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

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:168

Article

Rocha, I. B. C. M.^1,2  van der Meer, F. P.²  Raijmaekers, S.¹  Lahuerta, E.¹  Nijssen, R. P. L.¹  Sluys, L. J.² 

[1] Knowledge Ctr WMC, Kluisgat 5, NL-1771 MV Wieringerwerf, Netherlands

[2] Delft Univ Technol, Fac Civil Engn & Geosci, POB 5048, NL-2600 GA Delft, Netherlands

关键词: Viscoelasticity;    Viscoplasticity;    Fracture;    Plasticization;    Epoxy;   

DOI  :  10.1016/j.ijsolstr.2019.03.018

来源: Elsevier

【 摘 要 】

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. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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