ISSN: 0884-6804
CODEN: JCTRER
Page Count: 7

Fatigue Crack Spacing in the Matrix of a Continuous Fiber SCS-6/Ti Composite
Hillberry, BM
Professor, Purdue University, IN

Johnson, WS
Senior scientist, NASA Langley Research Center, VA

Abstract

In this study the extensive matrix fatigue cracking that has been observed in notched SCS-6/Ti-15-3 composites is investigated. Away from the notch a uniform spacing of the fatigue cracks develop. Closer to the notch, fiber-matrix debonding occurs, increasing distance between the cracks. Crack spacing predicted from cylinder models compare favorably with experimental observations. SEM fractography showed that the principal fatigue crack initiation occurred around the 0° fibers. Primary fatigue cracking does not appear to be due to interface failure in the 90° plies.

Keywords:
composite, metal matrix, continuous fiber, fatigue, crack, spacing

Paper ID: CTR10372J
DOI: 10.1520/CTR10372J
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