Abstract
The fatigue response of a cross-ply [0/90]2S titanium (Ti-15-3) matrix composite reinforced with silicon carbide fibers (SCS-6) was investigated at 427%C. Tension-tension (tensile mean stress) and tension-compression (zero mean stress) loadings were applied. For the same stress range, tension-tension loading caused much lower fatigue lives greater strain ratchetting than those under tension-compression loading. Despite the longer fatigue lives under tension-compression loading, additional plasticity sites and fatigue damage mechanisms were observed. Fatigue damage mechanisms could be classified into two distinct regimes, independent of mean load, fiber-dominated (fibers fracture prior to matrix cracking) at high-stresses and low-cyclic lives, and matrix dominated (matrix fatigue cracks prior to fiber fracture) at longer lives. Comparisons of the 427%C results are made with previously reported results at room temperature. Deformation mechanisms and fatigue lives were influenced by the testing temperature.
Keywords:
damage mechanisms, fatigue, tension-compression, tension-tension, titanium matrix composites
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Author Mall S, Boyum EA
Title Fatigue Behavior of a Cross-Ply Titanium Matrix Composite with Tensile and Zero Mean Load at Elevated Temperature
Symposium ,
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