An artificial neural network model for determining stress concentration factors for fatigue design of tubular T-joint under compressive loads

Rasul, Adnan and Karuppanan, Saravanan and Perumal, Veeradasan and Ovinis, Mark and Iqbal, Mohsin (2024) An artificial neural network model for determining stress concentration factors for fatigue design of tubular T-joint under compressive loads. International Journal of Structural Integrity. ISSN 1757-9864

An_artificial_neural_network_model_for_determining_stress_concentration_factors_for_fatigue_design_of_tubular_T-joint_under_compressive_loads.pdf - Accepted Version
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The stress concentration factor (SCF) is commonly utilized to assess the fatigue life of a tubular T-joint in offshore structures. Parametric equations derived from experimental testing and finite element analysis (FEA) are utilized to estimate the SCF efficiently. The mathematical equations provide the SCF at the crown and saddle of tubular T-joints for various load scenarios. Offshore structures are subjected to a wide range of stresses from all directions, and the hotspot stress might occur anywhere along the brace. It is critical to incorporate stress distribution since using the single-point SCF equation can lead to inaccurate hotspot stress and fatigue life estimates. As far as we know, there are no equations available to determine the SCF around the axis of the brace.

A mathematical model based on the training weights and biases of artificial neural networks (ANNs) is presented to predict SCF. 625 FEA simulations were conducted to obtain SCF data to train the ANN.

Using real data, this ANN was used to create mathematical formulas for determining the SCF. The equations can calculate the SCF with a percentage error of less than 6%.

Practical implications
Engineers in practice can use the equations to compute the hotspot stress precisely and rapidly, thereby minimizing risks linked to fatigue failure of offshore structures and assuring their longevity and reliability. Our research contributes to enhancing the safety and reliability of offshore structures by facilitating more precise assessments of stress distribution.

Precisely determining the SCF for the fatigue life of offshore structures reduces the potential hazards associated with fatigue failure, thereby guaranteeing their longevity and reliability. The present study offers a systematic approach for using FEA and ANN to calculate the stress distribution along the weld toe and the SCF in T-joints since ANNs are better at approximating complex phenomena than standard data fitting techniques. Once a database of parametric equations is available, it can be used to rapidly approximate the SCF, unlike experimentation, which is costly and FEA, which is time consuming.

Item Type: Article
Identification Number:
1 May 2024Accepted
10 May 2024Published Online
Uncontrolled Keywords: Artificial neural network, stress concentration factor, fatigue design, finite element analysis, T-joint
Subjects: CAH10 - engineering and technology > CAH10-01 - engineering > CAH10-01-02 - mechanical engineering
Divisions: Faculty of Computing, Engineering and the Built Environment > College of Engineering
Depositing User: Gemma Tonks
Date Deposited: 26 Jun 2024 12:45
Last Modified: 26 Jun 2024 12:45

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