Analysis of Fretting Fatigue Strength of Integral Shroud Blade for Steam Turbine
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概要
- 論文の詳細を見る
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.
- 一般社団法人 日本機械学会の論文
著者
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Kaneko Yasutomo
Takasago R & D Center, Mitsubishi Heavy Industries, Ltd.
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Kurimura Takayuki
Takasago Research And Development Center Mitsubishi Heavy Industries Ltd
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Ohyama Hiroharu
Takasago Machinery Works Mitsubishi Heavy Industries Ltd.
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TOMII Masayuki
Takasago Research & Development Center, MITSUBISHI HEAVY INDUSTRIES, LTD.
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KURIMURA Takayuki
Takasago Machinery Works, MITSUBISHI HEAVY INDUSTRIES, LTD.
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