Applied and residual stress measurements using magnetic field sensors
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United States of America Patent
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May 5, 2009
Grant Date -
Sep 18, 2003
app pub date -
Jan 24, 2003
filing date -
Jan 25, 2002
priority date (Note) -
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Abstract
Methods are described for the use of conformable eddy-current sensors and sensor arrays for characterizing residual stresses and applied loads in materials. In addition, for magnetizable materials such as steels, these methods can be used to determine carbide content and to inspect for grinding burn damage. The sensor arrays can be mounted inside or scanned across the inner surface of test articles and hollow fasteners to monitor stress distributions. A technique for placing eddy-current coils around magnetizable fasteners for load distribution monitoring is also disclosed.
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