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Technical Briefs

Torque-Angle Formulation of Threaded Fastener Tightening

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

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

J. Mech. Des 130(2), 024501 (Dec 27, 2007) (4 pages) doi:10.1115/1.2821388 History: Received June 27, 2006; Revised March 22, 2007; Published December 27, 2007

In this paper, the evolution equations of the bearing and thread friction coefficients are proposed based on mechanical behavior of the bolted joint assembly. The study shows excellent correlation between the proposed model and the experimental results for the breakaway torque values in both the tightening and loosening directions. Evaluation of the torque-angle control of the tightening process is made, and a modified torque-angle control approach is proposed. The effect of friction coefficients on the error in the clamping force prediction is analyzed.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Comparison between the experimental and predicted F‐θ curves under breakaway tightening loading

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Figure 2

Comparison between the experimental and predicted Ttp‐T curves under breakaway loosening

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Figure 3

Comparison between the experimental and predicted F‐θ curves under breakaway loosening loading

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Figure 4

Relative errors of T-A control and M-T-A control versus nut factor

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Figure 5

Evolutions of the bearing and thread friction coefficients under different cycles

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Figure 6

Relative error in the M-T-A approach versus the nut Factor ratio ΔK∕K

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