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Erschienen in: Archive of Applied Mechanics 5/2021

28.01.2021 | Original

Analytical solutions of the simple shear problem for micromorphic models and other generalized continua

verfasst von: Gianluca Rizzi, Geralf Hütter, Angela Madeo, Patrizio Neff

Erschienen in: Archive of Applied Mechanics | Ausgabe 5/2021

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Abstract

To draw conclusions as regards the stability and modelling limits of the investigated continuum, we consider a family of infinitesimal isotropic generalized continuum models (Mindlin–Eringen micromorphic, relaxed micromorphic continuum, Cosserat, micropolar, microstretch, microstrain, microvoid, indeterminate couple stress, second gradient elasticity, etc.) and solve analytically the simple shear problem of an infinite stripe. A qualitative measure characterizing the different generalized continuum moduli is given by the shear stiffness \(\mu ^{*}\). This stiffness is in general length-scale dependent. Interesting limit cases are highlighted, which allow to interpret some of the appearing material parameter of the investigated continua.

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Fußnoten
1
The following energy expression has been used in [41]: \(W \left( \varvec{\nabla u}, \varvec{P}, \varvec{\nabla P}\right) = \mu \left\Vert \hbox {sym} \, \varvec{\nabla u} \right\Vert ^2 + \lambda /2 \, \hbox {tr}^2 \left( \varvec{\nabla u} \right) + \alpha \, \mu \left\Vert \varvec{\nabla u} - \varvec{P} \right\Vert ^2 + \alpha \, \lambda /2 \, \hbox {tr}^2 \left( \varvec{\nabla u} - \varvec{P} \right) +\mu \, L_{c}^2/2 \, \left\Vert \varvec{\nabla P} \right\Vert ^2 \). This formulations is not reconcilable with the relaxed micromorphic model even if we neglect the curvature part.
 
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Metadaten
Titel
Analytical solutions of the simple shear problem for micromorphic models and other generalized continua
verfasst von
Gianluca Rizzi
Geralf Hütter
Angela Madeo
Patrizio Neff
Publikationsdatum
28.01.2021
Verlag
Springer Berlin Heidelberg
Erschienen in
Archive of Applied Mechanics / Ausgabe 5/2021
Print ISSN: 0939-1533
Elektronische ISSN: 1432-0681
DOI
https://doi.org/10.1007/s00419-021-01881-w

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