Electricity: measuring and testing – Magnetic – Stress in material measurement
Patent
1989-05-22
1991-04-30
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Stress in material measurement
G01B 724, G01R 3318
Patent
active
050121898
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.
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Iowa State University & Research Foundation, Inc.
Snow Walter E.
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