Manipal Journal of Science and Technology


Bolted joint is most widely used in assembling parts and joining various sections. In simulations, which include large models like jet engines, gas turbines, aviation structures, etc., where bolted joints are used in large numbers, modelling the threads for bolts and holes is computational expensive. To reduce the associated complexities of modelling actual threads, alternative models of representation are used. A bolted joint is influenced by different combinations of forces depending on the model and its function. Stress concentration factor of threaded hole for various load cases using static structural analysis in ANSYS is studied. Simplified modelling techniques are simulated for similar load cases and different stress components are extracted. For these techniques, transfer functions for stress components are evaluated and tabulated using actual threaded model evaluation. These functions are found at different circumferential regions of the hole and until sufficient depth to find the stress at the thread root. This analysis and tabulation of transfer functions is also verified for various bolt sizes under similar boundary conditions. Using the theory of superposition, transfer functions for various load cases can be applied to a simpler model and stress for any complicated loads in the threaded region can be evaluated.

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