Device and method to detect cracks in the countersink of a fastener
US10234432B2 · kind B2 · utility
1Cited by
10References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 4, 2016 |
| Grant date | Mar 19, 2019 |
| Priority date | — |
| Expiry date | Dec 2, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/2694
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Disclosed are methods and systems to nondestructively detect cracks at or near a countersink of a fastener, such as a rivet, in a thin walled structure using Lamb waves. Generation and detection of Lamb waves at symmetric locations relative to the fastener provides signals used to calculate a symmetry parameter. The symmetry parameter represents a comparison of the relative amplitudes of the detected Lamb wave signals and provides a simple indication of whether a crack exists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.