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Title:
MINIMIZING THE EFFECT OF BENDING ON ULTRASONIC MEASUREMENTS IN A LOAD-BEARING MEMBER
Document Type and Number:
WIPO Patent Application WO1997044644
Kind Code:
A3
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.

Inventors:
KIBBLEWHITE IAN E
VECCHIO CHRISTOPHER J
Application Number:
PCT/US1997/007854
Publication Date:
February 05, 1998
Filing Date:
May 05, 1997
Export Citation:
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Assignee:
ULTRAFAST INC (US)
International Classes:
F16B31/02; G01L5/00; G01L5/24; (IPC1-7): G01L/
Foreign References:
US5029480A1991-07-09
US4569229A1986-02-11
US5156050A1992-10-20
US5499540A1996-03-19
US4601207A1986-07-22
Other References:
HEYMAN J S ET AL: "Ultrasonic measurement of axial stress", SYMPOSIUM ON ULTRASONIC MEASUREMENTS OF STRESS, PHILADELPHIA, PA, USA, 9 APRIL 1981, vol. 10, no. 5, ISSN 0090-3973, JOURNAL OF TESTING AND EVALUATION, SEPT. 1982, USA, pages 202 - 211, XP002047485
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