The electro-mechanical phase transition of Gent model dielectric elastomer tube with two material constants

2013 ◽  
Author(s):  
Liwu Liu ◽  
Xiaojian Luo ◽  
Fan Fei ◽  
Yixing Wang ◽  
Jinsong Leng ◽  
...  
Keyword(s):  
Phase Transition ◽  
Dielectric Elastomer ◽  
Material Constants ◽  
Gent Model ◽  
Dielectric Elastomer Tube

A Note on the Unloading Behavior of Silicon Subjected to Nanoindentation

2009 ◽  
Vol 76-78 ◽  
pp. 398-403
Author(s):  
Li Chang ◽  
Liang Chi Zhang
Keyword(s):  
Mechanical Properties ◽  
Phase Transition ◽  
Phase Transformations ◽  
Elastic Response ◽  
Elastic Displacement ◽  
Power Relationship ◽  
Material Constants ◽  
Elastic Unloading

It is known that silicon, during nanoindentation unloading, undergoes various phase transformations beneath the indenter. Investigations into the details are however not available. This paper studies the unloading behavior of silicon subjected to cyclic nanoindentations. The results show that the elastic unloading behavior of the material can be described by a power relationship, P = α∙hm, where P is the load, h is the elastic displacement, and α and m are material constants. It was found that the values of α and m were almost independent of the phase transition events, indicating that the elastic response of the material is mostly governed by the mechanical properties of Si-I phase while the influence of the phase transformations is negligible.

Large deformation and electromechanical instability of a dielectric elastomer tube actuator

2010 ◽  
Vol 108 (7) ◽  
pp. 074113 ◽  
Author(s):  
Jian Zhu ◽  
Hristiyan Stoyanov ◽  
Guggi Kofod ◽  
Zhigang Suo
Keyword(s):  
Large Deformation ◽  
Dielectric Elastomer ◽  
Electromechanical Instability ◽  
Dielectric Elastomer Tube

Nonlinear Resonance Analysis of Dielectric Elastomer Actuators Under Thermal and Isothermal Conditions

2020 ◽  
Vol 12 (09) ◽  
pp. 2050100
Author(s):  
Amin Alibakhshi ◽  
Hamidreza Heidari
Keyword(s):  
Multiple Scales ◽  
Mechanical Load ◽  
Nonlinear Resonance ◽  
Thermal Conditions ◽  
Taylor Series Expansion ◽  
Dielectric Elastomer ◽  
Response Curves ◽  
Vibrational Response ◽  
Resonance Analysis ◽  
Gent Model

In this paper, nonlinear resonance characteristics of a dielectric elastomer actuator are investigated with special consideration on the thermal effects. A finite thermo-elasticity model based on the Gent model is constructed to analyze the vibrational response of the system. The equation of motion is derived via the Euler–Lagrange method. The multiple scales method and the Taylor series expansion are used to solve the governing equation. Nonlinear resonant responses of the system such softening/hardening and jump are explored. Furthermore, the influences of different system parameters including temperature, limiting stretch, damping, mechanical load, relative permittivity and voltage on the frequency response curves are explored. The results are compared with those obtained in the isothermal state, and those solved by numerical methods. It is found that both softening and hardening-type nonlinearities occur in the system in both non-thermal and thermal conditions.

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