scholarly journals Analytical solution based on spatial distortion for a time-harmonic Green's function in a transverse isotropic viscoelastic solid

2021 ◽  
Vol 149 (4) ◽  
pp. 2283-2291
Author(s):  
Thomas J. Royston
Keyword(s):  
Analytical Solution ◽  
Green’S Function ◽  
Green's Function ◽  
Viscoelastic Solid ◽  
Spatial Distortion ◽  
Time Harmonic ◽  
Transverse Isotropic

scholarly journals The dynamics of folding instability in a constrained Cosserat medium

2017 ◽  
Vol 375 (2093) ◽  
pp. 20160159 ◽  
Author(s):  
Panos A. Gourgiotis ◽  
Davide Bigoni
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Three Dimensional ◽  
Deformation Pattern ◽  
Infinite Body ◽  
Generalized Continua ◽  
Cosserat Medium ◽  
Time Harmonic ◽  
Propagating Waves ◽  
Cosserat Continua

Different from Cauchy elastic materials, generalized continua, and in particular constrained Cosserat materials, can be designed to possess extreme (near a failure of ellipticity) orthotropy properties and in this way to model folding in a three-dimensional solid. Following this approach, folding, which is a narrow zone of highly localized bending, spontaneously emerges as a deformation pattern occurring in a strongly anisotropic solid. How this peculiar pattern interacts with wave propagation in the time-harmonic domain is revealed through the derivation of an antiplane, infinite-body Green’s function, which opens the way to integral techniques for anisotropic constrained Cosserat continua. Viewed as a perturbing agent, the Green’s function shows that folding, emerging near a steadily pulsating source in the limit of failure of ellipticity, is transformed into a disturbance with wavefronts parallel to the folding itself. The results of the presented study introduce the possibility of exploiting constrained Cosserat solids for propagating waves in materials displaying origami patterns of deformation. This article is part of the themed issue ‘Patterning through instabilities in complex media: theory and applications.’

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