Research Papers

Experimental Investigation of the Effects of Bolt Preload on the Dynamic Response of a Bolted Interface

[+] Author and Article Information
Charles Matthew Butner

Graduate Research Assistant,
Purdue Center for Systems Integrity,
1500 Kepner Road,
Lafayette, IN 47905
e-mail: charlesbutner@gmail.com

Douglas E. Adams

Kenninger Professor of Mechanical Engineering,
Purdue University,
Director, Center for Systems Integrity,
1500 Kepner Road, Lafayette, IN 47905
e-mail: deadams@purdue.edu

Jason R. Foley

Technical Area Lead, Hard Target Fuzing,
Fuzes Branch,
Air Force Research Lab, Munitions Directorate,
306 W. Eglin Boulevard, Building 432,
Eglin AFB, FL 32542-5430
e-mail: jason.foley@eglin.af.mil

Manuscript received September 8, 2011; final manuscript received April 26, 2012; accepted manuscript posted May 9, 2012; published online October 31, 2012. Assoc. Editor: John Lambros.

J. Appl. Mech 80(1), 011016 (Oct 31, 2012) (14 pages) Paper No: JAM-11-1327; doi: 10.1115/1.4006807 History: Received September 08, 2011; Revised April 26, 2012; Accepted May 09, 2012

Often in the study of bodies that undergo shock loading, it is desirable to measure the response of such structures with an instrumentation package. This instrumentation can be separated from the external housing by several preloaded interfaces. To better understand the effects of preload on the nonlinear dynamics introduced into the measurement, a simple preloaded interface test fixture was fabricated. Both low amplitude modal impact tests and high amplitude shock loading tests were used to analyze the effects of varying preload between the bodies on the linear and nonlinear dynamics observed in the response of the coupled bodies. The results of these measurements indicated that increases in preload reduced nonlinearity, but could amplify force transmission. Based on these results, a three degree of freedom system model was created to represent the dominant linear modes of response and the qualitative nonlinear characteristics that were observed in the high amplitude shock loading experiments.

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Fig. 1

Bolted interface test fixture

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Fig. 2

First six mode shapes found in experiment

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Fig. 3

MAC matrices for low and high preload tests for low and high impact amplitudes

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Fig. 4

Acceleration FRFs for various preload and impact amplitude levels

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Fig. 5

Test configuration for Hopkinson bar testing

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Fig. 6

Force history for load cell during large amplitude impact with various preloads

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Fig. 7

Acceleration response on two plates for various preloads

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Fig. 8

Frequency spectra from corresponding accelerometers on both plates for various preloads and 20 psi impacts below 2000 Hz

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Fig. 9

Accelerometer one frequency spectra for varying preload levels and impact amplitudes

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Fig. 10

Frequency spectra for corresponding accelerometer pairs for a 20 psi impact and 100 ft lb preload

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Fig. 11

Fixture mode of vibration at 2790 Hz

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Fig. 12

Three degree of freedom nonlinear system model

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Fig. 13

Comparison of FRFs derived from system equations and experiential data

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Fig. 14

Spring stiffness versus preload level for connecting springs

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Fig. 15

Cubic nonlinearity scale factor versus preload level

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Fig. 16

Model position FRFs for all preload levels and 2500 lbf impact

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Fig. 17

Comparison of hand-tight preload acceleration spectra from shock experiment and model simulation



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