A new approach to estimate heat fields during stress or temperature induced phase transformation on a NiTi SMA - Experimental validation

Vincent Delobelle (1) , Hervé Louche (2) , Denis Favier (1)

1 3SR - Laboratoire sols, solides, structures - risques [Grenoble]
2 ThM2 - ThermoMécanique des Matériaux

Positive or negative heat variations during a thermal induced phase transformation on a NiTi SMA are generally obtained from DSC. However, using (i) infrared thermal field measurements, (ii) 2D heat diffusion equation, and (iii) image processing, it is possible to get heat source fields associated with the transformations. Already applied to study localized stress induced phase transformations during tensile tests, we propose to use this method to estimate local heat during a thermal induced transformation. An original experimental setup is achieved in order to load and observe the transformations in uniform (0D) or non uniform (1D) configurations. After data processing, heat evolutions measured in 0D and 1D, are finally compared with reference DSC.

Domaines: Matériaux; Matériaux et structures en mécanique [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Mécanique des matériaux [physics.class-ph]; Mécanique des matériaux [physics.class-ph]

Vincent Delobelle, Hervé Louche, Denis Favier. A new approach to estimate heat fields during stress or temperature induced phase transformation on a NiTi SMA - Experimental validation. International Conference on Shape Memory and Superelastic Technologies (SMST), Nov 2011, Hong Kong SAR China. ⟨hal-00811423⟩