Stress relieved dovetail

Fluid reaction surfaces (i.e. – impellers) – Rotor having flow confining or deflecting web – shroud or... – Axially extending shroud ring or casing

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Details

416215, 416216, 416218, 416219R, 416220R, 416248, F01D 530

Patent

active

060331852

ABSTRACT:
A rotor blade includes an airfoil, an integral platform, and a dovetail integrally joined to the platform. The dovetail includes a neck extending between a pair of dovetail lobes configured to engage a complementary slot in a rotor disk. The dovetail includes an undercut extending between an outer face of the dovetail lobes and the neck for introducing a stress concentration thereat. The stress concentration relieves stress at the outer face at the expense of the neck for increasing the high cycle fatigue life of the blade.

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patent: 5435694 (1995-07-01), Kray et al.
patent: 5554005 (1996-09-01), Nguyen
patent: 5741119 (1998-04-01), Heppenstall

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