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Effective Dynamic Constitutive Relations for 3-D Periodic Elastic Composites

Published online by Cambridge University Press:  10 April 2013

Ankit Srivastava and
Sia Nemat-Nasser
Ankit Srivastava
Affiliation:
Department of Mechanical and Aerospace Engineering University of California, San Diego La Jolla, CA, 92093-0416 USA
Sia Nemat-Nasser
Affiliation:
Department of Mechanical and Aerospace Engineering University of California, San Diego La Jolla, CA, 92093-0416 USA
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Abstract

Central to the idea of metamaterials is the concept of dynamic homogenization which seeks to define frequency dependent effective properties for Bloch wave propagation. Recent advances in the theory of dynamic homogenization have established the coupled form of the constitutive relation (Willis constitutive relation). This coupled form of the constitutive relation naturally emerges from ensemble averaging of the dynamic fields and automatically satisfies the dispersion relation in the case of periodic composites. Its importance is also notable due to its invariance under transformational acoustics. Here we discuss the explicit form of the effective dynamic constitutive equations. We elaborate upon the existence and emergence of coupling in the dynamic constitutive relation and further symmetries of the effective tensors.

Keywords

compositeacousticelastic properties

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References

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