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Research Papers

Analytical and Experimental Investigation of Self-Loosening of Preloaded Cap Screw Fasteners

[+] Author and Article Information
Xianjie Yang

Department of Mechanical Engineering, Fastening and Joining Research Institute, Oakland University, Rochester, MI 48309yang2345@oakland.edu

Sayed Nassar

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

J. Vib. Acoust 133(3), 031007 (Mar 25, 2011) (8 pages) doi:10.1115/1.4003197 History: Received October 14, 2009; Revised March 08, 2010; Published March 25, 2011; Online March 25, 2011

In an effort to establish a theoretical outline of a criterion for preventing the vibration-induced loosening of preloaded threaded fasteners, this paper provides an experimental and analytical insight into the effect of the initial bolt preload and the excitation amplitude on the self-loosening performance of a cap screw fastener. A nonlinear model is used for predicting the clamp load loss caused by the vibration-induced loosening of cap screw fasteners under cyclic transverse loading. Experimental verification was conducted on the twisting torque variation and the effect of the preload level and transverse displacement amplitude. Comparison of the experimental and analytical results on the clamp load loss with the number of cycles verifies that the proposed model accurately predicts self-loosening performance.

Copyright © 2011 by American Society of Mechanical Engineers
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References

Figures

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Figure 3

The twisting torque variation of the strain gauged bolt under δ0=0.61 mm

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Figure 4

The bolt tension variation with number of cycles at 10 Hz for different preload levels under the cyclic transverse displacement amplitude of 0.3556 mm

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Figure 5

The bolt tension variation with number of cycles at 10 Hz for different preload levels under the cyclic transverse displacement amplitude of 0.61 mm

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Figure 6

The bolt tension variation with number of cycles time at 10 Hz for different preload levels under the cyclic transverse displacement amplitude of 0.70 mm

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Figure 7

Schematic diagram for bolt joint under transverse cyclic loading

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Figure 12

Schematic friction force distribution and its corresponding resultant transverse shear force ΔFts and moment ΔTt on a thread surface

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Figure 1

A schematic for the vibration loosening test machine (modified junker machine)

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Figure 2

The twisting torque variation of the strain gauged bolt under δ0=0.3556 mm

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Figure 8

Schematic diagram for the relationship of underhead bearing friction torque Tb, thread friction torque Tt, and pitch torque Tp

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Figure 9

Schematic diagram of friction force distribution and its corresponding resultant shear friction force and moment

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Figure 10

The ratio |Tb/μbqb0|(=RTb)−ηb and ratio |Fbs/μbqb0|(=RFb)−ηb response curves

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Figure 11

The f1b(ηb)/dηb−ηb and f3b(ηb)/dηb−ηb response curves

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Figure 13

The ratio |Tt/μtqt0|(=RTt)−ηt and ratio |Fts/μtqt0|(=RFt)−ηt response curves

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Figure 14

The df1t(ηt)/dηt−ηt and df3t(ηt)/dηt−ηt response curves

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Figure 15

The clamp load variation with the cyclic time at 10 Hz for three preloads of 4.6 kN, 7.1 kN, and 7.8 kN with δ0=0.3556 mm

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Figure 16

The clamp load variation with the cyclic time at 10 Hz for the preload of 8.6 kN, 10.5 kN, 12.5 kN, and 13.85 kN with δ0=0.61 mm

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Figure 17

The clamp load variation with the cyclic time at 10 Hz for the preload of 14 kN, 16 kN, and 19.6 kN with δ0=0.70 mm

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