Enhanced physics-informed neural networks for hyperelasticity

Diab W. Abueidda, Seid Koric, Erman Guleryuz, Nahil A. Sobh

Research output: Contribution to journalArticlepeer-review

Abstract

Physics-informed neural networks have gained growing interest. Specifically, they are used to solve partial differential equations governing several physical phenomena. However, physics-informed neural network models suffer from several issues and can fail to provide accurate solutions in many scenarios. We discuss a few of these challenges and the techniques, such as the use of Fourier transform, that can be used to resolve these issues. This paper proposes and develops a physics-informed neural network model that combines the residuals of the strong form and the potential energy, yielding many loss terms contributing to the definition of the loss function to be minimized. Hence, we propose using the coefficient of variation weighting scheme to dynamically and adaptively assign the weight for each loss term in the loss function. The developed PINN model is standalone and meshfree. In other words, it can accurately capture the mechanical response without requiring any labeled data. Although the framework can be used for many solid mechanics problems, we focus on three-dimensional (3D) hyperelasticity, where we consider two hyperelastic models. Once the model is trained, the response can be obtained almost instantly at any point in the physical domain, given its spatial coordinates. We demonstrate the framework's performance by solving different problems with various boundary conditions.

Original languageEnglish (US)
Pages (from-to)1585-1601
Number of pages17
JournalInternational Journal for Numerical Methods in Engineering
Volume124
Issue number7
DOIs
StatePublished - Apr 15 2023

Keywords

  • Fourier transform
  • computational mechanics
  • curriculum learning
  • meshfree method
  • multiloss weighting
  • partial differential equations

ASJC Scopus subject areas

  • Numerical Analysis
  • Engineering(all)
  • Applied Mathematics

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