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Corresponding Author

Fadi Alfaqs

Document Type

Article

Keywords

Laminated composite beam, Harmonic response, Finite element analysis, Artificial neural network, Interlaminar stress

Abstract

This study develops a mechanics-guided surrogate framework for the harmonic response of a simply supported, eight-ply Graphite/Epoxy beam. A shear-deformation formulation provides the physical interpretation, three-dimensional ANSYS models using SOLID186 elements supply the numerical responses, and feedforward neural networks approximate mid-span deflection, maximum axial normal stress and maximum interlaminar shear stress. The applied 1000 N load is evaluated through a 1–500 Hz excitation-frequency sweep; the forcing frequency is independent of the beam's natural frequencies. Each response dataset contains 1800 finite-element records covering 300 frequencies and six fibre orientations. Twenty L-BFGS bootstrap networks with two 10-neuron hidden layers were fitted per response using 1260 training, 270 validation and 270 testing samples. On the common held-out set, ensemble averaging produced R2 values of 0.956, 0.991 and 0.987 for deflection, normal stress and shear stress. Permutation results indicate that frequency governs the displacement mapping, whereas fibre orientation has the stronger influence on both stress responses. The empirical ensemble bands remain comparatively narrow over most of the sampled frequency interval. The workflow may therefore assist preliminary multi-response screening while retaining a mechanics-based basis for interpreting the learned relationships.

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