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Calorific signature of PLC bands under biaxial loading conditions in Al-Mg alloys

Abstract : This paper investigates the thermomechanical behavior of Al-Mg alloys submitted to biaxial loading until fracture. The study aims to characterize calorimetric signature accompanying the formation and propagation of Portevin-Le Chatelier (PLC) bands induced by such a loading condition. Full kinematic and thermal fields on the specimen surface were characterized by using Digital Image Correlation (DIC) and infrared thermography (IRT). Heat source field was reconstructed from the temperature field and the heat diffusion equation. The heat source map enables us to visualize spatio-temporal gradients in the calorimetric response of the material and to investigate the kinematics of PLC bands induced by equibiaxial tensile loading. Under certain conditions, heat source maps can be seen as mechanical dissipation maps. At the specimen centre, the heat source exhibits jumps that fit with jumps of temperature and equivalent deformation rate.
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Jean-Benoit Le Cam, Eric Robin, L. Leotoing, D. Guines. Calorific signature of PLC bands under biaxial loading conditions in Al-Mg alloys. 2017 Annual Conference on Experimental and Applied Mechanics, 2017, Indianapolis, United States. pp.29-35, ⟨10.1007/978-3-319-62899-8_5⟩. ⟨hal-01671671⟩

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