Estimation of Thermal Contact Resistance Using Ultrasonic Waves

In this paper, numerical simulations of both the three-dimensional heat conduction and two-dimensional elastic wave propagation at the iInterface of contact solids have been carried out. Numerical results of heat conduction simulations show that both the true contact area and thermal contact conductance increase linearly with an increase in the contact pressure. Numerical results of the ultrasonic wave propagation show that the iIntensity of a transmitted wave is very weak but depends clearly on the contact pressure. On the other hand, the iIntensity of reflected wave amounts to more than 99% of the standard reflected wave that results from the case of one cylindrical specimen without contact. However, the iIntensity of the modified reflected wave defined by the difference between the reflected wave and standard reflected wave shows the same tendency as that of the transmitted wave. The iIntensities of both transmitted and modified reflected waves could be expressed by the same power function of the contact pressure. By comparing the results of heat conduction with those of ultrasonic propagation calculations, a power functional correlation between the thermal contact conductance and transmitted or modified reflected iIntensity has been obtained. Using this correlation, it will be possible to estimate the thermal contact conductance between two solids through measuring the iIntensity of either reflected or transmitted ultrasonic waves.