The micromechanics of fatigue crack growth at 25 °C in Ti-6Al-4V reinforced with SCS-6 fibers |
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Authors: | D L Davidson |
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Affiliation: | (1) Southwest Research Institute, 78228-0510 San Antonio, TX |
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Abstract: | Micromechanics parameters for fatigue cracks growing perpendicular to fibers were measured for the center-notched specimen
geometry. Fiber displacements, measured through small port holes in the matrix made by electropolishing, were used to determine
fiber stresses, which ranged from 1.1 to 4 GPa. Crack opening displacements at maximum load and residual crack opening displacements
at minimum load were measured. Matrix was removed along the crack flanks after completion of the tests to reveal the extent
and nature of the fiber damage. Analyses were made of these parameters, and it was found possible to link the extent of fiber
debonding to residual COD and the shear stress for fiber sliding to COD. Measured experimental parameters were used to compute
crack growth rates using a well-known fracture mechanics model for fiber bridging tailored to these experiments. |
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