Computation of Member Stiffness in the Design of Bolted Joints

[+] Author and Article Information
Joseph C. Musto, Nicholas R. Konkle

Mechanical Engineering Department, Milwaukee School of Engineering, 1025 N. Broadway, Milwaukee, WI 53202-3109

J. Mech. Des 128(6), 1357-1360 (Dec 13, 2005) (4 pages) doi:10.1115/1.2338578 History: Received July 27, 2005; Revised December 13, 2005

In designing bolted connections in machinery applications, it is necessary to estimate the stiffness of the clamped members. The method of Wileman (Wileman, J., Choudhury, M., and Green, I., 1991, ASME J. of Mech. Des., 113, pp. 432–437) has become a standard approach to estimating the member stiffness. In this method, finite element studies are used to estimate the stiffness of the clamped members of a single material type. In this paper, the studies performed by Wileman (Wileman, J., Choudhury, M., and Green, I., 1991, ASME J. of Mech. Des., 113, pp. 432–437) are extended to include the case where the clamped members are of different material types. Results for a steel/aluminum joint are presented in detail, and a generalized technique for estimating the member stiffness for any material combination is derived. The method developed in this brief is shown to provide accurate estimates of member stiffness over a range of aspect ratios and joint compositions.

Copyright © 2006 by American Society of Mechanical Engineers
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Grahic Jump Location
Figure 1

Model used to calculate deflection under load

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Figure 2

Member stiffness as a function of percent aluminum in an aluminum/steel joint w∕d=15.9mm and l∕d=5∕12

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Figure 3

Nondimensional stiffness versus aspect ratio for various joint compositions



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