lodeguns / fatigue

This is the repository of the journal paper: Neural networks for fatigue crack propagation predictions in real-time under uncertainty - Giannella et al.

Fatigue Repository

Neural networks for fatigue crack propagation predictions in real-time under uncertainty

V. Giannella , F. Bardozzo , A. Postiglione , R. Tagliaferri , R. Sepe and E. Armentani

Crack propagation analyses are fundamental for all mechanical structures for which safety must be guaranteed, e.g. as for the aviation and aerospace fields. The estimation of life for structures in presence of defects is a process inevitably affected by numerous and unavoidable uncertainty and variability sources, whose effects need to be quantified to avoid unexpected failures. In this work, residual fatigue life prediction models have been created through neural networks for the purpose of performing probabilistic life predictions of damaged structures in real-time and under stochastically varying input parameters. In detail, five different neural network architectures have been compared in terms of accuracy, computational runtimes and minimum number of samples needed for training, so to determine the ideal architecture with the strongest generalization power. The networks have been trained, validated and tested by using the fatigue life predictions computed by means of simulations developed with finite element and Monte Carlo methods. A real-world case study has been presented to show how the proposed approach can deliver accurate life predictions even when input data are uncertain and highly variable. Results demonstrated that the 'H1-L1' neural network has been the best model, achieving an accuracy (Mean Square Error) of 4.8e-7 on the test dataset, and the best and the most stable results when decreasing the amount of data., while using the lowest number of parameters, thus highlighting its potential applicability for structural health monitoring purposes.

This repository contains the manuscript mentioned at this [link] and associated code and data sets used for benchmarking our predictive methodology based on neural networks.

In this repository are provided the code and the data to train, test and validate our neural networks models. The code is developed in Python with Keras backend Tensorflow 2.10.

The model wrapper for the optimizators should be installed from this repository.

Should you need help running our code, please contact us.

If you use this code in your research work you must cite us.

How to cite this paper

@article{giannella2023neural,
  title={Neural networks for fatigue crack propagation predictions in real-time under uncertainty},
  author={Giannella, Venanzio and Bardozzo, Francesco and Postiglione, Alberto and Tagliaferri, Roberto and Sepe, Raffaele and Armentani, Enrico},
  journal={Computers \& Structures},
  volume={288},
  pages={107157},
  year={2023},
  publisher={Elsevier}
}

Licence The same of the Journal Computers & Structures

**Corresponding author: ** vgiannella at unisa dot it

This work is supported by the Departements of Industrial Engineering and DISA-MIS - NeuRoNe Lab of the University of Salerno - Via Giovanni Paolo II, 132, Fisciano (SA), Italy