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Brittle Matrix Composites 3 by P. Stroeven (auth.), A. M. Brandt, I. H. Marshall (eds.)

By P. Stroeven (auth.), A. M. Brandt, I. H. Marshall (eds.)

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Mech. E30, 232-236, 1963. 3. Rice J. R. and Sih G. , Plane problem of cracks in dissimilar media. J. Appl. Mech. E32, 418-423, 1965. 4. Farris T. , Williams' blister test analyzed as an interface crack problem. of Fract. 27, 91-103, 1985 5. Deukman A. , Weight function theory for a rectilinear anisotropic body. Int. J. of Fract. 34, 85-109, 1987. 6. Szmelter J. The Finite Element Programs. Arkady, Warsaw, 1973. 7. Zienkiewicz O. C. The Finite Element Method Science. Mc Graw - Hill, London, 1971.

Results are presented by means of the logarithmic rate cartography (CTL: cartographie des taux logarithmiques). The use of logarithmic rates Henrat [7], Henrat et al. [8], Surrel and Vautrin [9] have shown the relevancy of using a logarithmic representation of the cumulative number of events. Basically, the measurements provided by an AE equiment may be represented as a two dimensional surface of equation: z = n(c,t) (1) where n stands for the cumulative number of events in the channel number c at time t.

50 Fig . 6. Stresses and isochromatic fringes (($~- ($2) at cracking. a) vertical cracking, b) horizontal crack propagation. No EL. NUMERICAL RESULTS VERT! CAL CRACK No EL. 15 -1. 205 - 36 . 363 -0 . 424 26 For comparison, the numerical and experimental fringes distributions are presented in Fig. 6 . isochromatic 3. FAILURE AND CRACKING MECHANISMS The critical load causes the propagation of cracks , which have developed directly, perpendicular to the beam axis, but further, as the load was being increased they turned and ran parallel to the beam axis.

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