Journal Article

Deep Neural Network-Based Inverse Identification of the Mechanical Behavior of Anisotropic Tubes

Ktari, Zied, Prates, Pedro, Khalfallah, Ali

2025

Overview

Tube hydroforming is a versatile forming process widely used in lightweight structural applications, where accurate characterization of the hoop mechanical behavior is crucial for reliable design and simulation. The ring hoop tensile test (RHTT) provides valuable experimental data for evaluating the elastoplastic response of anisotropic tubes in the hoop direction, but frictional effects often distort the measured force–displacement response. This study proposes a deep learning-based inverse identification framework to accurately recover the true hoop stress–strain behavior from RHTT data. Convolutional and recurrent neural network architectures, including CNN, long short term memory (LSTM), gated recurrent unit (GRU), bidirectional GRU (BiGRU), bidirectional LSTM (BiLSTM) and ConvLSTM, were trained using numerically generated datasets from finite element simulations. Data augmentation and hyperparameter tuning were applied to generalization. The hybrid ConvLSTM model achieved superior performance, with a minimum mean absolute error (MAE) of 0.08 and a coefficient of determination (R2) value of approximately 0.97, providing a close match to the Hill48 yield criterion. The proposed approach demonstrates the potential of deep neural networks as an efficient and accurate alternative to traditional inverse methods for characterizing anisotropic tubular materials.

• Publisher: MDPI AG
• Subject: AA6063-O aluminum tube / Accuracy / Aluminum alloys / Anisotropy / Artificial intelligence / Artificial neural networks / Composite materials / Data augmentation / Deep learning / deep learning networks / elastoplastic behavior / Elastoplasticity / Friction stir welding / hoop direction / Hoop stress / Hoops / Hydroforming / inverse parameter identification / Machine learning / Materials science / Mechanical properties / Metal forming / Neural networks / Recurrent neural networks / ring hoop tensile test (RHTT) / Simulation methods / Structural analysis / Tensile tests / Tubes / Yield criteria