Abstract
We present thermomechanical measurements obtained during the stretching of a polyamide: thermal data are given by infraredthermography and displacement fields are reached by digital image correlation. These two techniques are used simultaneously in orderto take into account the strong heterogeneity of the deformation process, commonly encountered in that kind of material where thermaldiffusivity is weak. The combined analysis of infrared and speckle images allows to estimate the local calorific energy-rates due to strainlocalisation in the necking lips during the tension, at room temperature, of a flat sample. The stress state is estimated in each cross-sectionof the sample using an isochoric transformation hypothesis. The softening observed on the macroscopic response of the sample is associatedhere to a structural effect because the section where necking initiates is always hardening