked specimens. No difference in material behavior is observed between specimens with abrasive water-jet and diamond saw notch extensions. There seems to be no noticeable size effects on K sub peak for precracked specimens, in contrast with the uncracked specimens. Ceramic Matrix Composite, Fracture Toughness, Fatigue Precracking, Compact Tension, Linear Elastic Fracture Mechanics, Compliance, Crack.
- Laminates and Composite Materials