Patent ID: 6868735
Filing Date: 2005-03-22
Classification: G01N

Abstract:
1. A method for nondestructively and quantitatively evaluating aged deterioration of evaluating ferromagnetic construction materials, the steps of comprising: an evaluation information acquiring step of obtaining a stress-strain relation in advance by a tensile test with respect to a test piece which is made of the same evaluating ferromagnetic construction material (evaluating material), evaluating a minor hysteresis loop (reference minor loop) of the test piece while applying an applied stress (σ) thereto, the applied stress (σ) being appropriately determined according to the stress-strain relation, and obtaining correlation between physical quantities for evaluating aged deterioration of the evaluating material; a measurement step of obtaining a subject minor hysteresis loop (subject minor loop) by a tensile test with respect to the evaluating material and obtaining measured values of said physical quantities from the loop; an evaluation step of evaluating aged deterioration of the evaluating material from said measured values of said physical quantities obtained in the measurement step, according to said correlation between said physical quantities obtained in the foregoing evaluation information acquiring step: the minor hysteresis loops are obtained with respect to each the magnetic field amplitude (H