Thermomechanical coupling is studied in dynamic fracture mechanisms. The crack propagation problem is formalized within the framework of the thermodynamics of irreversible processes to determine their essential parameters and couplings. The analytical approach developed herein is based on the linear elastic mechanics of fracture, including the inertial effects and thermomechanical couplings. For a one-dimensional restriction, the mechanics and thermics equations are uncoupled in the entire structure, with simplified thermomechanical coupling at the crack-tip. This study aims to determine the criteria for fracture initiation and propagation in the presence of heating and inertial effects.