Machine Learning Prediction on the Stress Intensity Factor for Multiple Edge Cracks in Coatings under Arbitrarily Varying Loads

This study utilizes machine learning (ML) methodology to estimate the stress intensity factor (SIF) for multiple edge cracks in a coating-substrate pair. The arbitrarily varying loading function is decomposed into a weighted sum of sine and cosine functions using Fourier series expansion, from which extracted are the characteristic period and harmonic number. A large data set derived from finite element calculation is used to train the ML model. By validation and comparison, it is found that the even extension method offers the highest accuracy in estimating the SIF. For three different loading functions, the predicted results show an average error of less than 1% compared to those by the finite element method. Additionally, the error of the predicted results is less than 3% in comparison with those in two thermal shock scenarios from existing literatures. The findings highlight the potential of ML-driven computational frameworks to achieve efficient and accurate evaluation of SIF for multiple cracks under realistic service conditions.