Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 88, Issue -, Pages 150-168Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2015.09.006
Keywords
Cosserat elasticity; Strain localization; Folding; Faulting; Anisotropy
Funding
- ERC advanced grant 'Instabilities and nonlocal multiscale modelling of materials' FP7-PEOPLE-IDEAS-ERC-AdG
Ask authors/readers for more resources
Materials with extreme mechanical anisotropy are designed to work near a material instability threshold where they display stress channeling and strain localization, effects that can be exploited in several technologies. Extreme couple stress solids are introduced and for the first time systematically analyzed in terms of several material instability criteria: positive-definiteness of the strain energy (implying uniqueness of the mixed b.v.p.), strong ellipticity (implying uniqueness of the b.v.p. with prescribed kinematics on the whole boundary), plane wave propagation, ellipticity, and the emergence of discontinuity surfaces. Several new and unexpected features are highlighted: (i) Ellipticity is mainly dictated by the 'Cosserat part' of the elasticity; (ii) its failure is shown to be related to the emergence of discontinuity surfaces; and (iii) ellipticity and wave propagation are not interdependent conditions (so that it is possible for waves not to propagate when the material is still in the elliptic range and, in very special cases, for waves to propagate when ellipticity does not hold). The proof that loss of ellipticity induces stress channeling, folding and faulting of an elastic Cosserat continuum (and the related derivation of the infinite-body Green's function under antiplane strain conditions) is deferred to Part II of this study. (C) 2015 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available