NiTi shape memory alloys have amazing properties due to a reversible martensitictransformation and are widely used by biomedical industries and as actuators. The firstpart of this study deals is a thermomechanical analysis of the material, based on kinematical(with digital image correlation) and thermal (with infrared camera) field measurements.An important part of this work deals with the improvement of the heat sources estimationfrom thermal fields. For this, thermal heat capacities and conductivities of austeniteand martensite were estimated with several experimental methods. Then, the heat sourceestimation method was validated from virtual data obtained numerically and from experimentaldata obtained during a martensitic transformation induced by natural cooling.This first part is concluded with the use of this technique to study shear tests. The secondpart of this study is a contribution to the realization of architectured materials composedof linked stacked tubes. Our study deals with the realization and the characterization ofthe NiTi link, realized by resistance welding.
