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Investigations on the Portevin Le Chatelier critical strain in an aluminum alloy

Abstract : The critical condition for the occurrence of serrations during Portevin-Le Chatelier (PLC) effect is investigated in this work. Some experimental tensile results on an Al-Mg aluminum alloy (AA5754) are recalled. The mechanical model for strain ageing proposed by MacCormick (1989) [1] to simulate the PLC effect is described, and the critical condition usually associated to this model is discussed. This condition is shown to fail at predicting the occurrence of PLC bands in finite element (FE) simulations based on this model. An alternative loss of stability condition is proposed, which is in accordance with simulation results. This condition is used for the identification of strain ageing model parameter for Al-Mg alloy.
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00658646
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mardi 10 janvier 2012 - 17:53:24
Dernière modification le : jeudi 24 septembre 2020 - 18:30:07

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Matthieu Mazière, H. Dierke. Investigations on the Portevin Le Chatelier critical strain in an aluminum alloy. Computational Materials Science, Elsevier, 2012, 52, pp.68-72. ⟨10.1016/j.commatsci.2011.05.039⟩. ⟨hal-00658646⟩

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