Journal
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
Volume 377, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cma.2021.113695
Keywords
Sobolev training; Multiscale; Polycrystals; Isotropic yield function; Recurrent neural network; Physics-informed constraints
Funding
- NSF CAREER grant from Mechanics of Materials and Structures program at National Science Foundation, United States of America [CMMI-1846875, OAC-1940203]
- Dynamic Materials and Interactions Program from the Air Force Office of Scientific Research, United States of America [FA9550-17-1-0169, FA9550-19-1-0318]
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This study introduces a deep learning framework designed to train smoothed elastoplasticity models with interpretable components, and demonstrates that machine learning hardening laws can recover classical rules and discover new mechanisms, resulting in more robust and accurate forward predictions.
We introduce a deep learning framework designed to train smoothed elastoplasticity models with interpretable components, such as the stored elastic energy function, yield surface, and plastic flow that evolve based on a set of deep neural network predictions. By recasting the yield function as an evolving level set, we introduce a deep learning approach to deduce the solutions of the Hamilton-Jacobi equation that governs the hardening/softening mechanism. This machine learning hardening law may recover any classical hand-crafted hardening rules and discover new mechanisms that are either unbeknownst or difficult to express with mathematical expressions. Leveraging Sobolev training to gain control over the derivatives of the learned functions, the resultant machine learning elastoplasticity models are thermodynamically consistent, interpretable, while exhibiting excellent learning capacity. Using a 3D FFT solver to create a polycrystal database, numerical experiments are conducted and the implementations of each component of the models are individually verified. Our numerical experiments reveal that this new approach provides more robust and accurate forward predictions of cyclic stress paths than those obtained from black-box deep neural network models such as the recurrent neural network, the 1D convolutional neural network, and the multi-step feed-forward model. (C) 2021 Elsevier B.V. All rights reserved.
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