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Methodology for evaluating the tightening torque-clamping force relationship and friction coefficients in bolted joints

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Abstract

In bolted joints, clamping force is determined by the material, geometrical dimensions, and surface conditions of the assembly. There is a considerable risk of various industrial accidents if the clamping force is not evaluated accurately. Therefore, a method of determining tightening torque-clamping force relationship and friction coefficients in bolted joints was proposed by analyzing subdivided theoretical formulas of the input tightening torque. These formulas calculate the friction coefficients between the threads of the bolt and nut, and between the bolt underhead and contact area. A test device was also developed to measure the input tightening torque, clamping force, and thread friction torque. The torque-clamping force relationship and those friction coefficients for an assembly of the bolt, nut, and body parts in the vehicle chassis were obtained using the device. The accuracy of the derived results using the test device was verified by measuring the torque-clamping force relationship of the same assembly in the actual part. A highly reliable structure can be produced owing to the precise control of the clamping force according to the environmental conditions of the bolted joints.

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Acknowledgments

This work was supported by the Human Resources Development program (No. 20204030200110) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Trade, Industry and Energy.

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Authors and Affiliations

  1. School of Mechanical Engineering, Sungkyunkwan University, 2066, Seobu-ro, Jangan-Gu, Suwon-si, Gyeonggi-do, 16419, Korea

    Jongmin Lee, Damhyun Kim & Chang-Sung Seok

Authors
  1. Jongmin Lee
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  2. Damhyun Kim
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  3. Chang-Sung Seok
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Corresponding author

Correspondence to Chang-Sung Seok.

Additional information

Jongmin Lee is a Ph.D. candidate of the Department of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. His research interests include integrity evaluation of industrial structures with bolted joints.

Damhyun Kim is a Ph.D. in the Department of Mechanical Engineering, Sungkyunkwan University, Suwon, Korea. His research interests include thermal barrier coatings of gas turbine and structural integrity evaluation.

Chang-Sung Seok is currently a Professor in the School of Mechanical Engineering, Sungkyunkwan University, Suon, Korea. His research interest is structural integrity evaluation.

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Lee, J., Kim, D. & Seok, CS. Methodology for evaluating the tightening torque-clamping force relationship and friction coefficients in bolted joints. J Mech Sci Technol 36, 1913–1919 (2022). https://doi.org/10.1007/s12206-022-0328-y

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  • DOI: https://doi.org/10.1007/s12206-022-0328-y

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