Prediction of failure in bending of an aluminium sheet alloy

Pradeau, A, Thuillier, S and Yoon, J W 2016, Prediction of failure in bending of an aluminium sheet alloy, International journal of mechanical sciences, vol. 119, pp. 23-35, doi: 10.1016/j.ijmecsci.2016.09.033.

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Title Prediction of failure in bending of an aluminium sheet alloy
Author(s) Pradeau, A
Thuillier, S
Yoon, J W
Journal name International journal of mechanical sciences
Volume number 119
Start page 23
End page 35
Total pages 13
Publisher Elsevier
Place of publication Amsterdam ,The Netherlands
Publication date 2016-12-01
ISSN 0020-7403
Keyword(s) Aluminium alloy
Tensile pre-strain
Parameter identification
Anisotropic elastic-plastic model
Rupture criterion
Summary This work is dedicated to numerical prediction of the bending of thin aluminium alloy sheets, with a focus on the material parameter identification and the prediction of rupture with or without pre-strains in tension prior to bending. The experimental database consists of i) mechanical tests at room temperature, such as tension and simple shear, performed at several orientations to the rolling direction and biaxial tension ii) air bending tests of rectangular samples after (or not) pre-straining in tension. The mechanical model is composed of the Yld2004-18p anisotropic yield criterion (Barlat et al. [3]) associated with a mixed hardening rule. The material parameters (altogether 21) are optimized with an inverse approach, in order to minimize the gap between experimental data and model predictions. Then, the Hosford-Coulomb rupture criterion is used in an uncoupled way, and the parameters are determined from tensile tests, both uniaxial and biaxial, with data up to rupture. In a second step, numerical simulations of the bending tests are performed, either on material in its original state or after pre-straining in tension, with pre-strain magnitudes increasing from 0.19 up to 0.3. The comparisons are performed on different outputs: load evolution, strain field and prediction of the rupture. A very good correlation is obtained over all the tests, in the identification step as well as in the validation one. Moreover, the fracture criterion proves to be successful whatever the amount of pre-strain may be. A convincing representation of the mechanical behavior at room temperature for an aluminium alloy is thus obtained.
Language eng
DOI 10.1016/j.ijmecsci.2016.09.033
Field of Research 091099 Manufacturing Engineering not elsewhere classified
090599 Civil Engineering not elsewhere classified
091399 Mechanical Engineering not elsewhere classified
Socio Economic Objective 970109 Expanding Knowledge in Engineering
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Elsevier
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