Nondestructive fatigue test method for ferromagnetic construction materials
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United States of America Patent
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Jul 23, 2002
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N/A
app pub date -
Nov 3, 2000
filing date -
Nov 8, 1999
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Expired
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Abstract
A nondestructive test method determines the degree of metal fatigue of test ferromagnetic construction materials by quantifying a change in effective stress due to aging of the test materials. The disclosed method is to measure the coercive force Hc and the magnetic susceptibility .chi..sub.H of the test materials at the field of the coercive force Hc. A current tensile stress .sigma. by putting the coercive force Hc and the magnetic susceptibility .chi..sub.H into the following first equation: .sigma.=a(Hc/.chi..sub.H).sup.n. where a and n are known constants determined by the internal structure of the test materials. A change in current tensile stress of the test materials is determined by comparing the effective tensile stress .sigma. of the test materials with the initial tensile stress .sigma..sub.0 of the test materials.
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