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Experimental characterization and numerical modeling of micromechanical damage under different stress states

Article dans une revue avec comité de lecture
Author
ACHOURI, Mohamed
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
ccGERMAIN, Guénaël
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
DAL SANTO, Philippe
211916 Laboratoire Angevin de Mécanique, Procédés et InnovAtion [LAMPA]
SAIDANE, Delphine
419132 DEVILLE ASC

URI
http://hdl.handle.net/10985/8398
DOI
10.1016/j.matdes.2013.02.075
Date
2013
Journal
Materials and Design

Abstract

The use of HSLA steels for the manufacture of automotive components is interesting from an engineering point of view. This family of steels, while possessing high strength, also has good formability and can be used in forming manufacturing processes. In some forming processes such as blanking, shear strain localization occurs, which causes damage and results in the final fracture of the material. This paper presents an experimental study based on in situ tests to understand and identify the physical mechanisms of ductile damage under two stress states: tension and shear. Different macroscopic tests were performed to calibrate a damage model based on a micromechanical approach. This damage model is based on the Gurson–Tvergaard–Needleman theory and presents recent improvements proposed by Nahshon and Hutchinson and by Nielsen and Tvergaard so as to better predict fracture under a wide range of stress states, especially with low levels of stress triaxiality. These extensions have made the identification of the material parameter more complicated. In this work an identification strategy has been proposed using tests on specimens with different shapes. The identified parameter values are validated and the fracture model show good predictive capability over a wide stress state range.

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