Nonlinear behaviour of epoxy and epoxy-based nanocomposites: an integrated experimental and computational analysis

Mertol Tüfekci*, Tuğba Baytak, Osman Bulut, İnci Pir, Seren Acarer Arat, Burak Özkal, Haibao Liu, John P. Dear*, Loïc Salles

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The focus of this study is on the nonlinear mechanical properties of epoxy and epoxy-based nanocomposites, exploring frequency and strain amplitude dependency. Nanocomposite samples of epoxy are reinforced with fumed silica (FS), halloysite nanotubes (HNT) and Albipox 1000 rubber (Evonik) nanoparticles. Considering these particles have different geometries and stiffnesses, they are expected to have significantly different influences on the mechanics of the resulting composite. To enhance the reliability of the results and to reveal the impact of nanofillers on the mechanics of the material more distinctly, the manufacturing process is designed to be the same for all the specimens within the same material groups to eliminate the effects of the manufacturing process. The comprehensive characterization process consists of Fourier-Transform InfraRed Spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and Dynamic Mechanical Analysis (DMA). The DMA tests are designed so that the material properties are measured depending on the vibration frequency and strain amplitude. Finally, the characterized nonlinear dynamic properties of these nanocomposites are used as the input material properties into a numerical model. In this simulation, a cantilever beam with representative nonlinear material properties, for these nanocomposites, is created, as example and its forced response is plotted under the same levels of excitation in the frequency domain. Key effects of the different nanofillers are identified using the resonance behavior, primarily focusing on the stiffness and damping of the epoxy-based nanocomposites. These experimental and numerical procedures followed show the significant impact of the nanoparticle reinforcements on the nonlinear nature of these epoxy-based composites.

Original languageEnglish
JournalMechanics Based Design of Structures and Machines
DOIs
Publication statusAccepted/In press - 2023

Bibliographical note

Publisher Copyright:
© 2024 The Author(s). Published with license by Taylor & Francis Group, LLC.

Funding

Mertol Tüfekci would like to acknowledge the support of Scientific and Technological Research Council of Turkey (TUBITAK) (fund BİDEB 2213 2016/2) that makes this research possible. The authors also would like to thank Evonik for the courtesy of providing materials and Dr.Dr.-Ing. Stephan Sprenger for his helpful guidance. The authors would like to express gratitude to Dr. Ruth Brooker for her invaluable and helpful guidance on experimental procedures and insightful advice throughout the research process. The authors would also like to acknowledge computational resources and support provided by the Imperial College Research Computing Service ( http://doi.org/10.14469/hpc/2232 ).

FundersFunder number
Türkiye Bilimsel ve Teknolojik Araştırma KurumuBİDEB 2213 2016/2

    Keywords

    • Nanocomposites
    • characterization
    • frequency and amplitude dependence
    • nonlinear materials
    • stiffness and damping

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