Contribution of Strain Hardening Law Coupled to Damage and Remeshing Procedure in the Localization of Plastic Instabilities Application to Hydroforming Processes

• Published in: International journal of computational methods in engineering science and mechanics Vol. 12; no. 3; pp. 114 - 133
• Main Authors: Cherouat, Abel, Ayadi, Mahfoudh, Rezgui, Mohamed Ali
• Format: Journal Article
• Language: English
• Published: Taylor & Francis Group 29-04-2011; Taylor & Francis
• Subjects: Constitutive relationships; Engineering Sciences; experimental tests; FEM; Hydroforming; Internal pressure; Irreversible processes; Mechanics; Methodology; plastic instability; remeshing; Strain hardening; Stress-strain relationships; Three dimensional; hydroforming; experimental tests; remeshing; plastic instability; FEM
• ISSN: 1550-2287; 1550-2295
• DOI: 10.1080/15502287.2011.564268

In this study, we present an experimental/numerical methodology, which aims to improve 3D thin sheet hydroforming considering coupled constitutive equations formulated in the framework of the thermodynamics of irreversible processes accounting for isotropic hardening as well as isotropic ductile damage. The experimental study is dedicated to the identification of stress-strain flow from the global measure of pole displacement, thickness evolution, and internal pressure expansion. During the hydroforming processes severe mesh distortion of element occurs and an automatic remeshing generation is essential to carry out the FEA. Some examples are given to demonstrate the efficiency of the proposed methodology.