A generalized machine learning framework to estimate fatigue life across materials with minimal data
Dharun Vadugappatty Srinivasan, Morteza Moradi, Panagiotis Komninos, Dimitrios Zarouchas, Anastasios P. Vassilopoulos
Abstract
• XGBoost trained with minimal data evaluates fatigue life based on void features. • Anti-data-leakage and anti-overfitting strategies are implemented. • One-hot encoding enables evaluating fatigue life across materials. • Void feature importance ranking: size ( S ) > location ( L ) > aspect ratio ( AR ). • A machine learning-aided S-N curve is proposed. In this research, a generalized machine learning (ML) framework is proposed to estimate the fatigue life of epoxy polymers and additively manufactured AlSi10Mg alloy materials, leveraging their failure surface void characteristics. An extreme gradient boosting algorithm-based ML framework encompassing Synthetic Minority Over-sampling TEchnique (SMOTE), categorical data encoding, and external loop cross-validation is developed to evaluate the fatigue life across materials. The influence of different training strategies based on materials, input features, encoding method, and data standardization on the model performance is explored. Additionally, the importance of anti-data-leakage and anti-overfitting measures over the ML model performance is addressed. The result shows that the data-leakage-free, external loop cross-validated model can estimate the fatigue life of selective epoxy polymers and metal alloys with an average R 2 of 0.71 ± 0.06 using a mere 12 to 27 experimental data points per material category. Whereas the model trained with data-leakage and overfitting results in high R 2 of 0.9.