Abstract
AbstractA micromechanical model that has been used to describe the elastic and fracture behavior of low density fibrous ceramics is reviewed and extended to incorporate the time-dependent failure process that can occur in these materials. In particular, it is shown that the stress exponent that describes the time-dependence of the subcritical crack growth process is expected to be that of the parent material from which the fibers are made. Experimentally, it is shown that the time-dependence of the two classes of silica fiber tiles used in the thermal protection systems of the current Space Shuttles is similar to that of the parent silica glass. The paper also reviews the use of fracture mechanics in characterizing subcritical crack growth in such materials and its application to the structural design of reliable systems. Resume Un modele micro-mecanique utilise pour decrire le comportement elastique et la rupture de ceramiques fibreuses a faible densite est revise et complemente pour y introduire l'infiu...
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