Stress relieved dovetail
AssigneeGeneral Electric Company
InventorsAndrew J. Lammas, William T. Dingwell, Anthony E. Hungler
Life of this patent
Estimating the term…
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.
Claims19
A gas turbine engine rotor blade mountable in a rotor disk slot, comprising:
- an airfoil;
- a platform integrally joined to said airfoil;
- and
- a dovetail integrally joined to said platform, and including a single neck of minimum cross sectional area extending between a pair of dovetail lobes configured to engage said disk slot;
- each of said lobes including an outer face facing outwardly to engage corresponding inner faces of said disk slot;
- and
- an undercut extending between at least one of said outer faces and said neck for introducing a stress concentration thereat.
A method of relieving stress in a circumferential dovetail of a rotor blade mounted in a complementary slot in a rotor disk comprising introducing a stress concentration between at least one of a single pair of dovetail lobes and an adjacent dovetail neck.
A gas turbine engine rotor blade mountable in a rotor disk slot, comprising:
- an airfoil;
- a platform integrally joined to said airfoil;
- and
- a dovetail integrally joined to said platform, and including a neck of minimum cross sectional area extending between a single pair of dovetail lobes configured to engage said disk slot;
- each of said lobes including an outer face facing outwardly to engage corresponding inner faces of said disk slot, with each outer face having an outer edge of contact for breaking away from said inner faces;
- and
- an undercut extending between at least one of said outer faces and said neck for introducing a stress concentration thereat, and having a discontinuous transition at a respective one of said edges of contact.
Dependencies are inferred from the claim text.