ANSYS-based detailed thermo-mechanical modeling of complex thermoelectric power designs

Using Finite Element Analysis (FEA) via ANSYS Workbench simulation software, complicated coupled-field analyses of thermoelectric devices can be performed. This is effective in examining the thermo-mechanical stresses introduced in these devices through their operation. Due to the large temperature gradients inherent in their operation, as well as the mismatch in coefficients of thermal expansion, large stresses can be present during power generation. This stress can lead to device failure in several ways; the device may break, bowing of the system may lead to a loss in thermal contact between layers and subsequent reduction in heat transfer. FEA simulations examined the mechanical behavior of the device at operating temperatures, including; determination of the optimum pellet length for shear stress minimization, and modeling the behavior of Niobium compliance pads in the system.