Identification of hardening parameters using finite element models and full-field measurements: some case studies

摘要

This paper is focused on the identification of elasto-plastic behaviour parameters of aluminium alloy 2024-T3 using full-field measurements. An orthotropic Hill criterion including an isotropic hardening is considered. Standard tensile tests provide a first set of parameters. Some of these parameters are optimised thanks to an inverse modelling including finite element analysis and experimental full-field displacement measurements. This so-called finite element model updated process is based on different specimen geometries which induced heterogeneous strain fields. Full-field measurements are provided by digital image correlation technique. The aim of this work is to study the impact of the specimen shape that gives the heterogeneous strain fields on the identification of isotropic hardening parameters. Results are compared and discussed.