Nondestructive detection of stress
US4048847A · kind A · utility
10Cited by
3References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1976 |
| Grant date | Sep 20, 1977 |
| Priority date | — |
| Expiry date | Jul 14, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2291/0427
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Stress is detected by magnetostrictively generating vibrations which are detected at a location spaced from the region of generation. The efficiency of the generation is indicative of stress if the region is magnetically biased to less than maximum amplitude for the vibrations as produced. Preferably, the needed bias for generating vibrations at a constant level is used as stress indicator. Due to reciprocity of magnetostriction, the efficiency of generating magnetic oscillations by means of elastic vibrations in a biased region can be detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.