G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 27/80 (2006.01) G01N 27/72 (2006.01) G01N 27/82 (2006.01)
Patent
CA 2390497
This invention is a method for nondestructively determining the deterioration of determining ferromagnetic materials by quantifying the change in brittleness with aging of the materials. This invention supposes acquirement of an embrittlement coefficient b by measuring a magnetic susceptibility .CHI. b of ferromagnetic materials under a magnetic field having a specified intensity H. And the coefficient b of the ferromagnetic materials is calculated by putting the intensity H and the susceptibility .CHI. b into an equation: b = .CHI.b H2. By the coefficient b, a correlation between the coefficient b and a referenced embrittlement factor of materials like said determining materials is obtained previously. Said coefficient b of said determining materials in the initial and the deteriorated states is acquired. The factor corresponding to the coefficient b is obtained from the correlation. It is possible to quantify the change by comparing the values of the factor in the initial and deteriorated states.
Iwate University
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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