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Title: 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.

Authors:
 [1]; ; ;  [2];  [2];  [3]
  1. INEGI, Inst. of Mech. Engineering. and Indust. Management, R. Barroco 174, 4465-591 Leca do Balio (Portugal)
  2. FEUP, Faculty of Engineering, University of Porto, R. Dr. Roberta Frias, 4200-465 Porto (Portugal)
  3. (Portugal)
Publication Date:
OSTI Identifier:
21057378
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 908; Journal Issue: 1; Conference: NUMIFORM '07: 9. international conference on numerical methods in industrial forming processes, Porto (Portugal), 17-21 Jun 2007; Other Information: DOI: 10.1063/1.2740804; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; A CODES; ALLOYS; COALESCENCE; COMPUTERIZED SIMULATION; CRACK PROPAGATION; CRACKS; DAMAGE; DUCTILITY; FRACTURES; METALS; NUCLEATION; PLASTICITY; SHEETS; STRAINS; VOIDS

Citation Formats

Teixeira, P., Santos, Abel, Cesar Sa, J., Andrade Pires, F., Barata da Rocha, A., and INEGI, Inst. of Mech. Engineering. and Indust. Management, R. Barroco 174, 4465-591 Leca do Balio. Prediction Of Formability In Sheet Metal Forming Processes Using A Local Damage Model. United States: N. p., 2007. Web. doi:10.1063/1.2740804.
Teixeira, P., Santos, Abel, Cesar Sa, J., Andrade Pires, F., Barata da Rocha, A., & INEGI, Inst. of Mech. Engineering. and Indust. Management, R. Barroco 174, 4465-591 Leca do Balio. Prediction Of Formability In Sheet Metal Forming Processes Using A Local Damage Model. United States. doi:10.1063/1.2740804.
Teixeira, P., Santos, Abel, Cesar Sa, J., Andrade Pires, F., Barata da Rocha, A., and INEGI, Inst. of Mech. Engineering. and Indust. Management, R. Barroco 174, 4465-591 Leca do Balio. Thu . "Prediction Of Formability In Sheet Metal Forming Processes Using A Local Damage Model". United States. doi:10.1063/1.2740804.
@article{osti_21057378,
title = {Prediction Of Formability In Sheet Metal Forming Processes Using A Local Damage Model},
author = {Teixeira, P. and Santos, Abel and Cesar Sa, J. and Andrade Pires, F. and Barata da Rocha, A. and INEGI, Inst. of Mech. Engineering. and Indust. Management, R. Barroco 174, 4465-591 Leca do Balio},
abstractNote = {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.},
doi = {10.1063/1.2740804},
journal = {AIP Conference Proceedings},
number = 1,
volume = 908,
place = {United States},
year = {Thu May 17 00:00:00 EDT 2007},
month = {Thu May 17 00:00:00 EDT 2007}
}