Shear banding with non-coaxial flow rule in viscous-plastic materials

Muhlhaus, Hans B., Olsen-Kettle, Louise, Shi, Jingyu and Moresi, Louis (2010). Shear banding with non-coaxial flow rule in viscous-plastic materials. In: Panos Papanastasiou, Euripides Papamichos, Antonios Zervos and Maria Stavropoulou, Proceedings of the 9th HSTAM International Congress on Mechanics: Vardoulakis mini-symposia. International Congress on Mechanics: Vardoulakis Mini-Symposia (9th, HSTAM, 2010), Limassol, Cyprus, (17-24). 12-14 July 2010.

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Name Description MIMEType Size Downloads
Author Muhlhaus, Hans B.
Olsen-Kettle, Louise
Shi, Jingyu
Moresi, Louis
Title of paper Shear banding with non-coaxial flow rule in viscous-plastic materials
Conference name International Congress on Mechanics: Vardoulakis Mini-Symposia (9th, HSTAM, 2010)
Conference location Limassol, Cyprus
Conference dates 12-14 July 2010
Convener Hellenic Society for Theoretical & Applied Mechanics (HSTAM)
Proceedings title Proceedings of the 9th HSTAM International Congress on Mechanics: Vardoulakis mini-symposia
Place of Publication Cyprus
Publisher Hellenic Society for Theoretical & Applied Mechanics (HSTAM)
Publication Year 2010
Sub-type Fully published paper
Open Access Status
Editor Panos Papanastasiou
Euripides Papamichos
Antonios Zervos
Maria Stavropoulou
Start page 17
End page 24
Total pages 8
Collection year 2012
Language eng
Formatted Abstract/Summary
The formation of shear bands for time and length scales appropriate for deformation processes in the upper Lithosphere is investigated in plane strain finite element simulations under predominantly uniaxial extension and compression respectively. The direction of gravity is assumed orthogonal to the extension/compression axis. Mathematically the formation of shear zones may be explained as a consequence of changes in the type of the governing model equations. Such changes or bifurcations depend strongly on the details of the constitutive relationships such as strain softening, thermal or chemical effects, associated or non-associated and coaxial or non-coaxial flow rules. Here we focus on strain softening and coaxial and non-coaxial flow rules. In the simulations we consider an initially rectangular domain with dimensions L0, H0 in the horizontal, vertical directions, respectively. The domain is extended or compressed by prescribing a uniform, horizontal velocity field along one of the vertical boundaries while keeping the opposite boundary fixed. An important global descriptor of the deformation process is the relationship between the horizontal stress resultant (average horizontal stress) and the strain In(L/L0), where L is the deformed length of the domain. The main goal is to investigate key factors influencing the phenomenology of the localization process such as flow rule, coaxial, non-coaxial and strain softening. Different origins of the mesh sensitivity of deformations involving localization are also investigated.
Keyword Shearing band
Non-coaxiality
Softening
Viscous plastic materials
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Plenary paper

Document type: Conference Paper
Collections: Non HERDC
Earth Systems Science Computational Centre Publications
 
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Created: Tue, 08 Mar 2011, 10:40:47 EST by Dr Jingyu Shi on behalf of Earth Systems Science Computational Centre