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Barcelona 05/2017

Modelling and Simulation of electromechanical coupling - application to piezoceramics and electro-elastic polymers

Andreas Menzel

Universitat Politecnica de Catalunya, Barcelona, Spain, 05.2017

 

 

Contents

Materials possessing electromechanical coupling phenomena are a prominent group within the class of smart materials. Such materials can transform electrical energy into mechanical energy and, possibly, vise versa. These properties make materials with electromechanical coupling phenomena very attractive for the design of smart devices, such as sensors and actuators. Two typical examples are piezoceramics, which undergo states of small deformation, and electro-active polymers, which may exhibit states of finite deformation.

 

 

Lectures

The first part of the lectures introduces the general modelling of electromechanical coupling phenomena from a continuum mechanics perspective. This includes in particular relevant balance relations. Special emphasis shall then be placed on the modelling of piezoceramics under states of small strains. Since such materials show hysteresis behaviour under sufficiently high levels of electromechanical loading, a set of suitable internal variables is introduced together with related evolution equations. The modelling framework is embedded into an electromechanically coupled finite element formulation in order to simulate representative boundary value problems under inhomogeneous states of deformation.

The second part of the lectures addresses the modelling of electro-active polymers under states of large strains. Even though such polymers in general show viscous response, the lecture shall restrict to the modelling of purely electro-elastic behaviour. On the one hand, different particularisations of a phenomenological framework are discussed, whereas a so-called micro-sphere model is elaborated on
the other. This micro-sphere framework may transform statistical physics based constitutive models to a macroscopic continuum framework. Both approaches are embedded into an electromechanically coupled finite element formulation.

The third part of the lectures focuses on the algorithmic implementation of finite deformation electro-elasticity under homogeneous states of deformation. The general framework can be interpreted as an iterative constitutive driver - including tangent operators similar to those required for finite element formulations. Special emphasis shall be placed on incompressibility, different phenomenological models, and a simple micro-sphere application.

 

 

Accompanying documents

Description

File

Contents

content.pdf

Piezoceramics

piezoceramics.pdf

Electro-active polymers

electroelasticity.pdf

Constitutive driver

constitutive_driver_notes.pdf

constitutive_driver.zip

 

 

General reading

R.W. Ogden and D.J. Steigmann (eds.). Mechanics and Electrodynamics of Magneto- and Electro-Elastic Materials. CISM Courses and Lectures, vol. 527, Sringer, 2011.

P.P. Silvester and R.L. Ferrari. Finite Elements for Electrical Engineers, Cambridge University Press, 1996.

R.C. Smith. Smart Material Systems - Model Development. SIAM, Frontiers in Applied Mathematics, 2005.

 

 

Related references

A. Menzel, A. Arockiarajan, and S.M. Sivakumar. Two models to simulate rate--dependent domain switching effects - application to ferroelastic polycrystalline ceramics. Smart Mater. Struct., 17:015026, 2008.

K. Jayabal, A. Menzel, A. Arockiarajan, and S.M. Srinivasan. Micromechanical modelling of switching phenomena in polycrystalline piezoceramics. Application of a polygonal finite element approach. Comput. Mech., 48:421-435, 2011.

S. Maniprakash, R. Jayendiran, A. Menzel, and A. Arockiarajan. Experimental investigation, modelling and simulation of rate-dependent response of 1-3 ferroelectric composites. Mech. Mat., 94:91-105, 2016.

A. Ask, A. Menzel, and M. Ristinmaa. Modelling of viscoelastic dielectric elastomers with deformation dependent electric properties. Proc. IUTAM, 12:134-144, 2015.

S. Thylander, A. Menzel, and M. Ristinmaa. An electromechanically coupled micro-sphere framework - application to the finite element analysis of electrostrictive polymers. Smart Mater. Struct., 21:094008, 2012. 22:039501, 2013.