Prediction of formability in sheet metal forming processes using a local damage model

• Type: Article in International Conference Proceedings Book
• Date: 2007

Authors

P. Teixeira (Author) Other; Abel Santos (Author) FEUP; J. César Sá (Author) Other; F. Andrade Pires (Author) Other; A. Barata da Rocha (Author) FEUP

Conference proceedings International

Title: NUMIFORM 07 - Materials Processing and Design: Modeling, Simulation and Applications

Pages: 153-158

NUMIFORM 07- The 9th International Conference on Numerical Methods in Industrial Forming Processes

Porto, Portugal, 17-21 June 2007

Indexing

ISI Web of Knowledge - 0 Citations

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INSPEC

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-004-E30

DOI: 10.1063/1.2740804

Abstract (EN): The formability in sheet metal forming processes is mainly conditioned by ductile fracture resulting from geometric instabilities due to necking and strain localization. The macroscopic collapse associated with ductile failure is a result of internal degradation described throughout metallographic observations by the nucleation, growth and coalescence of voids and micro-cracks. Damage influences and is influenced by plastic deformation and therefore these two dissipative phenomena should be coupled at the constitutive level. In this contribution, Lemaitre's ductile damage model is coupled with Hill's orthotropic plasticity criterion. The coupling between damaging and material behavior is accounted for within the framework of Continuum Damage Mechanics (CDM). The resulting constitutive equations are implemented in the Abaqus/Explicit code, for the prediction of fracture onset in sheet metal forming processes. The damage evolution law takes into account the important effect of micro-crack closure, which dramatically decreases the rate of damage growth under compressive paths.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6