Miguel Gomes Simões Baptista, RicardoInfante, VirgíniaBorrego, L. F. P.Sérgio, Edmundo R.Neto, Diogo M.Antunes, F. V.2025-09-032025-09-032024-12Baptista, R., Infante, V., Borrego, L. F. P., Sérgio, E. R., Neto, D. M., & Antunes, F. V. (2024). Interpolating CTS specimens' mode I and II stress intensity factors using artificial neural networks. Theorical and Applied Fracture Mechanics, 134, Part B, 1-16. https://doi.org/10.1016/j.tafmec.2024.1047610167-8442http://hdl.handle.net/10400.21/22101Fracture mechanics parameters, such as the stress intensity factor (SIF), are fundamental for the analysis of fracture, fatigue crack growth and crack paths. SIFs of a cracked body can be determined either experimentally or numerically. Analytical solutions of SIF are very useful, but their determination from discrete values can be extremely complex when there are many independent variables. In this paper, artificial neural networks (ANN) are proposed to predict mode I and II stress intensity factors in a CTS specimen under mixed mode loading conditions. Trained with numerical data, the performance of different network architectures and backpropagation algorithms was assessed. Using at least 10 neurons, in the hidden layers, made it possible for the designed solution to match the performance of analytical solutions. Increasing the number of neurons, allowed the model performance to improve up to 90%, when compared with previous analytical solutions. This increases the quality of fracture and fatigue studies done with the CTS sample.engCTS SpecimenMixed mode loadingStress intensity factorArtificial neural networksresearch articlehttps://doi.org/10.1016/j.tafmec.2024.1047611872-7638