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http://dx.doi.org/10.3795/KSME-B.2013.37.12.1153

Damage Analysis for Last-Stage Blade of Low-Pressure Turbine  

Song, Gee Wook (Korea Electric Power Corporation, Research Institute)
Choi, Woo Sung (Korea Electric Power Corporation, Research Institute)
Kim, Wanjae (Korea Electric Power Corporation, Research Institute)
Jung, Nam Gun (Korea Electric Power Corporation, Research Institute)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.37, no.12, 2013 , pp. 1153-1157 More about this Journal
Abstract
A steam turbine blade is one of the core parts in a power plant. It transforms steam energy into mechanical energy. It is installed on the rim of a rotor disk. Many failure cases have been reported at the final stage blades of a low-pressure (LP) turbine that is cyclically loaded by centrifugal force because of the repeated startups of the turbine. Therefore, to ensure the safety of an LP steam turbine blade, it is necessary to investigate the fatigue strength and life. In this study, the low cycle fatigue life of an LP steam turbine blade is evaluated based on actual damage analysis. To determine the crack initiation life of the final stage of a steam turbine, Neuber's rule is applied to elastic stresses by the finite element method to calculate the true strain amplitude. It is observed that the expected life and actual number of starts/stops of the blade were well matched.
Keywords
Steam Turbine; Low Pressure Turbine Blade; Low-Cycle Fatigue; Stress Analysis;
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