Abstract
The thermo-mechanical fatigue behavior of a cross-ply laminate of a silicon-carbide-fiber-reinforced titanium-matrix composite, SCS-6/Ti-15-3, has been investigated. Two sets of tests involving in-phase and out-of-phase thermal-mechanical fatigue from 149 to 427°C at different stress levels, which were below and above the static first ply failure strength of the laminate, were conducted. Fatigue damage originated at the fiber/matrix interface of 90° fibers, and progressed as transverse cracking in the matrix. However, final damage modes were dependent on stress level and test conditions. Furthermore, fatigue lives were also found to be dependent on test conditions at a given stress level.
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