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On a fully three-dimensional finite-strain viscoelastic damage model: Formulation and computational aspects. (English) Zbl 0588.73082
A fully three-dimensional finite-strain viscoelastic model is developed, characterized by: (i) general anisotropic response, (ii) uncoupled bulk and deviatoric response over any range of deformations, (iii) general relaxation functions, and (iv) recovery of finite elasticity for very fast or very slow processes; in particular, classical models of rubber elasticity (e.g. Mooney-Rivlin). Continuum damage mechanics is employed to develop a simple isotropic damage mechanism, which incorporates softening behavior under deformation, and leads to progressive degradation of the storage in a cyclic test with increasing amplitude (Mullins’ effect). A numerical integration procedure is proposed which trivially satisfies objectivity and bypasses the use of midpoint configurations. The resulting algorithm can be exactly linearized in closed form, and leads to symmetric tangent moduli. Quasi-incompressible response is accounted for within the context of a three-field variational formulation of the Hu-Washizu type.

MSC:
74D10 Nonlinear constitutive equations for materials with memory
74S30 Other numerical methods in solid mechanics (MSC2010)
74D05 Linear constitutive equations for materials with memory
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