Method of assessing bolted joint integrity
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United States of America Patent
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Mar 18, 2014
Grant Date -
Jun 16, 2011
app pub date -
Dec 14, 2010
filing date -
Dec 14, 2009
priority date (Note) -
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Abstract
A method of assessing bolted joint integrity. A guided wave is sent through a structure containing at least one bolted joint. The guided wave that is subsequently propagated through the structure and interacted with the bolted joint is measured to obtain a measured result. At least one parameter of the guided wave after its travel through the structure, and after having been affected by a nonlinear acoustic behavior of the bolted joint, is analyzed. Either at least one guided wave parameter is compared to a wave propagation pattern of the bolted joint at a correct torque level, or variation of at least one guided wave parameter is compared, to determine changes in wave propagation time and/or wave propagation shape. An incorrect torque level of the bolted joint is inferred from any changes that are determined.
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