Viscoelastic Effects on the Response of Electroelastic Materials
| Autor: | Clara Burgos-Simón, Pedro Llovera-Segovia, Damián Ginestar, Ricardo Díaz-Calleja, Vicente Moreno, Alfredo Quijano, Joaquín Díaz-Boils, Juan Carlos Cortés |
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| Rok vydání: | 2021 |
| Předmět: |
WOS(2)
Materials science Polymers and Plastics Field (physics) fractional derivatives Thermodynamic equilibrium Organic chemistry 02 engineering and technology Dielectric 01 natural sciences Article Viscoelasticity Bifurcations QD241-441 0103 physical sciences Scopus viscoelasticity 010302 applied physics Relaxation (NMR) Fractional derivatives General Chemistry Mechanics electroelastic materials 021001 nanoscience & nanotechnology Fractional calculus Hyperelastic material MAQUINAS Y MOTORES TERMICOS Dissipative system INGENIERIA ELECTRICA 0210 nano-technology Electroelastic materials MATEMATICA APLICADA bifurcations |
| Zdroj: | Polymers, Vol 13, Iss 2198, p 2198 (2021) RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia instname Re-Unir. Archivo Institucional de la Universidad Internacional de La Rioja Polymers Volume 13 Issue 13 |
| ISSN: | 2073-4360 |
| Popis: | Electroelastic materials, as for example, 3M VHB 4910, are attracting attention as actuators or generators in some developments and applications. This is due to their capacity of being deformed when submitted to an electric field. Some models of their actuation are available, but recently, viscoelastic models have been proposed to give an account of the dissipative behaviour of these materials. Their response to an external mechanical or electrical force field implies a relaxation process towards a new state of thermodynamic equilibrium, which can be described by a relaxation time. However, it is well known that viscoelastic and dielectric materials, as for example, polymers, exhibit a distribution of relaxation times instead of a single relaxation time. In the present approach, a continuous distribution of relaxation times is proposed via the introduction of fractional derivatives of the stress and strain, which gives a better account of the material behaviour. The application of fractional derivatives is described and a comparison with former results is made. Then, a double generalisation is carried out: the first one is referred to the viscoelastic or dielectric models and is addressed to obtain a nonsymmetric spectrum of relaxation times, and the second one is the adoption of the more realistic Mooney–Rivlin equation for the stress–strain relationship of the elastomeric material. A modified Mooney–Rivlin model for the free energy density of a hyperelastic material, VHB 4910 has been used based on experimental results of previous authors. This last proposal ensures the appearance of the bifurcation phenomena which is analysed for equibiaxial dead loads time-dependent bifurcation phenomena are predicted by the extended Mooney–Rivlin equations. |
| Databáze: | OpenAIRE |
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