Method and apparatus for detection and characterization of mechanical damage
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United States of America Patent
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Feb 24, 2015
Grant Date -
Jul 3, 2014
app pub date -
Oct 30, 2013
filing date -
Oct 30, 2012
priority date (Note) -
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Abstract
Yield stress is an important indicator of the strength of a component such as a pipe section. A method and apparatus for measuring yield stress of components made from magnetic materials is provided. The magnetic permeability of the material is recorded at multiple stress levels below yield establishing a permeability-stress relationship. The yield stress is then estimated as a function of the recorded permeability-stress relationship. The permeability stress relationship may be non-linear for a range of stress levels, achieving a peak permeability response for a stress below yield. The yield stress may be estimated as a multiple of the stress at which the peak permeability response is recorded.
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