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:
Sep. 06, 1977
Filed:
Nov. 02, 1976
Bartholomew D Murphy, Marblehead, MA (US);
David C Gonyea, Schenectady, NY (US);
General Electric Company, Schenectady, NY (US);
Abstract
The useful life of a turbomachine part is affected by cyclic stresses which occur in the turbomachine part as a result of heating and cooling the turbomachine part. Each thermal cycle is comprised of a maximum heating stress and a maximum cooling stress which may occur during turbomachine start-up, load changes, shut-downs, or boiler excursions. The maximum heating stress and the maximum cooling stress for each cycle may be combined to define a stress range. The actual stress range for each cycle is compared with a calculated stress range curve for the turbomachine part to determine the amount of life expended during the cycle for the turbomachine part. This value may be expressed as a percent of life expended for the cycle. The life expended for each cycle is accumulated to provide an output indicative of the total percent life expended for the turbomachine part according to its operating history.