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:
Aug. 03, 1982
Filed:
Aug. 25, 1980
Frank Massa, Hingham, MA (US);
The Stoneleigh Trust, Cohasset, MA (US);
Abstract
A test procedure and test apparatus is described for measuring the degradation in the physical integrity of a structural part by measuring the rate of decay of the amplitude of vibration of the part after it has been set into vibration at its free resonant frequency mode. The presence of invisible imperfections in the part such as may occur as a result of metal fatigue or from the development of tiny flaws or cracks will cause an increase in the rate of decay of the amplitude of vibration of the part. By making periodic measurements of the rate of decay of a structural part which is used in a critical highly stressed application subject to vibration such as a jet engine mount, the periodic degradation due to fatigue can be determined and the part is removed from service at a safe period before the degradation reaches an unsafe limit.