Dynamic-Instability Parameters of Dielectric Elastomer Actuators with Equal Biaxial Prestress

AIAA Journal ◽  
2015 ◽  
Vol 53 (10) ◽  
pp. 3129-3133 ◽  
Author(s):  
M. M. Joglekar
Keyword(s):  
Dynamic Instability ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators

Instability in Nonlinear Oscillation of Dielectric Elastomers

2015 ◽  
Vol 82 (6) ◽  
Author(s):  
Jian Zhu
Keyword(s):  
Nonlinear Oscillation ◽  
Electromechanical Coupling ◽  
Haptic Feedback ◽  
Dynamic Instability ◽  
Dielectric Elastomer ◽  
Dielectric Elastomers ◽  
Critical Amplitude ◽  
Dielectric Elastomer Actuators ◽  
Coupling Dynamic ◽  
Static Instability

A membrane of a dielectric elastomer oscillates when subject to AC voltage. Its oscillation is nonlinear due to large deformation and nonlinear electromechanical coupling. Dynamic instability in dielectric elastomers—the oscillation with an unbounded amplitude—is investigated in this paper. The critical amplitude of AC voltage for dynamic instability varies with the frequency of AC voltage and reaches a valley when the superharmonic, harmonic, or subharmonic resonance is excited. Prestretches can improve dielectric elastomer actuators' capabilities to resist dynamic instability. The critical deformation at the onset of dynamic instability can be much larger than that at the onset of static instability. Oscillation of dielectric elastomers can be used for applications, such as vibration shakers for haptic feedback, soft loudspeakers, soft motors, and soft pumps. We hope that the current analyses can improve the understanding of dynamic behavior of dielectric elastomers and enhance their stability and reliability.

Dynamic instability of dielectric elastomer actuators subjected to unequal biaxial prestress

2017 ◽  
Vol 26 (11) ◽  
pp. 115019 ◽  
Author(s):  
Atul Kumar Sharma ◽  
S Bajpayee ◽  
D M Joglekar ◽  
M M Joglekar
Keyword(s):  
Dynamic Instability ◽  
Dielectric Elastomer ◽  
Dielectric Elastomer Actuators

An Energy-Based Approach to Extract the Dynamic Instability Parameters of Dielectric Elastomer Actuators

2014 ◽  
Vol 81 (9) ◽  
Author(s):  
M. M. Joglekar
Keyword(s):  
Electric Field ◽  
Dynamic Instability ◽  
Time History ◽  
Material Model ◽  
Dielectric Elastomer ◽  
Step Voltage ◽  
Dielectric Elastomer Actuators ◽  
Time History Response ◽  
Maximum Stretch ◽  
Static Instability

An energy-based approach is presented to extract the thresholds on the transient dynamic response of step voltage driven dielectric elastomer actuators (DEAs). The proposed approach relies on establishing the energy balance at the point of maximum stretch in an oscillation cycle followed by the application of an instability condition to extract the dynamic instability parameters. Explicit expressions are developed for the critical values of maximum stretch and the corresponding nominal electric field, thus circumventing the need to perform iterative time-integrations of the equation of motion. The underlying principles of the approach are enunciated for the neo-Hookean material model and further extended to analyze relatively complex multiparameter hyperelastic models (Mooney–Rivlin and Ogden) that are employed prevalently for investigating the behavior of DEAs. The dynamic instability parameters predicted using the energy method are validated by examining the time-history response of the actuator in the vicinity of the dynamic instability. The development of dynamic instability parameters is complemented by energy-based extraction of static instability parameters to facilitate a quick comparison between the two. It is inferred quantitatively that the nominal electric field sufficient to cause the dynamic instability and the corresponding thickness stretch is lower than those corresponding to the static instability. A set of representative case studies for multiparameter material models is presented at the end, which can be used as an input for further experimental corroboration. The results of the present investigation can find their potential use in the design of DEAs subjected to transient loading.

High Breakdown Field Dielectric Elastomer Actuators Using Encapsulated Polyaniline as High Dielectric Constant Filler

2010 ◽  
Vol 20 (19) ◽  
pp. 3280-3291 ◽  
Author(s):  
Martin Molberg ◽  
Daniel Crespy ◽  
Patrick Rupper ◽  
Frank Nüesch ◽  
Jan-Anders E. Månson ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
High Dielectric Constant ◽  
Dielectric Elastomer ◽  
Breakdown Field ◽  
Dielectric Elastomer Actuators ◽  
High Dielectric
Sign in / Sign up

Export Citation Format

Share Document