A time-dependent damage model is developed for quasi-brittle materials like rock or concrete, in the framework of Continuum Damage Mechanics. Phenomena like relaxation, creep and rate-dependent loading are covered using a unified framework. Creep failure under high-sustained load is explained quite simply within stability theory. Kachanov's equation is commented within the new approach. Creep failure appears as the manifestation of a bifurcation phenomenon.
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