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Nicolas DECULTOT
Abstract
Incremental forming of aluminium sheets: analysis of the process using full-field measurements and identification of behaviour models
Nicolas Decultot - 10 December 2009
This work deals with the study of the Single Point Incremental Forming process (SPIF). This new drawing process is mainly used in prototyping and small batch production. A sheet metal part is formed by a local spinning using a displacement-controlled small tool size in comparison with the sheet size. Firstly, a SPIF pilot instrumented with a multi-axial force sensor and with a multi-camera system allowing full-field optical measurements by 3D- Digital Image Correlation (3D-DIC) has been developed in the laboratory. Thanks to this SPIF device, a parametric study of the process was carried out on aluminium alloys sheets, mainly concerning the formability and drawability. Then, several identification methods are implemented to identify parameters of yield criteria (Hill48, Hill90 et Barlat) and isotropic hardening laws that modelise the elastoplastic anisotropic behaviour of the studied sheet. The Finite Element Method Updated, based on full-field measurements, was particularly developed. Finally, a finite element simulation of a simple path in incremental forming is carry out using the identified behaviour models, these results are compared with some experimental results.