ISSN: 0884-6804
Page Count: 9

Strength Reduction and Damage Characterization of SCS6/Ti-6Al-4V Composite Exposed to Fatigue at Elevated Temperature
Robertson, DD
Former assistant professor, professor, and former graduate student, Wright-Patterson AFB, OH

Lee, S-M
Former assistant professor, professor, and former graduate student, Wright-Patterson AFB, OH

Mall, S
Former assistant professor, professor, and former graduate student, Wright-Patterson AFB, OH

Abstract

Effect of fatigue loading on the residual strength of a unidirectional titanium matrix composite, SCS6/Ti-6-4, was investigated. The composite was fatigued isothermally at 427°C under load-controlled mode with an applied maximum stress of 900 MPa up to a certain fraction of the fatigue life, and then loaded monotonically to failure to obtain the residual strength. Two frequencies, 1 Hz and 0.01 Hz, were used to examine the time-dependent characteristics of the fatigue loading. Substantially different failure mechanisms and fatigue lives were observed, but the reduction in strength as a percentage of fatigue life was similar for the two cases. Practically no reduction in strength occurred until 75% of the expected fatigue life.

Keywords:
titanium matrix composites, metal matrix composites, fatigue, residual strength, fatigue life, tensile loading, damage mechanisms

Paper ID: CTR10052J
DOI: 10.1520/CTR10052J
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