Multi-Objective Optimization of Stress Concentration Factors for Fatigue Design of Internal Ring-Reinforced KT-Joints Undergoing Brace Axial Compression

Adnan Rasul; Saravanan Karuppanan; Veeradasan Perumal; Mark Ovinis; Mohsin Iqbal

doi:10.28991/CEJ-2024-010-06-03

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Adnan Rasul
adnan_22006634@utp.edu.my
Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610,, Malaysia http://orcid.org/0000-0002-9353-7282
Saravanan Karuppanan Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610,, Malaysia
Veeradasan Perumal Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610,, Malaysia
Mark Ovinis School of Engineering and the Built Environment, Birmingham City University, Birmingham,, United Kingdom
Mohsin Iqbal Department of Mechanical Engineering, Universiti Teknologi PETRONAS, Seri Iskandar 32610,, Malaysia

Vol. 10 No. 6 (2024): June

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Stress concentration factors are important to determine fatigue life based on the S-N curve methodology, where the lower the stress concentration factor, the higher the fatigue life. In this work, we developed internal ring-reinforced KT-joints, one of the most commonly used joints in the offshore industry, for the most practical ranges with the least stress concentration factors, followed by the formulation of a novel set of parametric equations for determining the stress concentration factors of internal ring-reinforced KT-joints. Using numerical investigation based on a finite element model and a response surface approach with 8 parameters (Î», Î´, Ïˆ, Î¶, Î¸, Ï„, Î³, and β) as input and eleven outputs (SCF 0° to SCF 90° and peak SCF), the stress at ten locations around the brace was evaluated, since efficient response surface methodology has been proven to give comprehensive and accurate predictions. The KT-joint with the following parameters: Î»=0.951515, Î´=0.2, Ïˆ=0.8, Î¶=0.31, Î¸=45.15°, Ï„=0.60, Î³=16.25, and β=0.40 had the least stress concentration factor. The KT-joint with the optimized parameters was validated through finite element analysis. The resulting percentage difference was less than 6%, indicating the applicability of the response surface methodology with high accuracy.

Doi: 10.28991/CEJ-2024-010-06-03

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Rasul, A., Karuppanan, S., Perumal, V., Ovinis, M., & Iqbal, M. (2024). Multi-Objective Optimization of Stress Concentration Factors for Fatigue Design of Internal Ring-Reinforced KT-Joints Undergoing Brace Axial Compression. Civil Engineering Journal, 10(6), 1742–1764. https://doi.org/10.28991/CEJ-2024-010-06-03

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Multi-Objective Optimization of Stress Concentration Factors for Fatigue Design of Internal Ring-Reinforced KT-Joints Undergoing Brace Axial Compression

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