Abstract
The study deals with the reconstruction of heat sources originating from deformation processes in metals. A one-dimensional method to be applied on wires or bars is introduced and tested on superelastic NiTi wire subjected to force-controlled loading and unloading. Infrared thermography was used for this purpose. Thermal data were then processed by heat source reconstruction technique using a one-dimensional version of the heat diffusion equation. Attention was paid to the identification of the heat exchanges with the specimen’s environment, in particular by convection to the air of ambient temperature. The sensitivity of the method to the degree of spatio-temporal filtering was also tested. Finally, the localization of martensitic transformation in superelastic NiTi was evaluated using the proposed method. It is shown that under force-control regime the phase transformation proceeds in two time-shifted bursts, where each of bursts consists in several displaced and nearly simultaneous transforming zones. This transformation sequence is rationalized by fast latent heat release from the transforming zone upon load control regime, which leads to overheating of surrounding zones thus temporarily suppressing their transformation.
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Acknowledgements
This publication was supported by OP RDE, MEYS, under the project “European Spallation Source—participation of the Czech Republic—OP”, “Reg. No. CZ.02.1.01/0.0/0.0/16_013/0001794”. A.J. acknowledges the support received from the Agence Nationale de la Recherche of the French government through the program “Investissements d’Avenir” (16-IDEX-0001 CAP 20-25). M.K. would like to acknowledge financial support of the ERDF in the frame of the Project No. CZ.02.1.01/0.0/0.0/15_003/0000485.
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Jury, A., Balandraud, X., Heller, L., Alarcon, E., Karlik, M. (2020). One-Dimensional Heat Source Reconstruction Applied to Phase Transforming Superelastic Ni-Ti Wire. In: Baldi, A., Kramer, S., Pierron, F., Considine, J., Bossuyt, S., Hoefnagels, J. (eds) Residual Stress, Thermomechanics & Infrared Imaging and Inverse Problems, Volume 6. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-030-30098-2_6
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DOI: https://doi.org/10.1007/978-3-030-30098-2_6
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