Numerical investigation of ductile damage parameters identification: benefit of local measurements

Emile Roux (1) , Pierre-Olivier Bouchard (1)

1 CEMEF - Centre de Mise en Forme des Matériaux

Identification of material parameters is an important issue to improve the accuracy of finite element computations. Identification of these parameters by inverse analysis is based on experimental observables coming from mechanical experiments. In this paper, a simple tensile test is used. Two types of observables are investigated to identify ductile damage law parameters. The first one is a global measurement, such as the load-displacement curve. The second is a local observable based on full field measurements. Our approach, based on response surfaces, allows an efficient analysis of identification issues. Ill conditioned problems and multi-minima can be obtained using only a global observable. Full field measurements are a good way to improve the identification of plastic hardening and damage law parameters. In fact, local measurements combined with global ones, lead to a better formulation of the inverse problem.

Mots clés: Parameters identification; inverse analysis; global optimization; sensitivity analysis; ductile damage; full field measurements

Domaines: Matériaux

Emile Roux, Pierre-Olivier Bouchard. Numerical investigation of ductile damage parameters identification: benefit of local measurements. The 7th International Conference on Inverse Problems in Engineering (ICIPE), May 2011, Orlando, United States. p. 221-226 - ISBN 978-0615471006. ⟨hal-00676849⟩