Une methode d'identification inverse des parametres materiels pour les comportements non-lineaires
Keywords:
nonlinear behaviour, material parameters, inverse identification, optimization, finite elementsAbstract
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.
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