Analysis of Fretting Fatigue Strength of Integral Shroud Blade for Steam Turbine
To improve the reliability and the thermal efficiency of LP (Low Pressure) end blades of steam turbine, new standard series of LP end blades have been developed. The new LP end blades are characterized by the ISB (Integral Shroud Blade) structure. In the ISB structure, blades are continuously coupled by blade untwist due to centrifugal force when the blades rotate at high speed. One of the probable failure modes of the ISB structure seems to be fretting fatigue, because the ISB utilizes friction damping between adjacent shrouds and stubs. Therefore, in order to design a blade with high reliability, the design procedure for evaluating the fretting fatigue strength was established by the model test and the nonlinear contact analysis. This paper presents the practical design method for predicting the fretting fatigue strength of the ISB structure, and the some applications are explained.
Blade Vibration Fretting fatigue Vibratory stress Nonlinear analysis
Yasutomo KANEKO Masayuki Tomii Hiroharu Ohyama Takayuki Kurimura
Takasago Research & Laboratory Center MITSUBISHI HEAVY INDUSTRIES, LTD.,2-1-1 Shinhama Arai-Cho, Tak Takasago Machinery Works MITSUBISHI HEAVY INDUSTRIES, LTD.,2-1-1 Shinhama Arai-Cho, Takasago Hyogo 6 Takasago Machinery Works MITSUBISHI HEAVY INDUSTRIES, LTD., 2-1-1 Shinhama Arai-Cho, Takasago Hyogo
国际会议
2007杭州国际动力工程会议(The International Conference on Power Engineering 2007)
杭州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）