Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Threaded fastener stress
Patent
1997-05-02
2000-01-04
Brock, Michael
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Threaded fastener stress
73597, 73599, F16B 3102
Patent
active
060097590
ABSTRACT:
A load-indicating device including a load-bearing member adapted to deform when stressed. Ultrasonic waves are directed into one end of the load-bearing member and ultrasonic echoes are received at the same end by ultrasonic wave transmitting and receiving equipment. In one embodiment, ultrasonic waves are transmitted and received using an ultrasonic transducer disposed on either the head or the opposite end of the load-bearing member. The head, the end, the shank or a combination thereof are contoured to reduce the influence of geometric variations and asymmetrical stress in the load-bearing member on the ultrasonic measurement. A method is also provided, which encompasses a model, by which preferred geometries of the contoured surfaces of the load-bearing member can be designed. Also provided are a method of making a load-bearing member including contouring at least one end of a load-bearing member, or the shank to reduce the influence of geometric variations and asymmetrical stress in the load-bearing member on ultrasonic measurement, and a method of identifying a contour on a load-bearing member that will provide accurate and reliable ultrasonic load measurements.
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Kibblewhite Ian E.
Vecchio Christopher J.
Brock Michael
Fayyaz Nashmiya
Ultrafast, Inc.
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