Direct observation of the fracture of CAS-glass/SiC composites
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The fracture behaviour of a CAS-glass/SiC-fibre-reinforced composite was observed by dynamic in situ scanning electron microscopy (SEM). In a companion paper , tests on common delamination geometries are described and the basis of micromechanics models is critically evaluated. Flexure geometries and also the unnotched tensile response of ceramicmatrix composites (CMCs) have received considerable attention, both theoretically and experimentally. The effect of through-thickness notches on the tensile fracture of CMCs has however been relatively neglected. Previous work on polymer-matrix composites demonstrates the strong influence of subcritical damage on the fracture behaviour. In this paper we examine failure of notched CAS-glass/SiC composites in tension, under static- and fatigue-loading conditions, using a combination of in situ and conventional test methods. The subcritical damage which forms is compared with that in polymer-matrix composites, and the consequences for prediction of the notched strength are discussed.
KeywordsPolymer Microscopy Electron Microscopy Scanning Electron Microscopy Strong Influence
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