Method for nondestructively evaluating aged deterioration of...

Details Method for nondestructively evaluating aged deterioration of... Method for nondestructively evaluating aged deterioration of...

2005-03-22

2005-03-22

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

C324S224000

Reexamination Certificate

active

06868735

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 (σ) 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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patent: 6448764 (2002-09-01), Noe et al.
patent: 6631647 (2003-10-01), Seale

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