Electrothermal stress in conducting particulate composites |
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Authors: | Fuqian Yang Linan An |
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Affiliation: | (1) Department of Chemical and Materials Engineering, University of Kentucky, Lexington, KY, USA;(2) Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816, USA |
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Abstract: | Electrothermal–mechanical interaction plays an important role in controlling the performance of electromechanical structures and field-assisted processes. The understanding of electrothermal–mechanical behavior of a material requires the analyses of Joule heating and thermomechanical deformation. In this study, we analyze the current-induced thermal stress in a conducting composite consisting of conducting spherical inclusions at dilute concentration. Assuming that there is no interaction among conducting inclusions, we obtain closed-form solutions of local temperature and thermal stress. The thermal stress created by Joule heating is proportional to the square of electric current density (electric field intensity) and the von-Mises stress reaches the maximum value at the interface between the spherical inclusion and the matrix. Large electric current will likely cause local delamination along the interface. |
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