Deep learning predicts path-dependent plasticity

M. Mozaffar, R. Bostanabad, W. Chen, K. Ehmann, J. Cao, M. A. Bessa

    Research output: Contribution to journalArticleScientificpeer-review

    74 Citations (Scopus)
    74 Downloads (Pure)

    Abstract

    Plasticity theory aims at describing the yield loci and work hardening of a material under general deformation states. Most of its complexity arises from the nontrivial dependence of the yield loci on the complete strain history of a material and its microstructure. This motivated 3 ingenious simplifications that underpinned a century of developments in this field: 1) yield criteria describing yield loci location; 2) associative or nonassociative flow rules defining the direction of plastic flow; and 3) effective stress-strain laws consistent with the plastic work equivalence principle. However, 2 key complications arise from these simplifications. First, finding equations that describe these 3 assumptions for materials with complex microstructures is not trivial. Second, yield surface evolution needs to be traced iteratively, i.e., through a return mapping algorithm. Here, we show that these assumptions are not needed in the context of sequence learning when using recurrent neural networks, diverting the above-mentioned complications. This work offers an alternative to currently established plasticity formulations by providing the foundations for finding history- and microstructure-dependent constitutive models through deep learning.

    Original languageEnglish
    Pages (from-to)26414-26420
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume116
    Issue number52
    DOIs
    Publication statusPublished - 2019

    Keywords

    • Data-driven modeling
    • Deep learning
    • Plasticity
    • Recurrent neural network

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