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Research Papers: Design and Analysis

Effect of Conical Angle and Thread Pitch on the Self-Loosening Performance of Preloaded Countersunk-Head Bolts

[+] Author and Article Information
Amro M. Zaki, Sayed A. Nassar, Xianjie Yang

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

J. Pressure Vessel Technol 134(2), 021210 (Jan 25, 2012) (8 pages) doi:10.1115/1.4005058 History: Received May 13, 2011; Revised August 15, 2011; Accepted August 17, 2011; Published January 25, 2012; Online January 25, 2012

This paper investigates the effect of the countersunk conical angle and thread pitch on the loosening performance of preloaded countersunk-head bolts that are subjected to harmonic transverse loading. A nonlinear mathematical model is used to predict the loosening performance. Cumulative differential loosening rotation of the bolt head is converted to a gradual loss in the bolt tension and joint clamp load. Model prediction of the self-loosening behavior is experimentally validated.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 5

Bearing friction torque Tb and bearing shear force Fbs versus the translational-to-rotational speed ratio ηb

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Figure 6

Thread friction torque Tt and thread shear force Fts versus the translational-to-rotational speed ratio ηt

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Figure 7

Bolt bending due to external transverse excitation

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Figure 8

Illustration of the cyclic torque components and shear force

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Figure 9

Sample self-loosening tests for coarse threads fasteners (82 deg conical angle)

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Figure 10

Self-loosening results for coarse threads fasteners (82 deg conical angle)

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Figure 11

Self-loosening results for fine threads fasteners (82 deg conical angle)

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Figure 12

Self-loosening results for coarse threads fasteners (100 deg conical angle)

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Figure 13

Effect of thread pitch p on the self-loosening behavior (82 deg conical angle)

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Figure 14

Effect of under head conical angle ϕ on the self-loosening behavior for fasteners tightened to initial preload of 17.5 kN

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Figure 15

Effect of under head conical angle ϕ on the frictional bearing torque component Tb

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Figure 4

Schematic of bolt head free body diagram and contact pressure distribution

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Figure 2

Velocity vector for an arbitrary point Q on the bolt under head

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Figure 3

Schematic of bolt head sliding and instantaneous center analysis

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