Method for nondestructively evaluating aged deterioration of ferromagnetic construction materials
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United States of America Patent
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Mar 22, 2005
Grant Date -
Jun 17, 2004
app pub date -
Oct 7, 2003
filing date -
Oct 9, 2002
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Abstract
Aged deterioration of ferromagnetic construction materials is nondestructively evaluated by applying to an evaluating material a magnetic field whose magnetic field amplitude is rather low, distinguishing various lattice defects, and quantifying them separately. A method includes obtaining a stress-strain relation in advance by a tensile test, evaluating a minor hysteresis loop (reference minor loop) while applying an applied stress (.sigma.) thereto, obtaining correlation between physical quantities for evaluating aged deterioration, obtaining a subject minor hysteresis loop (subject minor loop) by a tensile test, obtaining measured values of the physical quantities from the loop, and evaluating aged deterioration of the evaluating material from the measured values.
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