Applied and residual stress measurements using magnetic field sensors

US7526964B2 · kind B2 · utility

Assignee

• JENTEK Sensors, Inc. · US

Inventors

• Neil J. Goldfine · Newton, US
• Vladimir A. Zilberstein · Sharon, US
• James Fisher · Walnut Creek, US
• David C. Grundy · Reading, US
• Darrell E. Schlicker · Watertown, US
• Vladimir Tsukernik · Dedham, US
• Robert Joseph Lyons · Niskayuna, US
• Ian Shay · Cambridge, US
• Andrew P. Washabaugh · Chula Vista, US

Key dates

• Filing date: Jan 24, 2003
• Grant date: May 5, 2009
• Expiry date: Jan 24, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L5/0047
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Methods are described for the use of conformable eddy-current sensors and sensor arrays for characterizing residual stresses and applied loads in materials. In addition, for magnetizable materials such as steels, these methods can be used to determine carbide content and to inspect for grinding burn damage. The sensor arrays can be mounted inside or scanned across the inner surface of test articles and hollow fasteners to monitor stress distributions. A technique for placing eddy-current coils around magnetizable fasteners for load distribution monitoring is also disclosed.