過回転による中心孔周りの圧縮残留応力均一化を目的としたタービンロータディスク構造の最適化

概要

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To improve the fracture strength and fatigue life, compressive residual stress is induced around the center hole of turbine rotor disks by means of over-speed rotation. An optimum rotor-disk structure -a reverse-tapered structure to induce equal compressive residual stress around the center hole- was developed. Over-speed rotational tests were performed on several rotor disks based on the optimum structure, and the residual stress and radial residual deformation of the center hole were measured. Moreover an elastic-plastic finite element analysis gave residual-stress and radial-residual-deformation values close to the experimental ones. Therefore, it is suggested that adopting the reverse-tapered structure can equalize the residual-stresses on the surface of the center hole, and improve the fracture strength and fatigue life of the center hole effectively.
社団法人日本ガスタービン学会の論文
2004-01-20