  Using the finite element method we quantitatively analyse temperature field
evolution in a viscoelastic solid undergoing a loading--unloading process. In
particular we investigate the temperature field inside a Kelvin--Voigt type
viscoelastic body with a thin cutout. We find that the viscosity significantly
contributes to the temperature field changes, and that the temperature field
changes initiated by the loading--unloading process are strongly concentrated
at the tip of the thin cutout. The predicted temperature field qualitatively
corresponds to the temperature field observed in experiments focused on
simultaneous heat and strain measurements at the crack tip inside materials
such as the filled rubber.
