A constitutive model for elastic flexoelectric materials under small deformation based on second gradient continuum theory is developed, using a Toupin-like variational formulation to simultaneously obtain constitutive relations, balance equations and boundary conditions. The model includes three different electromechanical ‘‘stresses’’: a higher-order stress, an extended local electric force and a generalized Cauchy stress tensor. The constitutive equations of the model are obtained by postulating an internal energy density function which depends on both the strain and its gradient as well as the polarization. Finally, as an application of the model, we derive the explicit analytical expressions of the polarization and displacement vector fields for the problem of the polarization induced over a thin spherical shell subjected to hydrostatic loading conditions.

A model for elastic flexoelectric materials including strain gradient effects / Enakoutsa, Koffi; DELLA CORTE, Alessandro; Giorgio, Ivan. - In: MATHEMATICS AND MECHANICS OF SOLIDS. - ISSN 1081-2865. - STAMPA. - 21:2(2016), pp. 242-254. [10.1177/1081286515588638]

A model for elastic flexoelectric materials including strain gradient effects

DELLA CORTE, ALESSANDRO;GIORGIO, IVAN
2016

Abstract

A constitutive model for elastic flexoelectric materials under small deformation based on second gradient continuum theory is developed, using a Toupin-like variational formulation to simultaneously obtain constitutive relations, balance equations and boundary conditions. The model includes three different electromechanical ‘‘stresses’’: a higher-order stress, an extended local electric force and a generalized Cauchy stress tensor. The constitutive equations of the model are obtained by postulating an internal energy density function which depends on both the strain and its gradient as well as the polarization. Finally, as an application of the model, we derive the explicit analytical expressions of the polarization and displacement vector fields for the problem of the polarization induced over a thin spherical shell subjected to hydrostatic loading conditions.
2016
constitutive equations; electro-mechanical coupling; Flexoelectric materials; second gradient theory
01 Pubblicazione su rivista::01a Articolo in rivista
A model for elastic flexoelectric materials including strain gradient effects / Enakoutsa, Koffi; DELLA CORTE, Alessandro; Giorgio, Ivan. - In: MATHEMATICS AND MECHANICS OF SOLIDS. - ISSN 1081-2865. - STAMPA. - 21:2(2016), pp. 242-254. [10.1177/1081286515588638]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/907660
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