Ultrasonic method to verify the interference fit of fasteners

Measuring and testing – Vibration – Resonance – frequency – or amplitude study

Reexamination Certificate

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C073S597000, C073S598000, C073S602000

Reexamination Certificate

active

07730784

ABSTRACT:
Embodiments of techniques to verify the interference fit of fasteners are disclosed. In one embodiment, a method includes aligning a probe proximate a fastener, the fastener being disposed within a material. A dynamic stress signal is generated from the probe using a low frequency transducer, and the dynamic stress signal is interrogated after it passes between the fastener and the material. An interference fit is then determined based on the interrogated dynamic stress signal.

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Koshti, “Simulation of Ultrasonic Preload Measurement on a Bolt in an Interference Fit Joint”, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, Mar. 2002, Newport Beach, USA, Proceedings of SPIE, vol. 4702, pp. 423-437.
PCT Intl Search Report and Written Opinion for application No. PCT/US2008/072021, dated May 18, 2009, 14 pgs.

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