Fracture of Al-Sicw Metal Matrix Composites
Reinforcement of silicon carbide whiskers improved significantly the elastic and strength behaviours of aluminium alloys. Unfortunately, the increase of the volume fraction of whiskers is responsible for a very low ductility of these M.M.C. and the sensitivity to stress concentration is very high. In order to use these materials in some structural components, we need to obtain a fracture criterion for the 2124 Al + 20% SiCw at room and high temperatures (i.e.20°C to 350°C). After a tension and fatigue crack growth characterization, a damage micromechanics modelisation based on the microstructural characteristics such as the aspect ratio and the volume fraction distributions is established.
KeywordsResidual Stress Fiber Axis Damage Criterion Fiber Aspect Ratio Volume Fraction Distribution
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- 1.Flom, Y., Arsenault, R. J., “Fracture of SiC/Al composites”, (1987), Proc. ICCM VI & ECCM 2, London.Google Scholar
- 2.Nutt, S. R., “Interfaces and failure mechanisms in Al-SiC composites” in Interfaces in metal matrix composites, (Dhingra and Fishman ed), (1986).Google Scholar
- 3.J.C. Le Flour, “Elaboration d’alliages d’Aluminium et de composites base Aluminium par métallurgie des poudres”, PhD Thesis E.N.S.M.P., (1987).Google Scholar
- 4.P.J. Whiters, D. Juul Jensen, H. Lilholt and W.M. Stobbs, “The evaluation of internal stresses in a short fibre metal matrix composite by neutron diffraction”, (1987), Proc. ICCM VI & ECCM 2, London.Google Scholar
- 5.R.A. Hunt and L.N. Mc Cartney, “A new approach to Weibull’s statistical theory of brittle fracture”, (1979), Int. J. of Fracture, Vol. 15, No 4Google Scholar