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RESEARCH PAPERS

Dynamic Loosening and Tightening of a Single-Bolt Assembly

[+] Author and Article Information
D. P. Hess, S. V. Sudhirkashyap

Department of Mechanical Engineering, University of South Florida, Tampa, FL 33620

J. Vib. Acoust 119(3), 311-316 (Jul 01, 1997) (6 pages) doi:10.1115/1.2889725 History: Received March 01, 1995; Revised September 01, 1995; Online February 26, 2008

Abstract

Previous analyses of threaded fasteners under vibration are based on static equilibrium conditions with supporting data limited to low frequency loading. Such analyses predict only a net loosening action. This paper presents a dynamic model of a single-bolt assembly with moderate pre-load subjected to axial harmonic vibration. Simulations with this model predict that threaded fasteners can, on the average, loosen or tighten in the presence of vibration; and that the applied vibration, as well as other system parameters, can be tuned so that either action occurs. Measurements from a single-bolt assembly apparatus are presented and compared with the simulations.

Copyright © 1997 by The American Society of Mechanical Engineers
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