Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1990-02-05
1991-07-09
Myracle, Jerry W.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
7386221, F16B 3102
Patent
active
050294806
ABSTRACT:
This invention relates to a load indicating member comprising a shank having at least one groove and an ultrasonic transducer coupled to a load indicating member so that an ultrasonic wave is directed to the groove. A surface can be formed adjacent to one longitudinal end of the shank and the ultrasonic transducer can be coupled to this surface. Further, the ultrasonic transducer can be coupled to this surface so that the ultrasonic wave is also directed to the other longitudinal end of the shank which is remote from the surface. The groove may be located on the shank at a predetermined distance from the surface for identification of the member. Moreover, the surface can have a recess, with the ultrasonic transducer being located in the recess. Advantageously, the groove can be an annular groove or the groove can be comprised of threads disposed on the shank. Also, the shank can have two or more annular grooves. These grooves can be located on the shank at a predetermined distance apart for identification of the load indicating member. Preferably, the ultrasonic transducer is a piezoelectric film transducer. Additionally, the preferred load indicating member is a fastener in accordance with the present invention.
REFERENCES:
patent: 3918294 (1975-11-01), Makino et al.
patent: 4294122 (1981-10-01), Couchman
patent: 4295377 (1981-10-01), Couchman
patent: 4344216 (1982-08-01), Finkelston
patent: 4569229 (1985-02-01), De Halleux
patent: 4601207 (1986-07-01), Steblay
patent: 4846001 (1989-07-01), Kibblewhite
Final Report No. AFML-TR-78-138, "Acousto-Elastic Fastener Preload Indicator", by J. C. Couchman.
Dee James D.
Myracle Jerry W.
Nerenberg Aaron
SPS Technologies, Inc.
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