Abstract
Effects of notch root radius on the crack initiation and growth toughnesses of a cross-ply [90°/0°] 2s Ti 6Al 4V/SiC f composite have been studied. The initiation toughness was found to be independent of the notch root radius, below a critical value of ϱ ≈ 50 μm. Beyond this value, the initiation toughness increases linearly with the notch root radius. In contrast, the crack growth toughness was found to be more or less independent of the initial notch root radius. The results are rationalized on the basis of the mechanism of fracture as well as the strain concentrations ahead of the notch.
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