Electromagnetic acoustic transducer for bolt tension and load me

Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress

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73597, F16B 3102

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active

054995400

ABSTRACT:
A device for measuring a load on a part such as a bolt, comprises a socket having walls defining an interior space wherein the socket engages the bolt for transmitting a load to the bolt. An electromagnetic acoustic transducer comprising a magnet and a coil is located in the interior space of the socket near the bolt. The coil provides a current while the magnet provides a magnetic field such that the magnet and the coil generate an ultrasonic signal within the bolt. A detector is used to detect and measure a change in the ultrasonic signal at the bolt.

REFERENCES:
patent: 4434663 (1984-03-01), Peterson et al.
patent: 4522071 (1985-06-01), Thompson
patent: 4777824 (1988-10-01), Alers et al.
patent: 4846001 (1989-06-01), Kibblewhite
patent: 5058439 (1991-10-01), Carpenter
patent: 5154081 (1992-10-01), Thompson et al.
patent: 5220839 (1993-06-01), Peterson
G. A. Budenkov, V. N. Kuyatkoskii, and Yu V. Petrov, "Oblique Radiation of Ultrasound by an Electromagnetic-Acoustical Method", Defektoskopia, No. 1, pp. 45-50, Jan.-Feb. 1973.
R&D Proposal #93-038 to U.S. Army Tank Command, Warren, Mich., Mar. 17, 1993, Proposal marked "Proprietary".
Same Proposal as in "A" to NASA--Kennedy Space Center, Apr. 7, 1993, Proposed marked Proprietary.
NASA Tech Briefs MSC-21786, admitted prior art.
A. C. Holt, B. Cummingham, G. C. Johnson, & D. Auslander, "Review of Progress in Quantitative Nondestructive Evaluation", Ed. by D. O. Thompson & D. E. Chementi (Plenum Press, New York 1987), vol. 6B, pp. 1549-1557.
A. C. Holt, B. Cummingham, & G. C. Johnson, "Review in Quantitative Nondestructive Evaluation", edited by D. O. Thompson and D. E. Chementi (Plenum Press, New York 1988), vol. 7B, pp. 1405-1412.
Fred R. Rollins, Jr., "International Advances in Nondestructive Testing" (Gordon and Breach Science Publishers, Inc. 1977), vol. 5, pp. 229-253.

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