[1] Zhang Hui, Zhang Zhisheng,. Phase transitions of dielectric elastomers in a circular frame [J]. Journal of Southeast University (English Edition), 2017, 33 (4): 387-390. [doi:10.3969/j.issn.1003-7985.2017.04.001]

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Phase transitions of dielectric elastomers in a circular frame()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

33

Issue:

2017 4

Page:

387-390

Research Field:

Mechanical Engineering

Publishing date:

2017-12-30

Info

Title:

Phase transitions of dielectric elastomers in a circular frame

Author(s):

Zhang Hui¹;  2;  Zhang Zhisheng¹

¹School of Mechanical Engineering, Southeast University, Nanjing 210096, China
²Department of Mechanical Engineering, National University of Singapore, Singapore 117576

Keywords:

phase transition;  dielectric elastomer;  wrinkle;  circular frame

PACS:

TH134

DOI:

10.3969/j.issn.1003-7985.2017.04.001

Abstract:

In order to imitate biological adhesion performance and skin properties, phase transitions on dielectric elastomers(DE)with high voltages are studied. The states of flat, wrinkled and bulging on the circular active area which is coated with electrodes verify the theoretical prediction of phase transitions and failure phenomena. When the DE membrane is subjected to a radial force and increasing voltage, four experimental phenomena are discovered before electric breakdown: The active region expands, and the thin membrane is still flat till breakdown; bulging forms instead of a flat area on the membrane; wrinkles and bulging coexist; and the active area is completely wrinkled. In the fourth state, there are two types of phase transitions between the flat and wrinkled regions in a membrane: Wrinkles form in small regions, and then propagate at the expense of the flat area until the entire active part becomes wrinkled; both the wrinkled and flat regions move interchangeably on a membrane with ramping voltage till breakdown. It is found that when there is no prestretch of a DE membrane, bulging will occur with the increasing voltage. Wrinkles commonly appear at large prestretch and, therefore, the prestretched ratio significantly affects electromechanical phase transitions.

References:

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Memo

Memo:

Biographies: Zhang Hui(1987—), female, graduate; Zhang Zhisheng(corresponding author), male, doctor, professor, oldbc@seu.edu.cn.
Foundation item: The National Natural Science Foundation of China No.51775108).
Citation: Zhang Hui, Zhang Zhisheng. Phase transitions of dielectric elastomers in a circular frame[J].Journal of Southeast University(English Edition), 2017, 33(4):387-390.DOI:10.3969/j.issn.1003-7985.2017.04.001.

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