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