One damage law for different mechanisms |
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Authors: | J Lemaitre J P Sermage |
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Affiliation: | (1) Laboratoire de Mécanique et Technologie ENS Cachan, C.N.R.S., Université Paris 6, 61 avenue du président Wilson F-94235 Cachan, France, FR |
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Abstract: | We consider here a general three-dimensional kinetic damage law. It uses the thermodynamic of irreversible processes formalism
and the phenomenological aspects of isotropic damage. It gives the damage rate as a function of its associated variable, the
strain energy density release rate and the accumulated plastic strain rate.
Associated with different plastic constitutive equations, this damage law takes into account brittle damage, ductile damage,
low and high cycle fatigue and creep damage. In this paper we mainly focus on creep-fatigue interaction and high cycle fatigue.
Associated to a viscoplastic constitutive equation having kinematic hardening, the damage law gives the non linear creep-fatigue
interaction. The agreement with experiments is good. Associated to plastic constitutive equations also having kinematic hardening
but introduced in a micromechanical two scale model based on the self-consistent scheme, it models the non linear accumulation
of damage induced by a succession of sequences of different amplitudes as well as the effect of the mean stress and the influence
of non proportional loading. |
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