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Title: Prediction of Ductile Failure in the Stretch-Forming of AA2024 Sheets

Abstract

A number of ductile failure criteria are nowadays being used to predict the formability of aluminium alloy sheets. Generally speaking, integral criteria (e.g. those proposed by Cockcroft and Latham, Brozzo et al., Oyane et al Chaouadi et al., etc.) have been probed to work well when the principal strains are of opposite sign, i.e. in the left side of the Forming Limit Diagram (FLD). However, when tensile biaxial strains are present, as occurs in stretch-forming practice, their predictions are usually very poor and even non-conservatives. As an alternative, local criteria, such as the classical Tresca's and Bressan and Williams' criteria, have demonstrated a good capability to predict the failure in some automotive aluminum alloys under stretching. The present work analyses experimentally and numerically the failure in AA2024-T3 sheets subjected to biaxial stretching. A series of out-of-plane stretching tests have been simulated using ABAQUS. The experimental and the numerical FLD for different failure criteria are compared. The influence on the failure of the hydrostatic pressure and the normal stress to the fracture plane is also discussed.

Authors:
; ;  [1]
  1. Departamento de Ingenieria Mecanica y de los Materiales, Escuela Superior de Ingenieros Industriales, Universidad de Sevilla, Camino de los Descubrimientos, s/n, 41092 - Sevilla (Spain)
Publication Date:
OSTI Identifier:
21057362
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: 10.1063/1.2740801; (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; ALUMINIUM ALLOYS; COMPUTERIZED SIMULATION; DUCTILITY; FRACTURES; MATERIALS WORKING; NUMERICAL ANALYSIS; SHEETS; STRAINS; STRESSES; TESTING

Citation Formats

Vallellano, C., Guzman, C., and Garcia-Lomas, F. J. Prediction of Ductile Failure in the Stretch-Forming of AA2024 Sheets. United States: N. p., 2007. Web. doi:10.1063/1.2740801.
Vallellano, C., Guzman, C., & Garcia-Lomas, F. J. Prediction of Ductile Failure in the Stretch-Forming of AA2024 Sheets. United States. doi:10.1063/1.2740801.
Vallellano, C., Guzman, C., and Garcia-Lomas, F. J. Thu . "Prediction of Ductile Failure in the Stretch-Forming of AA2024 Sheets". United States. doi:10.1063/1.2740801.
@article{osti_21057362,
title = {Prediction of Ductile Failure in the Stretch-Forming of AA2024 Sheets},
author = {Vallellano, C. and Guzman, C. and Garcia-Lomas, F. J.},
abstractNote = {A number of ductile failure criteria are nowadays being used to predict the formability of aluminium alloy sheets. Generally speaking, integral criteria (e.g. those proposed by Cockcroft and Latham, Brozzo et al., Oyane et al Chaouadi et al., etc.) have been probed to work well when the principal strains are of opposite sign, i.e. in the left side of the Forming Limit Diagram (FLD). However, when tensile biaxial strains are present, as occurs in stretch-forming practice, their predictions are usually very poor and even non-conservatives. As an alternative, local criteria, such as the classical Tresca's and Bressan and Williams' criteria, have demonstrated a good capability to predict the failure in some automotive aluminum alloys under stretching. The present work analyses experimentally and numerically the failure in AA2024-T3 sheets subjected to biaxial stretching. A series of out-of-plane stretching tests have been simulated using ABAQUS. The experimental and the numerical FLD for different failure criteria are compared. The influence on the failure of the hydrostatic pressure and the normal stress to the fracture plane is also discussed.},
doi = {10.1063/1.2740801},
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}
}