Laser shock peened dovetails for disks and blades

Details Laser shock peened dovetails for disks and blades Laser shock peened dovetails for disks and blades

1994-10-06

1998-12-08

Look, Edward K.

Fluid reaction surfaces (i.e., impellers)

Specific working member mount

Blade received in well or slot

416222, F01D 530

Patent

active

058460543

ABSTRACT:
A dovetail assembly for mounting blades with dovetail roots axially into disk dovetail slots around a disk periphery which is subject to a tensile stress field due to centrifugal and thermal growth induced forces generated by the rotor when the rotor is rotating. The dovetail assembly has stress risers each in the form of a transition fillet between a neck or an area of minimum width and a pressure face which is designed to be a contact surface between complementary blade dovetail roots and disk dovetail slots formed between adjacent disk posts. The region around the stress riser has deep compressive residual stresses imparted by laser shock peening and is radially adjacent the stress riser and extends inward from a laser shocked surface of the component along the transition fillet.

REFERENCES:
patent: 5073212 (1991-12-01), Frohlich
Publication, "Laser shock processing Increases the fatgue Life of Metal Parts" Materials & Processing report. Sep. 1991.

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