SPALLATION AND SHOCK-WAVE BEHAVIOUR OF SOME CERAMICS

J. Cagnoux , F. Longy

To determine the best use of ceramics in shock-wave technology it is necessary not only to know certain dynamic characteristics like the Hugoniot elastic limit and the spall strength, but also the micromechanisms associated with their deformation and failure. This paper is a discussion of these different aspects for three types of ceramics : silica glasses, glassceramics and sintered alumina. For glasses, the influence of silica's permanent densification on the material's rigidity and on its spall strength is discussed. For glass-ceramics, we show the existence of a microcraking of the material for a stress lower than their Hugoniot elastic limit. For alumina, we discuss the respective rôle of grain microplasticity and of microcracking of the intergranular glassy phase on the formation of two-wave structure.

Domaines: Articles anciens

J. Cagnoux, F. Longy. SPALLATION AND SHOCK-WAVE BEHAVIOUR OF SOME CERAMICS. Journal de Physique Colloques, 1988, 49 (C3), pp.C3-3-C3-10. ⟨10.1051/jphyscol:1988301⟩. ⟨jpa-00227717⟩