Abstract
In this paper, the thermoelastic damping of the in-extensional vibration of rings is analyzed by dual-phase-lagging generalized thermoelasticity theory. In this work, the Q-factor for thermoelastic damping is derived. The effect of the ring radius and thickness, the rotating speed, mode numbers and ambient temperatures are discussed. This work represented that the lengths of the ring, the speed of the rotation and the relaxation times of the dual-phase-lagging have significant effects on the thermo-mechanical damping parameter.