期刊
WAVE MOTION
卷 63, 期 -, 页码 120-134出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.wavemoti.2016.01.009
关键词
Strain gradient elasticity; Anisotropy; Higher-order tensors; Chirality; Acoustical activity; Wave propagation
资金
- Federation Francilienne de Mecanique
- Faculte de Sciences et Technologie of the Universite Paris-Est Creteil Val de Marne
In this paper anisotropic and dispersive wave propagation within linear strain-gradient elasticity is investigated. This analysis reveals significant features of this extended theory of continuum elasticity. First, and contrarily to classical elasticity, wave propagation in hexagonal (chiral or achiral) lattices becomes anisotropic as the frequency increases. Second, since strain-gradient elasticity is dispersive, group and energy velocities have to be treated as different quantities. These points are first theoretically derived, and then numerically experienced on hexagonal chiral and achiral lattices. The use of a continuum model for the description of the high frequency behavior of these microstructured materials can be of great interest in engineering applications, allowing problems with complex geometries to be more easily treated. (C) 2016 Elsevier B.V. All rights reserved.
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