Reconstruction of heat sources induced in superelastically loaded Ni-Ti wire by localized deformation processes

0541725 - FZÚ 2022 RIV US eng J - Journal Article
Jury, Antoine - Balandraud, X. - Heller, Luděk - Šittner, Petr - Karlík, M.
Reconstruction of heat sources induced in superelastically loaded Ni-Ti wire by localized deformation processes.
Experimental Mechanics. Roč. 61, č. 2 (2021), s. 349-366. ISSN 0014-4851. E-ISSN 1741-2765
R&D Projects: GA ČR GA18-03834S
Institutional support: RVO:68378271
Keywords : infrared thermography * heat effect * material characterization * shape memory alloy * superelasticity * thermal diffusivity
OECD category: Applied mechanics
Impact factor: 2.794, year: 2021
Method of publishing: Limited access
https://doi.org/10.1007/s11340-020-00648-8

Shape memory alloys (SMAs) are phase transforming materials featuring strong thermomechanical couplings. Infrared thermography and heat source reconstruction (HSR) enable to track the calorific signature of deformation processes. Sequentially appearing patterns of localized transformation events of four types were identified and associated with martensite bands nucleations and their subsequent merging upon tensile loading. Analogically, the events associated with austenite bands nucleations and their subsequent merging were identified upon unloading. In addition, weak heat sources observed before and after the localized transformation events were associated with the homogeneous martensitic transformation. The intrinsic dissipation heat associated with the nucleation and merging events is estimated to be ~ 25% of the released/absorbed latent heat.
Permanent Link: http://hdl.handle.net/11104/0319254