Electrochemical measurement of fatigue damage
US4160702A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 1978 |
| Grant date | Jul 10, 1979 |
| Priority date | — |
| Expiry date | Apr 21, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N17/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Testing method for the early detection and assessment of metal fatigue damage prior to the initiation of fatigue cracks. Test parts are anodized to form an oxide coating thereon. The anodized parts are fatigue tested. Microcracks created in the oxide coating occur at the situs of deformations induced at the surface of the parts during testing. The location and extent of the microcracking is determined electrochemically by reanodizing the parts such as to anodically heal the microcracks and measuring the reanodization charge required for healing. Reanodizing incremental portions of the part point up areas of the part which allow higher current transients which in turn indicate the locations where fatigue damage is accumulating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.