Research and Modeling of Viscoelastic Behavior of Elastomeric Nanocomposites
| Autor: | V. V Shadrin, A. L Svistkov, V. D. Kislitsyn, K. A Mokhireva |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Materials science Nanocomposite Graphene Materials Science (miscellaneous) Computational Mechanics Carbon black Polymer Elastomer Viscoelasticity law.invention Condensed Matter::Materials Science chemistry Mechanics of Materials law Deformation (engineering) Composite material Softening |
| Zdroj: | PNRPU Mechanics Bulletin. :76-87 |
| ISSN: | 2226-1869 2224-9893 |
| DOI: | 10.15593/perm.mech/2021.2.08 |
| Popis: | The paper presents results of studying mechanical properties of polymer composites depending on types of filler particles (granular - carbon black, nanodiamonds; layered - graphene plates; fibrous - single-walled nanotubes). These nanofillers differ greatly from each other in their structure and geometry. A significant difference in behavior of nanocomposites was revealed even with little introduction of particles into the elastomer. The highest level of reinforcement of the matrix was obtained when single-wall nanotubes and detonation nanodiamonds were used as fillers. The viscoelastic properties and the Mullins softening effect [1-4] were investigated in experiments performed with material samples subjected to complex uniaxial cyclic deformation. In these experiments, the amplitude of deformations was changed step by step; and at each step a time delay was specified to complete rearrangement processes of the material structure. It was found that a pronounced softening effect after the first cycle of deformation and significant hysteresis losses occur in the material filled with single-walled nanotubes. These characteristics are insignificant for the rest of nanocomposites until elongation increases twofold. In accordance with the obtained results, a new version of the mathematical model to describe properties of the viscoelastic polymer materials was proposed. The constants of the constitutive relations were calculated for each material; the theoretical and experimental load curves were compared. As a result, the introduced model is able to describe the behavior of elastomeric nanocomposites with a high accuracy. Moreover, this model is relatively easy to use, suitable for a wide range of strain rates and stretch ratios and does not require the entire history of deformation as needed for integral models of viscoelasticity. |
| Databáze: | OpenAIRE |
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