Work

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

Year: 2025

Type: article

Abstract: 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.

Source: International Journal of Fatigue

DOI: 10.1016/j.ijfatigue.2025.109459

Authors: Marten Beiler, Niklas Michael Bauer, Jörg Baumgartner, Moritz Braun

Institutions: Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), Fraunhofer Institute for Structural Durability and System Reliability, Hamburg University of Technology

Language: English

Topic: Fatigue and fracture mechanics

Subfield: Mechanics of Materials

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,940

Funder: Bundesministerium für Wirtschaft und Energie