Finite bending of a dielectric elastomer actuator and pre-stretch effects
A sandwiched dielectric elastomer actuator consisting of a hyperelastic material layer and two pre-stretched dielectric elastomer layers is introduced in this work, which is bi-directionally bendable when subject to a direct current voltage on the top or bottom layer. By using the pure bending defor...
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| Published in | International journal of mechanical sciences Vol. 122; pp. 120 - 128 |
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| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
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Elsevier Ltd
01.03.2017
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| Abstract | A sandwiched dielectric elastomer actuator consisting of a hyperelastic material layer and two pre-stretched dielectric elastomer layers is introduced in this work, which is bi-directionally bendable when subject to a direct current voltage on the top or bottom layer. By using the pure bending deformation assumption and the nonlinear electroelasticity theory, the voltage-induced finite bending deformation of the actuator is studied theoretically with a focus on the pre-stretch effects. Although pure bending deformation may be not exactly ensured at the free end of the considered structure, according to the well known Saint Venant's principle, the boundary effect will not affect the deformation and stress distribution outside the boundary layers at the free end. Through theoretical modeling and numerical analyses, it is revealed that pre-stretch helps to reduce the drive voltage required to induce a desired bending deformation, and when the pre-stretch is comparatively large, there exists a pre-stretch dependent optimum thickness ratio so that the drive voltage is minimized. This work is expected to provide guide for the design and fabrication of high-performance soft actuators and soft robotics.
•A sandwiched dielectric elastomer actuator is studied.•A finite bending solution for voltage-induced bending deformation is presented.•Pre-stretch reduces the drive voltage required to induce a desired bending deformation.•For large enough pre-stretch, there exists an optimum thickness ratio to minimize the drive voltage. |
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| AbstractList | A sandwiched dielectric elastomer actuator consisting of a hyperelastic material layer and two pre-stretched dielectric elastomer layers is introduced in this work, which is bi-directionally bendable when subject to a direct current voltage on the top or bottom layer. By using the pure bending deformation assumption and the nonlinear electroelasticity theory, the voltage-induced finite bending deformation of the actuator is studied theoretically with a focus on the pre-stretch effects. Although pure bending deformation may be not exactly ensured at the free end of the considered structure, according to the well known Saint Venant's principle, the boundary effect will not affect the deformation and stress distribution outside the boundary layers at the free end. Through theoretical modeling and numerical analyses, it is revealed that pre-stretch helps to reduce the drive voltage required to induce a desired bending deformation, and when the pre-stretch is comparatively large, there exists a pre-stretch dependent optimum thickness ratio so that the drive voltage is minimized. This work is expected to provide guide for the design and fabrication of high-performance soft actuators and soft robotics.
•A sandwiched dielectric elastomer actuator is studied.•A finite bending solution for voltage-induced bending deformation is presented.•Pre-stretch reduces the drive voltage required to induce a desired bending deformation.•For large enough pre-stretch, there exists an optimum thickness ratio to minimize the drive voltage. |
| Author | He, Liwen Wang, Ji Lou, Jia Du, Jianke |
| Author_xml | – sequence: 1 givenname: Liwen surname: He fullname: He, Liwen email: physi_mechanism@163.com – sequence: 2 givenname: Jia surname: Lou fullname: Lou, Jia email: jiajia_smile@163.com – sequence: 3 givenname: Jianke surname: Du fullname: Du, Jianke – sequence: 4 givenname: Ji surname: Wang fullname: Wang, Ji |
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| SubjectTerms | Dielectric elastomers Finite bending Pre-stretch Soft actuators Soft materials |
| Title | Finite bending of a dielectric elastomer actuator and pre-stretch effects |
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