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Proceedings Paper

Simulation of ultrasonic measurement on a bolt in a shear joint
Author(s): Ajay M. Koshti
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Paper Abstract

An instrument called the ultrasonic extensometer is used to measure tensile preload in bolts used in structural joints. In this paper, the same instrument is used in a different way to measure change in the ultrasonic measurements due to bending in the bolts. A theory and numerical model for the ultrasonic measurements are developed. The bending load results in a rotation and translation of the ultrasonic pulse reflecting face. The load also creates a stress gradient in the bolt. This results in a phase variation (or gradient) in the received ultrasonic beam across the face of transducer. The load also results in a physical shift in the received beam relative to the ultrasonic transducer. The phase gradient and shift in the beam cause a change in the pulse transit time. A numerical example chooses a bolt whose experimental preload characteristic had been published previously by the author. The example displays simulated ultrasonic waveforms before and after subjecting the bolt to bending loads. The simulated preload characteristic was compared to the experimental characteristic. The two characteristics indicate some agreement.

Paper Details

Date Published: 11 June 2002
PDF: 12 pages
Proc. SPIE 4702, Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems, (11 June 2002); doi: 10.1117/12.469903
Show Author Affiliations
Ajay M. Koshti, Boeing Co. (United States)

Published in SPIE Proceedings Vol. 4702:
Smart Nondestructive Evaluation for Health Monitoring of Structural and Biological Systems
Tribikram Kundu, Editor(s)

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