Optical and infrared coupled full-field measurements at a micrometric scale

Mechanical fields in a metallic sample are often considered homogeneous at the sample scale. Nevertheless, metallic materials are made of an aggregate of grains. Under mechanical loading, the grains undergo different levels of deformation according to their crystallographic orientation with respect to the loading axes. The deformation is thus heterogeneous at the mesoscopic scale of grains. Furthermore, it is well-known that thermal effects accompany deformation. It can thus be assumed that temperature is also heterogeneous at this scale. This study aims at observing the heterogeneities of kinematic and thermal data at the grain scale of a polycristal under cyclic loading.