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An inverse identification method of material parameters for nonlinear behaviour. (Une méthode d’identification inverse des paramètres matériels pour les comportements non-linéaires.) (French) Zbl 0924.73072

Summary: The characterization of rheological behaviour of materials in nonlinear range is based on experimental tests, characterized by non-homogeneous stress and strain states, making the direct identification very difficult to perform. In this paper, an inverse identification method is proposed to avoid the problems raised by the interpretation of the experimental tests and to determine more accurately material parameters. The algorithm developed consists of an optimization method and a finite element method. This algorithm is first tested by the determination of material parameters in the case of the nonlinear elastic behaviour of polymers, then applied to the inverse identification of viscoplastic parameters of an aluminium alloy.

MSC:

74C99 Plastic materials, materials of stress-rate and internal-variable type
74S05 Finite element methods applied to problems in solid mechanics
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