One-shot measurement of thermal and kinematic ﬁelds from Infra-Red Image Correlation (IRIC)
LMT Cachan, ENS Cachan/CNRS UMR 8535/Univ. Paris 6/PRES
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Many materials are concerned by strain localization, for instance PLC phe¨ nomena, Luders’ bands or Shape Memory Alloys (SMA). The experimental identiﬁcation of such material behaviors requires the use of full ﬁeld kinematic measurements, such as provided by Digital Image Correlation (DIC), as well as Infra-Red (IR) thermography to evaluate the associate thermal dissipation. Jointly, these ﬁeld measurements allow for a full thermo-mechanical characterization of material behavior. However, the space and time association of both ﬁelds remains a major diﬃculty (antagonist surface texture requirements, imaging devices having diﬀerent pixel number and acquisition rate...). In this paper, we introduce a much simpler experimental approach, which consists in a novel extended DIC technique applied to a single set of IR images. It gives access to both displacement and temperature ﬁelds decomposed over the same discretization. This technique, applied to tensile tests on a NiTi SMA, reveals both strain localization due to the phase transformation and associated thermal dissipation.
© Owned by the authors, published by EDP Sciences, 2010