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TECHNICAL PAPERS

Effect of Thread and Bearing Friction Coefficients on the Vibration-Induced Loosening of Threaded Fasteners

[+] Author and Article Information
Basil A. Housari

Department of Mechanical Engineering, Fastening and Joining Research Institute, Oakland University, Rochester, MI 48309

Sayed A. Nassar

Department of Mechanical Engineering, Fastening and Joining Research Institute, Oakland University, Rochester, MI 48309nassar@oakland.edu

J. Vib. Acoust 129(4), 484-494 (Apr 15, 2007) (11 pages) doi:10.1115/1.2748473 History: Received June 29, 2006; Revised April 15, 2007

This study provides a theoretical and experimental investigation of the effect of the thread and bearing friction coefficients on the self-loosening of threaded fasteners that are subjected to cyclic transverse loads. The friction coefficients are varied by using different types of coating and lubrication. A phosphate and oil coating and an olefin and molydisulfide solid film lubricant are used on the bolts tested. A mathematical model is developed to evaluate the self-loosening behavior in threaded fasteners when subjected to cyclic transverse loads. An experimental procedure and test setup are proposed in order to collect real-time data on the loosening rate (rate of clamp load loss per cycle) as well as the rotational angle of the bolt head during its gradual loosening. The experimental values of the friction coefficients are used in the mathematical model to monitor their effect on the theoretical results for the loosening rate. Experimentally, the friction coefficients are modified by changing the coating or the lubrication applied to the fasteners. The theoretical and experimental results are presented and discussed.

Copyright © 2007 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Bolt free body diagram

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Figure 2

Schematic of a typical bolted joint

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Figure 3

Forces on the bearing surface

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Figure 4

Thread contact force components

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Figure 5

Typical bolt tension-rotation curve

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Figure 6

Flow chart for the MATLAB algorithm

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Figure 7

Fastener torque components

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Figure 8

Effect of thread friction on self-loosening rate

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Figure 9

Effect of thread friction for various bearing friction coefficients on the loosening rate

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Figure 10

Effect of bearing friction for various thread friction coefficients on the loosening rate

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Figure 11

Effect of thread and bearing friction coefficients on the loosening rate

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Figure 12

Bearing friction coefficient and thread friction coefficient combinations

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Figure 13

Self-loosening test setup

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Figure 14

The fixture used in the experimental setup

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Figure 15

Experimental bearing and thread friction coefficients values for bolts with olefin molydisulfide solid film lubricant

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Figure 16

Experimental bearing and thread friction coefficients values for the phosphate and oil coated bolts

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Figure 17

Experimental and analytical loosening curves for the phosphate and oil coated bolts

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Figure 18

Experimental and analytical loosening curves for the olefin and molydisulfide solid film lubricated bolts

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