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A solution algorithm for calculating the preload of T-type clamp bolts based on multiphysics coupling.
Yuening Yang1, Yuhang Ou2, Rui Lin3
1College of Electrical Engineering and New Energy, China Three Gorges University, Yichang, Hubei, China.
Plos One
|May 12, 2026
Summary
This study evaluates bolt preload in T-type clamps under live-working conditions. A multiphysics model accurately predicts preload, reducing errors by 11.41% compared to simpler methods.
Area of Science:
- Electrical Engineering
- Mechanical Engineering
- Physics
Background:
- Live-working in distribution networks involves current-carrying conductors.
- Electric, magnetic, and thermal fields affect conductor contact pressure and fitting bolt preload.
- Accurate bolt preload is crucial for the integrity of electrical connections.
Purpose of the Study:
- To evaluate bolt preload in T-type clamps under live-working conditions.
- To investigate the influence of current on bolt preload.
- To propose a multiphysics coupling approach for accurate preload determination.
Main Methods:
- Derivation of governing equations and boundary conditions based on elastic mechanics theory.
- Establishment of an iterative coupled electro-magneto-thermal multiphysics model.
- Finite element method (FEM) for solving preload equations.
Main Results:
- The proposed multiphysics model accurately determines bolt preload in T-type clamps.
- Experimental validation shows an average error of 5.82% compared to real-world data.
- The method reduces average error by 11.41% compared to approaches neglecting multiphysics coupling.
Conclusions:
- The developed multiphysics coupling approach provides accurate bolt preload evaluation for T-type clamps.
- This method is essential for ensuring reliability in distribution networks during live-working.
- The findings contribute to safer and more efficient electrical infrastructure maintenance.
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