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.
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.
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|Item Type:||Journal Article|
|Keywords:||Rheology, Analogue modelling, Power law creep, Strain localization|
|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:||28 Nov 2012 23:09|
|Last Modified:||06 Jun 2013 20:41|
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