Ductile deformation of single inclusions in simple shear with a finite-strain hyperelastoviscoplastic rheology

Schrank, Christoph, Karrech, Ali, Boutelier, David A., & Regenauer-Lieb, Klaus (2016) Ductile deformation of single inclusions in simple shear with a finite-strain hyperelastoviscoplastic rheology. In Mukherjee, Soumyajit & Mulchrone, Kieran (Eds.) Ductile Shear Zones: From Micro- to Macro-Scales. John Wiley & Sons, Chichester, UK; Hoboken, NJ, pp. 46-58.

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We examine the 2D plane-­strain deformation of initially round, matrix-­bonded, deformable single inclusions in isothermal simple shear using a recently introduced hyperelastoviscoplastic rheology. The broad parameter space spanned by the wide range of effective viscosities, yield stresses, relaxation times, and strain rates encountered in the ductile lithosphere is explored systematically for weak and strong inclusions, the effective viscosity of which varies with respect to the matrix. Most inclusion studies to date focused on elastic or purely viscous rheologies. Comparing our results with linear-­viscous inclusions in a linear-­viscous matrix, we observe significantly different shape evolution of weak and strong inclusions over most of the relevant parameter space. The evolution of inclusion inclination relative to the shear plane is more strongly affected by elastic and plastic contributions to rheology in the case of strong inclusions. In addition, we found that strong inclusions deform in the transient viscoelastic stress regime at high Weissenberg numbers (≥0.01) up to bulk shear strains larger than 3. Studies using the shapes of deformed objects for finite-­strain analysis or viscosity-­ratio estimation should establish carefully which rheology and loading conditions reflect material and deformation properties. We suggest that relatively strong, deformable clasts in shear zones retain stored energy up to fairly high shear strains. Hence, purely viscous models of clast deformation may overlook an important contribution to the energy budget, which may drive dissipation processes within and around natural inclusions.

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ID Code: 95347
Item Type: Book Chapter
ISBN: 9781118844960
Divisions: Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2016 Wiley & Blackwell Publishing
Deposited On: 04 May 2016 00:57
Last Modified: 08 May 2016 04:34

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