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Power-law viscous materials for analogue experiments: New data on the rheology of highly-filled silicone polymers

Boutelier, D. , Schrank, Christoph, & Cruden, A. (2008) Power-law viscous materials for analogue experiments: New data on the rheology of highly-filled silicone polymers. Journal of Structural Geology, 30(3), pp. 341-353.

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Abstract

The selection of appropriate analogue materials is a central consideration in the design of realistic physical models. We investigate the rheology of highly-filled silicone polymers in order to find materials with a power-law strain-rate softening rheology suitable for modelling rock deformation by dislocation creep and report the rheological properties of the materials as functions of the filler content. The mixtures exhibit strain-rate softening behaviour but with increasing amounts of filler become strain-dependent. For the strain-independent viscous materials, flow laws are presented while for strain-dependent materials the relative importance of strain and strain rate softening/hardening is reported. If the stress or strain rate is above a threshold value some highly-filled silicone polymers may be considered linear visco-elastic (strain independent) and power-law strain-rate softening. The power-law exponent can be raised from 1 to ~3 by using mixtures of high-viscosity silicone and plasticine. However, the need for high shear strain rates to obtain the power-law rheology imposes some restrictions on the usage of such materials for geodynamic modelling. Two simple shear experiments are presented that use Newtonian and power-law strain-rate softening materials. The results demonstrate how materials with power-law rheology result in better strain localization in analogue experiments.

Impact and interest:

15 citations in Scopus
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14 citations in Web of Science®

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ID Code: 55180
Item Type: Journal Article
Keywords: Rheology, Analogue modelling, Power law creep, Strain localization
DOI: 10.1016/j.jsg.2007.10.009
ISSN: 0191-8141
Subjects: Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOLOGY (040300) > Structural Geology (040312)
Australian and New Zealand Standard Research Classification > EARTH SCIENCES (040000) > GEOPHYSICS (040400) > Geophysical Fluid Dynamics (040403)
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Past > Institutes > Institute for Sustainable Resources
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2007 Elsevier Ltd.
Deposited On: 29 Nov 2012 09:09
Last Modified: 07 Jun 2013 06:41

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