Abstract
For several lay-ups of SCS-6/Ti-15-3 composites fatigue tests were conducted and analysed for both notched and unnotched specimens at room and elevated temperatures. Thermomechanical fatigue results were also analysed. Test results indicated that the stress in the 0° fibres is the controlling factor in fatigue life. The static and fatigue strengths of these materials are shown to be strongly dependent on the level of residual stresses and the fibre/matrix interfacial strength. Fatigue tests of notched specimens showed that cracks can initiate and grow many fibre spacings in the matrix material without breaking the fibres. Fibre bridging models were applied to characterize the crack growth behaviour. The matrix cracks are shown to reduce significantly the residual strength of notched composites. The notched strength of these composites was accurately predicted using a micromechanics-based methodology.
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