Hierarchical Nonlinear Analysis of Creep-Recovery Behavior of Glass/Epoxy Hybrid Nanocomposite Reinforced by Silica Nanoparticles

Author

Assoc. Prof., Civil, Water and Environmental Eng., Shahid Beheshti Univ., Tehran, Iran.

10.22044/jsfm.2025.15960.3952

Abstract

In this paper, a hierarchical micromechanics-based analytical method is presented to predict the nonlinear viscoelastic behavior of polymer-based hybrid composites. The hybrid composite consists of glass and epoxy reinforced with silica nanoparticles. A unit cell-based micromechanical model is applied in two steps to extract the overall creep-recovery strain response of silica/epoxy nanocomposite and silica/glass/epoxy hybrid nanocomposite. The representative volume element consists of three phases: matrix, interphase, and reinforcement, with nonlinear viscoelastic, nonlinear viscoelastic or linear elastic, and linear elastic behavior, respectively. The Shapery nonlinear viscoelastic constitutive model is used. The interphase characteristics, including thickness and the behavioral model, dependent on the size, properties, and volume fraction of the nanoparticle, are considered. The results of the proposed method are compared with experimental results for validation. Also, a sensitivity analysis is performed by changing the number of sub-cells. The effects of the model parameters such as fiber and nanoreinforcement volume fraction, nanoreinforcement size, the interphase thickness and properties, and type of behavior, the applied loading level, and ambient temperature on the effective elastic and viscoelastic behavior, overall creep strain history, and overall creep-recovery response of the hybrid nanocomposite are investigated.

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