Method and apparatus for measuring the stress or strain of a...

Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Mechanical measurement system

Reexamination Certificate

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Reexamination Certificate

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07953562

ABSTRACT:
A method and apparatus for measuring stress or strain in a portion of a ferromagnetic member is disclosed in which advantage is taken of the fact that the magnetic properties of a ferromagnetic member change with applied tensile or compressive stress. A magnetic hysteresis loop is measured in a portion of a ferromagnetic member and a model of a magnetic hysteresis loop is fitted to the measured magnetic hysteresis loop by varying at least one stress or strain dependent model variable and the fitted at least one variable is used to determine the stress or strain of the portion. The particular model disclosed is a predator/prey pursuit model wherein the prey is the applied field and the predator is the flux density.

REFERENCES:
patent: 3535625 (1970-10-01), Pratt
patent: 5195377 (1993-03-01), Garshelis
patent: 6424149 (2002-07-01), Takahashi
patent: 2001/0007422 (2001-07-01), Noe et al.
patent: 2002/0157478 (2002-10-01), Seale
patent: 1098194 (2001-05-01), None
patent: 1431759 (2004-06-01), None
patent: 9014574 (1990-11-01), None
patent: 9924803 (1999-05-01), None
GB0517815.7 Search Report dted Dec. 13, 2005, 1 page.
PCT/GB2006/003217 International Search Report dated Oct. 31, 2006, 2 pages.

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