An energy-based model for both rate-dependent and rate-independent hysteretic effects in uniaxially-loaded dielectric elastomer actuators

Johannes Prechtl; Felix Scherf; Julian Kunze; Kathrin Flaßkamp; Gianluca Rizzello

doi:10.1117/12.2657685

28 April 2023 An energy-based model for both rate-dependent and rate-independent hysteretic effects in uniaxially-loaded dielectric elastomer actuators

Johannes Prechtl, Felix Scherf, Julian Kunze, Kathrin Flaßkamp, Gianluca Rizzello

Author Affiliations +

Proceedings Volume 12482, Electroactive Polymer Actuators and Devices (EAPAD) XXV; 124820Q (2023) https://doi.org/10.1117/12.2657685
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

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Abstract

It is widely known that dielectric elastomer (DE) material exhibits a strongly rate-dependent hysteresis in their stress-stretch response. It is experimentally observed, however, that the hysteresis of some DE materials (e.g., silicone) behaves as practically rate-independent when operating in the sub-Hz range. Despite this fact, the investigation and modeling of rate-independent hysteretic effects in DEs has received much less attention in the literature, compared to the rate-dependent ones. In this paper, we propose a new lumped-parameter dynamic model capable of describing a stress-stretch DE hysteresis with both rate-dependent and rate-independent effects. The model is grounded on a physics-based approach, combining classic thermodynamically-consistent modeling of DE large deformations and electro-mechanical coupling with a new energy-based Maxwell-Lion description of the hysteretic process. After presenting the theory, the model is validated by means of experiments conducted on silicone-based rolled DE actuators.

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Johannes Prechtl, Felix Scherf, Julian Kunze, Kathrin Flaßkamp, and Gianluca Rizzello "An energy-based model for both rate-dependent and rate-independent hysteretic effects in uniaxially-loaded dielectric elastomer actuators", Proc. SPIE 12482, Electroactive Polymer Actuators and Devices (EAPAD) XXV, 124820Q (28 April 2023); https://doi.org/10.1117/12.2657685

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