Data-driven hyperelasticity, Part I: A canonical isotropic formulation for rubberlike materials

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Hüsnü Dal - , Middle East Technical University (Author)
  • Funda Aksu Denli - , TUD Dresden University of Technology (Author)
  • Alp Kağan Açan - , Middle East Technical University (Author)
  • Michael Kaliske - , Chair of Structural Analysis (Author)

Abstract

Data-driven hyperelasticity shows great promise for modeling the mechanical response of rubberlike materials. It enables an automated linkage between experimental data and mechanical response without a priori knowledge of specific analytical expression for the strain energy density function or the stress expression. In this study, we propose a new data-driven approach with three distinct kinematic approaches; (i) invariant-based formulation, (ii) modified invariant-based approach, and (iii) principal stretch-based formulation to model the hyperelastic response of rubberlike materials. Within this context, we replace the partial derivatives of the strain energy density functions with appropriate B-spline interpolations, using a set of control points to implement various multiaxial loading scenarios, such as uniaxial tension, pure shear, and equibiaxial tension deformations. To ensure a polyconvex and stable constitutive response, we enforce the polyconvexity requirement into the B-spline interpolation along with appropriate normalization conditions. In order to obtain the control points of the B-splines, we train the proposed data-driven approach with respect to the Treloar and Kawabata datasets. On the numerical side, the stress and moduli expressions are derived for the finite element implementation. The predictive capabilities of the proposed approach are demonstrated through representative boundary value problems.

Details

Original languageEnglish
Article number105381
JournalJournal of the Mechanics and Physics of Solids
Volume179
Publication statusPublished - 1 Oct 2023
Peer-reviewedYes

External IDs

Scopus 85166323427

Keywords

Library keywords