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Characterization of the thermomechanical behaviour of metals for high strain-rates, using ultra-high speed imaging cameras

Abstract : To this date, the experimental and analytical strategies allowing to characterize the visco-thermomechanical behaviour of materials subjected to extreme and complex loadings are limited. In this context, this thesis proposes to develop an innovative strategy combining heterogeneous tests, full-field measurements at ultra-high speed and a non-parametric stress field reconstruction method. The work of this thesis relies on the joint use of an ultra-high speed camera (Cordin-580) and a high speed infrared camera (Telops M3K), which present to date the best spatio-temporal resolutions of the market, to capture the thermomechanical fields during a heterogeneous test. To do so, dedicated methods allowing to measure with a high spatial sampling strains (uncertainty of 2 mm/m) and temperatures (uncertainty of 0.3 °C) for high acquisition speeds are developed. An experimental campaign allowing to cover large ranges of strain, strain-rate, temperature and triaxiality in a single test, while ensuring their measurability is then designed. Finally, the proposed test is analysed with an original method of stress field reconstruction which allows to characterize in a single test the visco-plastic response of a steel over a range of strain-rate from 10 per second to 500 per second with uncertainties of 10%, while providing loading paths that partially cover the shear and compression response. The combined evaluation of temperature and stress fields allow the local evaluation of energy, which will likely allow in the near future thermodynamically based models to be established using a reduced number of tests.
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https://hal.archives-ouvertes.fr/tel-03630289
Contributor : Adrien Vinel Connect in order to contact the contributor
Submitted on : Monday, April 4, 2022 - 10:48:12 PM
Last modification on : Monday, July 18, 2022 - 8:24:01 AM
Long-term archiving on: : Tuesday, July 5, 2022 - 8:32:09 PM

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Adrien Vinel. Characterization of the thermomechanical behaviour of metals for high strain-rates, using ultra-high speed imaging cameras. Solid mechanics [physics.class-ph]. Ecole Centrale de Nantes, 2022. English. ⟨NNT : ⟩. ⟨tel-03630289v1⟩

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