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.
Abstract. Single Point Incremental Forming (SPIF) is a promising sheet metal forming process for prototyping and small batches, in which the blank is formed in a stepwise fashion by a displacement-controlled small-sized tool. Due to specific strain paths induced by the process and limited plastic zones in the contact region between the tool and the workpiece, forming diagrams and forming strategies are different from the classical stamping processes. One major limitation of SPIF is the lack of accuracy of the obtained final parts because of the poor knowledge of the state of stress during the process that requires a good description of the material models and a right choice of the process parameters. In this paper, the SPIF process is experimentally investigated by the mean of surface 3D digital image correlation during the forming of a AW-5086-H111 grade aluminium alloy. Development of strain fields encountered in incremental forming is reported and material formability is evaluated on several formed shapes, taking into account a wide range of straining conditions of this process.
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