Numerical/experimental study of the monotonic and cyclic viscoelastic/viscoplastic/fracture behavior of an epoxy resin

I. B.C.M. Rocha, F. P. van der Meer, S. Raijmaekers, F. Lahuerta, R. P.L. Nijssen, L. J. Sluys

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

This paper investigates the viscoelastic/viscoplastic/fracture behavior of an epoxy resin. A state-of-the-art pressure-dependent elastoplastic constitutive model (Melro et al. 2013) is expanded to include viscoelasticity, viscoplasticity and a modified damage formulation with linear softening and shrinking pressure-dependent fracture surface. A water plasticization model with a single degradation factor is proposed. A set of new quasi-static and fatigue experiments is used to calibrate the model and assess its predictive capabilities. The model correctly represents the rate dependent plasticity and fracture initiation behavior of the studied epoxy. The stiffness and strength degradations after plasticization are also accurately captured. The model is found to be less suitable in reproducing the measured loading-unloading behavior, which displayed strong nonlinearity in combination with limited permanent deformation. Nevertheless, reasonably accurate fatigue life predictions in the low-cycle regime are obtained.
Original languageEnglish
Pages (from-to)153-165
Number of pages13
JournalInternational Journal of Solids and Structures
Volume168
DOIs
Publication statusPublished - 2019

Keywords

  • Epoxy
  • Fracture
  • Plasticization
  • Viscoelasticity
  • Viscoplasticity

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