The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 27, 2010
Filed:
Aug. 14, 2007
Alexander Mahler, Kreuzlingen, CH;
Jian Chen, Brugg, CH;
Alexander Mahler, Kreuzlingen, CH;
Jian Chen, Brugg, CH;
Alstom Technology Ltd, Baden, CH;
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.