ねじり応力を受けるタービン発電器ロータ軸材の寸法効果とき裂進展特性

概要

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The fatigue strength of large and small-scale smooth specimens of a turbine-generator rotor steel was examined under torsional loading. Shear strain behaviour and axial crack growth of Mode II on smooth specimens and notched specimens were investigated in relation to size effect of the rotor steel. Elastic-plastic shear stress-strain characteristics at notch root were analyzied by finite element method. The main conclusions are as follows; (1) Size effect factor defined by the ratio of fatigue limits between 100 and 10 mm diameters was 0.78 and agreed the value of JSME recomendation (2) Shear stress-strain of notch root under large scale yielding condition can be estimated by expanded Neuber's rule, using inelastic nominal stress-strain relationship. (3) Using the modified parameter √<EJ_<IIa>>, Mode II axial crack growth rate of smooth and notched specimens, in both elastic and plastic shear strain fields, was successfully expressed by linear regression lines.
一般社団法人日本機械学会の論文
1985-04-25