By C. F. Shih (auth.), S. H. Teoh, K. H. Lee (eds.)

Recent advances within the box of fracture of engineering fabrics and constructions have more and more indicated its multidisciplinary nature. This quarter of study now contains scientists and engineers who paintings in fabrics technological know-how, utilized arithmetic and mechanics, and likewise machine scientists. the current quantity, which incorporates the court cases of the Joint FEFG/lCF overseas convention on Fracture of Engineering fabrics and constructions held in Singapore from the sixth to eighth of August 1991, is an affidavit of this multidisciplinary nature. This foreign convention was once the second one Symposium of the some distance East Fracture staff (FEFG) and therefore supplied a different chance for researchers and engineers within the a long way East zone to replace and obtain wisdom of latest advances and functions in fracture. The convention used to be additionally the Inter-Quadrennial foreign convention on Fracture (ICF) for 1991 and hence appealed to researchers within the foreign enviornment who wanted to use this assembly to offer their findings. The convention has introduced jointly over one hundred thirty individuals from greater than 24 nations, and so they represented executive and commercial learn laboratories in addition to educational associations. It has therefore completed its goal of bringing jointly scientists and engineers with diversified backgrounds and views yet with . a typical curiosity in new advancements within the fracture of engineering fabrics and constructions. This quantity includes four keynote papers, four invited papers and a hundred thirty contributed papers.

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Riihle, A. G. Evans, D. B. MarshallandJ. J. Brennan,!. Am. Ceram. , 73 (1990) 1691. (29) W. Curtin, Appl. Phys. , (30) J. W. Hutchinson and Z. Suo, Advances in Applied Mechanics, 28 (1991) in press. (31) W. S. Johnson, S. J. Lubowinski, A. L. Highsmith, W. D. Brewer and C. A. Hoogstraten,NASA Technical Reporl, NASP TM-1014 (April 1988). (32) A. L. Highsmith, S. J. Lubowinski and W. S. Johnson, ASTM STP 1080 (Eds. Kennedy, Moelles and Johnson) 1990, in press. (33) D. Walls, G. Bao and F. W. Zok, Scripta Metali.

In a region of high stress concentration, such as at the tip of an advancing crack, fibres often fail and fracture. As the crack front continues to advance, these fibres are pulled out of the surrounding matrix. In overcoming the resultant frictional force, work is done and energy is dissipated. If one assumes that the maximum fibre pull-out length is equivalent to one half of the critical fibre length, Ie, then the work to pull-out a fibre is given as [13] Surface treating the fibres and therefore increasing the strength of the fibre-matrix interface reduces the critical transfer length resulting in a reduction in the energy dissipated in fibre pull-out [15].

The effect of matrix cracking on the mechanical properties of fibre reinforced composites has received very little attention. A detailed analysis by Kriz [20] showed clearly that matrix cracks in 90° plies of a moisture-saturated [0°,90°,+/_45°] carbon fibre/epoxy composite precipitated failure in adjacent 0° plies. It was also shown that the failure locus of the 0° plies could be related directly to the position of matrix cracks in the 90° plies. Matrix Deformation. Plastic deformation in the matrix of a polymer-based composite is rarely discussed when considering failure processes in advanced composites.

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