Uniaxial compression tests are commonly performed in order to characterize material behoavior over a specific strain, strain rate and temperature range. Obtaining stress - strain curves is based on the assumption of homogeneous deformation which also implies a constant strain rate throughout the material. In the context of cylindrical samples, a swelling effect is observed, and can be considered a sign of heterogeneous deformation of the material. The numerical simulations carried out make it possible to affirmm that the friction between the machine and the sample and rheological parameters of the material have a strong influence on the intensity of the heterogeneities of deformation. The errors made during the identification of the material parameters with the hypothesis of homogeneous deformation are quantified according to the experimental conditions and the behavior of the sample. An identification method is developed in to approach the rheological parameters of the samples despite the heterogeneous deformation of the samples. This method is tested on experimental tests conducted on pure aluminium and 6000 series aluminium.
| Date | 10 Jul 2023 |
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| Original language | French |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Eric Feulvarch (Supervisor) & Philippe Bocher (Co-supervisor) |
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Villié, L. (Author), Feulvarch (Supervisor) &
Bocher (Co-supervisor),
10 Jul 2023Student thesis: Doctoral thesis › Doctorate in Engineering: Engineering