Analytical solution of the temperature-dependent thermoelastic problem induced by Joule heating and the presence of an elliptic cavity

Joule heat induced by electric current may well lead to thermal stress and contribute to structural failure and crack evolution in a range of modern materials. In this paper, we use complex variable methods to obtain the thermoelastic fields around an elliptic cavity in a plate subjected to remote electric and thermal loads. Of particular interest is the fact that we consider the temperature dependency of the corresponding thermoelastic coefficients. We introduce an analytical method which is verified by the fact that it leads to results which reduce to the classical analytical results in the literature when the thermoelastic coefficients are taken to be temperature-independent. We find that when the elliptic cavity is reduced to the representation of a linear crack, the corresponding stress intensity factor increases to a greater extent under the temperature-dependent assumption versus the corresponding classical results. Our findings are significant in forming the basis for the analysis of the evolution of crack growth under severe temperature gradients such as those occurring as a result of Joule heat loading.

Automated summary

This paper investigates the influence of Joule heat induced by electric current on thermal stress and structural failure by using complex variable methods to obtain the thermoelastic fields around an elliptic cavity. The temperature dependency of thermoelastic coefficients is considered, and an analytical method is introduced to verify the results. It is found that under the temperature-dependent assumption, the stress intensity factor increases to a greater extent when the elliptic cavity is reduced to a linear crack.