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International Journal of Innovative Research and Development, Vol 1, No 3 (2012), Pagination: 28-35
Abstract
The present paper is a review of the past work done in the field of thermal fatigue analysis to study creep and analysis in a steam turbine blade using Finite Element analysis. The steam turbines operating at high temperatures are subjected transient temperatures during start up and shutdown operation which gives rise to thermal stresses. Repetition of these thermal transients can result in thermal fatigue of the component. An example of thermal fatigue is thermal shock, where sudden temperature changes occur at the internal or external surface of a component leading to cracking. The differential expansion between surface and bulk material caused by repeated thermal shocks can induce fatigue or cyclic creep damage and endurance. The temperature gradients that can be established in the transient state are generally higher than those that occur in the steady-state and hence thermal shock is important factor to be considered relative to ordinary thermal stress. Transients temperatures and stresses in the rotor during start _up and shut down cycles are evaluated using finite element analysis.
Keywords
Steam Turbine, Thermal Shock, Thermal Load, Creep, Endurance, FEA
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