Prediction of Forming Limits Based on a Coupled Approach Between Anisotropic Damage and Necking Models

This article presents an integrated approach for localized necking and failure prediction in sheet metal forming processes, based on the coupling between the anisotropic damage evolution law proposed by Lemaitre [1] and the modified maximum force criterion (MMFC) proposed by Hora et al [2]. To illus...

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Bibliographic Details
Main Authors: Teixeira, P, De Sa, J M A Cesar, Santos, A D, Pires, F M A, Da Rocha, A Barata
Format: Book
Language:English
Subjects:
Aluminum base alloys
Anisotropy
Criteria
Damage
Evolution
Failure
Formability
Forming
Fracture mechanics
Joining
Law
Limit strain
Mathematical models
Necking
Numerical prediction
Sheet metal
Softening
Strain
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Summary:This article presents an integrated approach for localized necking and failure prediction in sheet metal forming processes, based on the coupling between the anisotropic damage evolution law proposed by Lemaitre [1] and the modified maximum force criterion (MMFC) proposed by Hora et al [2]. To illustrate the essential features of the coupled approach, an aluminum alloy has been selected and numerical predictions have been compared with experimental forming limits, obtained for both linear strain paths evolutions. Numerical results show that the introduction of the softening behavior, caused by the increase of damage, into the necking criterion can play a significant role in triggering local necking, providing an improved prediction of the necking occurrence together with the capability of performing calculations of limit strains when they are governed by fracture rather than by local necking.
ISSN:0094-243X
DOI:10.1063/1.3457559