期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2014
卷号：3
期号：6
页码：13597
出版社：S&S Publications
摘要：A steam turbine rotating system is loaded with time by the changes in stress levels as a result of start-upand shutdown procedures.Many of the most serious damage mechanisms in blades occur in the phase transition zone(PTZ) This region typically starts in low pressure (LP) turbines and fails typically because of low cycle fatigue andcreep. The purpose of this paper is to investigate the low cycle fatigue failure of low pressure steam turbine blade,particularly near PTZ. The present work is primarily focused developing a technique to assess low cycle fatigue life ofthe blade and to determine the number of startups and shutdown cycles. Two approaches were employed. Firstapproach is based on the elastic finite element (FE) analysis. Second approach is based on elastic-plastic FE analysis.Strain amplitude is determined directly from the FE analysis and fatigue life is assessed Morrow’s equation. Creep lifedue to strainhardening is also assessed by using creep laws.
