This paper reports a novel model for solving size-dependent three-dimensional thermoelastic contact behavior. The model accounts for the effects of local bending in microstructured materials and the interface heat flux on size-dependent thermoelastic contact behavior. Analytical expressions for the material response under unit heat flux and unit force have been derived within the framework of higher-order thermoelastic continuum theory. A semi-analytical contact model is established based on the conjugate gradient method and discrete convolution fast Fourier transform, which incorporates thermo-mechanical coupling effects at the contact interface and has no restrictions on the geometry of the contact surfaces. Based on the developed model, detailed parametric analyses have been conducted with two typical indenter shapes, spherical indenter and flat-ended cylindrical indenter, to discuss the combined effects of thermal expansion, size dependence, and material properties on microscale thermoelastic contact behavior.
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