Thermomechanical analysis of shape memory alloys from full-field measurement techniques Seminar

Shape-memory alloys (SMAs) are metallic materials featuring specific mechanical properties triggered by the temperature and the stress applied to the material: superelasticy, one-way and two-way shape memory effects, good damping property, each of these properties strongly varying with the temperature as a function of the SMA characteristics (composition, process...). These properties result from a reversible austenite-martensite phase change that occurs within the material when it is subjected to a mechanical load or a temperature change. In the last decades, innovative technologies based on SMA have been developed in various domains such as medicine, robotics, aerospace, sport... The phase transition phenomenon in SMAs is characterised by a transformation strain and a latent heat production, making relevant the analysis of their thermomechanical responses with non-contact full-field measurement techniques. The presentation will present several applications of infrared thermography and grid method for the analysis of SMAs, with a focus on the martensitic microstructures developing in the samples.