Deformation activated negative group velocity state in soft laminates

We report the observation of deformation-induced negative group velocity (NGV) state in the non-periodic media. The phenomenon is illustrated by examples of the shear waves traveling along the non-periodic direction of pre-strained soft laminates. We show that the NGV state can be induced in absolut...

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Bibliographic Details
Published inExtreme Mechanics Letters Vol. 51; p. 101592
Main Authors Arora, Nitesh, Yao, Qi, Rudykh, Stephan
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.02.2022
Subjects
Group velocity
Instabilities
Metamaterial
Shear waves
Soft matter
Wave propagation
Soft matter
Shear waves
Wave propagation
Group velocity
Instabilities
Metamaterial
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Summary:We report the observation of deformation-induced negative group velocity (NGV) state in the non-periodic media. The phenomenon is illustrated by examples of the shear waves traveling along the non-periodic direction of pre-strained soft laminates. We show that the NGV state can be induced in absolutely stable laminates without invoking buckling. These stable composites with activated NGV states are achieved through tailored stiffening behavior of their non-Gaussian soft phases. The deformation range – for which the NGV state is activated – is multiple times higher in the proposed absolutely-stable composites than those prone to buckling. Finally, we analyze how this unusual NGV state can be induced and further tuned by variations in the material and geometric parameter spaces.
ISSN:2352-4316
2352-4316
DOI:10.1016/j.eml.2021.101592