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Implications of interface friction for crack growth in fibre-reinforced metal matrix composites by three-dimensional finite element modelling

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Abstract

A three-dimensional finite element model of a compact tension specimen consisting of a Ti-6Al-4V matrix reinforced with unidirectional, continuous SiC fibres under monotonic and cyclic loading has been developed. This has enabled true Coulomb frictional interface sliding resulting from thermal residual stresses to be modelled. The results, which include the action of individual bridging fibres close to the crack-tip, are compared to results from a two-dimensional weight function method which uses fibre-induced bridging tractions on the crack face based on a constant interface strength. Reasonable agreement was found between the two methods used. An investigation of the fibre stresses showed that together with normal crack bridging tractions a strong bending component is present in the fibres which also affects crack opening and could affect the mode of fibre failure. The influence of processing induced thermal residual stresses and friction at the fibre-matrix interface on the crack growth behaviour during monotonic and cyclic loading has been assessed. It was found that the bridging fibres strongly reduce the crack-tip stress intensity factor. The thermal residual stresses produce a crack-tip opening load in the absence of an external load and have an influence on the crack-tip load ratio. The effect of the crack-tip load ratio on the fatigue threshold has a significant impact on the likelihood of crack arrest.

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Authors and Affiliations

  1. Manchester Materials Science Centre, University of Manchester, Manchester, M1 7HS, UK

    G. Rauchs, P.F. Thomason & P.J. Withers

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  1. G. Rauchs
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  2. P.F. Thomason
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  3. P.J. Withers
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Rauchs, G., Thomason, P. & Withers, P. Implications of interface friction for crack growth in fibre-reinforced metal matrix composites by three-dimensional finite element modelling. International Journal of Fracture 125, 281–305 (2004). https://doi.org/10.1023/B:FRAC.0000022283.54186.65

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  • DOI: https://doi.org/10.1023/B:FRAC.0000022283.54186.65

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