Method for deriving information regarding stress from a stressed ferromagnetic material
US5012189A · kind A · utility
6Cited by
19References
6Claims
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Key dates
| Filing date | May 22, 1989 |
| Grant date | Apr 30, 1991 |
| Priority date | — |
| Expiry date | May 22, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-destructive evaluation technique for deriving stress in ferromagnetic materials including deriving anhysteretic and hysteresis magnetization curves for the material in both unstressed and stressed states. The anhysteretic curve is expressed as a Langevin function. The stress is expressed as an equivalent magnetic field dependent on stress and change of magnetostriction with magnetization. By measurement of these bulk magnetic properties, stress can be derived.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.