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| Motta, Antonella |
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| Azevedo, Nuno Monteiro |
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Teixeira, P.
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Publications (6/6 displayed)
- 2019Comfort and Infection Control of Chitosan-impregnated Cotton Gauze as Wound Dressingcitations
- 2016Integrated thermomechanical model for forming of glass containerscitations
- 2013An investigation of the potential application of chitosan/aloe-based membranes for regenerative medicinecitations
- 2012Damage Prediction in Incremental Forming by Using Lemaitre Damage Modelcitations
- 2008Failure Analysis of Metallic Materials in Sheet Metal Forming using Finite Element Method
- 2007Prediction of formability in sheet metal forming processes using a local damage model
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document
Prediction of formability in sheet metal forming processes using a local damage model
Abstract
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.