Abstract
Understanding the electrothermal-mechanical behavior of electronic interconnects is of practical importance in improving the structural reliability of electronic devices. In this work, we use the finite-element method to analyze the Joule-heating-induced thermomechanical deformation of a metallic sphere that is sandwiched between two rigid plates. The deformation behavior of the sphere is elastic–perfectly plastic with Young’s modulus and yield stress decreasing with temperature. The mechanical stresses created by Joule heating are found to depend on the thermal and mechanical contact conditions between the sphere and the plates. The temperature rise in the sphere for the diathermal condition between the sphere and the plates deviates from the square relation between Joule heat and electric current, due to the temperature dependence of the electrothermal properties of the material. For large electric currents, the simulations reveal the decrease of von Mises stress near the contact interfaces, which suggests that current-induced structural damage will likely occur near the contact interfaces.
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Liu, M., Yang, F. Finite-Element Analysis of Current-Induced Thermal Stress in a Conducting Sphere. J. Electron. Mater. 41, 352–361 (2012). https://doi.org/10.1007/s11664-011-1817-4
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DOI: https://doi.org/10.1007/s11664-011-1817-4