Abstract
High temperature structural applications under aggressive environments demand a constant effort to develop new materials, like ceramics with reduced brittleness obtained by reinforcing ceramic fibers (CMCs). First, a general experimental interpretation and a microcomposite model with schematic representative blocks, are presented. Then an internal variable creep model suitable for CMCs and an additional modeling of the damage development during tertiary creep, are described and compared to experimental results.
Finally, fiber breaking takes over, leading to catastrophic rupture at high enough stresses. The modeling results presented provide the stress dependence of the minimum creep rate as well as the general appearance of tertiary creep, in good agreement with experiment.
Résumé
Les applications structurelles à haute température en environnement agressif, requièrent un effort constant de développement de nouveaux matériaux, tels des céramiques de fragilité réduite obtenue par des fibres de céramiques de renforcement (CMCs). Tout d’abord, une interprétation générale des expériences et un modèle micro-composite comportant une schématisation en blocs, sont présentés. Puis une modélisation du fluage avec variable interne applicable aux CMCs suivie d’une autre modélisation de l’endommagement présent dans la troisiéme phase du fluage, sont décrites et comparées aux résultats d’expériences. Finalement, la rupture des fibres entraîne la rupture catastrophique à un niveau de contraintes suffisamment élevé. Les modélisations présentées fournissent une relation entre la contrainte et la vitesse minimum de fluage aussi bien que l’allure de la troisième phase de fluage, en bon accord avec l’expérience.
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© 1998 Springer-Verlag Berlin Heidelberg
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Vallés, J.L., Steen, M., Lamouroux, F. (1998). Modeling Studies of the Uniaxial Creep of a Brittle Matrix Composite. In: Caliste, JP., Truyol, A., Westbrook, J.H. (eds) Thermodynamic Modeling and Materials Data Engineering. Data and Knowledge in a Changing World. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-72207-3_23
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DOI: https://doi.org/10.1007/978-3-642-72207-3_23
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