Machine learning of evolving physics-based material models for multiscale solid mechanics

I.B.C.M. Rocha*, P. Kerfriden, F.P. van der Meer

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

In this work we present a hybrid physics-based and data-driven learning approach to construct surrogate models for concurrent multiscale simulations of complex material behavior. We start from robust but inflexible physics-based constitutive models and increase their expressivity by allowing a subset of their material parameters to change in time according to an evolution operator learned from data. This leads to a flexible hybrid model combining a data-driven encoder and a physics-based decoder. Apart from introducing physics-motivated bias to the resulting surrogate, the internal variables of the decoder act as a memory mechanism that allows path dependency to arise naturally. We demonstrate the capabilities of the approach by combining an FNN encoder with several plasticity decoders and training the model to reproduce the macroscopic behavior of fiber-reinforced composites. The hybrid models are able to provide reasonable predictions of unloading/reloading behavior while being trained exclusively on monotonic data. Furthermore, in contrast to traditional surrogates mapping strains to stresses, the specific architecture of the hybrid model allows for lossless dimensionality reduction and straightforward enforcement of frame invariance by using strain invariants as the feature space of the encoder.

Original languageEnglish
Article number104707
Number of pages19
JournalMechanics of Materials
Volume184
DOIs
Publication statusPublished - 2023

Keywords

  • Concurrent multiscale (FE) modeling
  • Hybrid learning
  • Surrogate modeling

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