Method for increasing the fatigue life of a blade root of a turbomachine blade
US7761993B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2007 |
| Grant date | Jul 27, 2010 |
| Priority date | — |
| Expiry date | Apr 13, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49748
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for increasing the fatigue life of a blade root of a turbomachine blade, wherein the blade root has at least one slot for back-gripping fixing of the blade root in a shaft component or a casing component of a turbomachine. The method comprises impressing a mechanical stress field in the notch root in a section of the slot, wherein the impressed mechanical stress field brings about a plastic deformation of the notch root. The impressed mechanical stress field is then progressively moved in the slot longitudinal direction of the slot. After this, the impressed mechanical stress field is removed again, wherein residual compression stresses remain in the notch root of the slot in the region of the slot in which the mechanical stress field was impressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.