Analytical and machine learning-based fatigue life prediction of welded joints under multiaxial loading

Evaluating the fatigue life of welded joints under multiaxial loading is a key challenge in structural engineering. This study explores machine learning (ML) methods for predicting fatigue life and compares their performance against the novel super ellipse criterion, which is an analytical approach that aims to improve current design standard methods (e.g., Eurocode 3, IIW). Using a dataset of uniaxial and multiaxial fatigue tests with varying phase angles, ML models—including artificial neural networks and extreme gradient boosting (XGBoost)—are trained on features like stress amplitudes, phase differences, and material properties. Artificial neural networks provide high accuracy, while tree-based models like XGBoost offer better interpretability via model agnostic interpretation using Explainable Artificial Intelligence. Results show ML models can outperform traditional criteria, especially under non-proportional loading, but face limitations near the edges of the training data. This work highlights the potential and challenges of ML in fatigue prediction and highlights their value for enhancing the safety and reliability of welded structures.

Subjects

Artificial neural network

Explainable AI

Extreme gradient boosting

Fatigue strength assessment

Multiaxial fatigue

SHAP analysis

DDC Class

620.11: Engineering Materials

006.32: Neural Networks

Lizenz

https://creativecommons.org/licenses/by/4.0/

Publication version

publishedVersion

Name

1-s2.0-S0142112325006565-main.pdf

Size

8.87 MB

Format

Adobe PDF

Options

Analytical and machine learning-based fatigue life prediction of welded joints under multiaxial loading