Instability of geomaterials caused by transitional negative stiffness

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A mechanism of instability of geomaterials in compression is proposed based on the phenomenon of transitional negative stiffness associated with the process of crack/fracture formation. This phenomenon acts only for a very short time as the fracture is being formed. The negative stiffness cracks increase the Poisson’s ratio and thus are capable of making nearly incompressible material elastically unstable. A geomaterial can reach the limiting value of the incremental Poisson’s ratio due to dilatancy observed in compression. While dilatancy is a non-linear phenomenon, incrementally, at the time of fracture formation it is elastic and hence can be made unstable by the transitional negative stiffness. © Springer International Publishing AG 2017.
Original languageEnglish
Title of host publicationBifurcation and Degradation of Geomaterials with Engineering Applications
EditorsEuripides Papamichos, Panos Papanastasiou, Elena Pasternak, Arcady Dyskin
Place of PublicationNetherlands
Number of pages6
ISBN (Electronic)9783319563978
ISBN (Print)9783319563961
Publication statusPublished - 2017
Event11th International Workshop on Bifurcation and Degradation in Geomaterials - Limassol, Cyprus
Duration: 21 May 201725 May 2017

Publication series

NameSpringer Series in Geomechanics and Geoengineering
ISSN (Print)1866-8755


Conference11th International Workshop on Bifurcation and Degradation in Geomaterials


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