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Cyclic elastoplastic behaviour of 2198-T8 aluminium alloy welded panels

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Abstract

The friction stir welding (FSW) process generally induces a gradient of properties and a softer behaviour along the welded joint. To design aeronautical structures welded by FSW in fatigue, it is necessary to study the impact of this localized soft behaviour on the overall structure. In this study, the 2198-T8 hardening structural aluminium alloy is considered. Monotonic and cyclic mechanical tests are performed by combining conventional extensometric measurements with digital image correlation (DIC) to measure the local displacement fields around the welded zone. Based on these experimental data, constitutive equations are proposed and identified, zone by zone, across the welded joint. In parallel, a quantification of T1 (\(\hbox {Al}_{\mathrm {2}}\)CuLi) strengthening precipitates is performed in different regions of the joint with a transmission electron microscope in order to identify a relationship between the microstructure and the mechanical parameters. Finally, once all the material parameters are identified, the model is validated by a 3D finite element analysis representative of FSW samples.

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Acknowledgements

The authors would like to acknowledge Constellium for providing aluminium sheet metal.

Funding

This research was supported integrally by Onera (Office National d’Etudes et de Recherches Aérospatiales)

Author information

Authors and Affiliations

  1. CEA / Cadarache, TechnicAtome, Route de Vinon/Verdon, 13115, Saint Paul lez Durance, France

    Xavier Truant

  2. Centre des Matériaux, MINES ParisTech, CNRS UMR 7633, 10 rue Henri Desbruères, B.P. 87, 91003, Evry Cedex, France

    Georges Cailletaud

  3. IRT Jules Verne, Chemin du Chaffault, 44340, Bouguenais, France

    Florent Fournier Dit Chabert

  4. Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, 2 rue Henri Dunant, 94320, Thiais, France

    Ivan Guillot

  5. DMAS, ONERA, Univ Paris Saclay, F-92322, Châtillon, France

    Serge Kruch

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  1. Xavier Truant
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  2. Georges Cailletaud
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  3. Florent Fournier Dit Chabert
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Corresponding author

Correspondence to Serge Kruch.

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All authors declare that they have no conflict of interest.

Data availability

The datasets generated during the current study are not publicly available due to legal restrictions.

Code availability

Numerical analysis was performed with the Finite Element suite Zset developed by Ecole des Mines and Onera: http://www.zset-software.com.

Additional information

Communicated by Marcus Aßmus, Victor A. Eremeyev and Andreas Öchsner.

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Truant, X., Cailletaud, G., Fournier Dit Chabert, F. et al. Cyclic elastoplastic behaviour of 2198-T8 aluminium alloy welded panels. Continuum Mech. Thermodyn. 33, 1691–1707 (2021). https://doi.org/10.1007/s00161-021-01002-6

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  • DOI: https://doi.org/10.1007/s00161-021-01002-6

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