ISSN: 0884-6804
Page Count: 9

Differences in Fatigue and Fracture Behavior of Woven-Mat and Acrylic Binder SCS-6/Ti-15-3 Composites
Buchanan, DL
Lead engineer, senior engineer, and technical specialist, McDonnell Douglas Aerospace, MO

Harmon, DM
Lead engineer, senior engineer, and technical specialist, McDonnell Douglas Aerospace, MO

Harter, JA
Research engineer, Wright Laboratories, Wright-Patterson Air Force Base, OH

Finefield, MA
Lead engineer, senior engineer, and technical specialist, McDonnell Douglas Aerospace, MO

Abstract

This paper summarizes testing performed on SCS-6/Ti-15-3 composites that were fabricated using two different methods of fiber alignment. One composite used an acrylic binder to hold the fibers straight and parallel to each other while the second method used a Ti-6-4 ribbon weave which produced a SCS-6 woven fiber mat. Fatigue test results indicated that the woven mat composite was more likely to develop Mode I cracks which would propagate through the specimen failing fibers. This led to catastrophic failures. Conversely, the acrylic binder composite was subject to multiple matrix cracking in which fibers did not fail, but bridged the cracks and resulted in longer fatigue lives.

Keywords:
titanium matrix composites (TMCs) SCS-6 fiber, strength, fatigue, crack initiation, crack growth, damage, failure modes

Paper ID: CTR10374J
DOI: 10.1520/CTR10374J
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