A Microphysical Model of Rock Friction and the Brittle‐Ductile Transition Controlled by Dislocation Glide and Backstress Evolution

Thom, Christopher A.; Hansen, Louis S.; Goldsby, D. L.; Brodsky, Emily E.

doi:10.1029/2022jb024150

Cited by 4 publications

(5 citation statements)

References 123 publications

(281 reference statements)

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“…In this case, the compaction viscosity would control the time scale for frictional state evolution (Chen, Niemeijer & Spiers 2017; Thom et al. 2023).…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Granular dilatancy and non-local fluidity of partially molten rock

Katz,

Rudge,

Hansen

2023

J. Fluid Mech.

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Partially molten rock is a densely packed, melt-saturated, granular medium, but it has seldom been considered in these terms. In this paper we extend the continuum theory of partially molten rock to incorporate the physics of granular media. Our formulation includes dilatancy in a viscous constitutive law and introduces a non-local fluidity. We analyse the resulting poro-viscous–granular theory in terms of two modes of liquid–solid segregation that are observed in published torsion experiments: localisation of liquid into high-porosity sheets and radially inward liquid flow. We show that the newly incorporated granular physics brings the theory into agreement with experiments. We discuss these results in the context of grain-scale physics across the nominal jamming fraction at the high homologous temperatures relevant in geological systems.

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“…In this case, the compaction viscosity would control the time scale for frictional state evolution (Chen, Niemeijer & Spiers 2017; Thom et al. 2023).…”

Section: Discussionmentioning

confidence: 99%

“…In either case, once sliding has ceased, viscous creep may lead to slow compaction of the gouge (or asperities) to increase contact area and harden the fault. In this case, the compaction viscosity would control the time scale for frictional state evolution (Chen, Niemeijer & Spiers 2017;Thom et al 2023).…”

Section: Implications For Natural Systemsmentioning

confidence: 99%

Granular dilatancy and non-local fluidity of partially molten rock

Katz,

Rudge,

Hansen

2023

J. Fluid Mech.

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“…Recently, however, a series of investigations have revealed that the friction coefficient is not a constant material parameter; rather, it is dependent on a number of factors, for example, ambient temperature, stress state, moisture, damage state, friction rate, and spatio-temporal scale (Ben-David & Fineberg, 2011;Putelat et al, 2011;Scholz, 2019;Zhang & Ma, 2021;C. X. Zhao, Liu, et al, 2023;Thom et al, 2023). Particularly, within a relatively mild ambient temperature range, the friction coefficient of rocks exhibits temperature-strengthening properties (Hu & Sun, 2020;L.…”

Section: Temperature-dependent Friction Lawmentioning

confidence: 99%

“…It is noted that in the established works devoted to constitutive modeling, the friction coefficient μ * is conventionally considered constant for the sake of simplification (Molladavoodi, 2015; Qu et al., 2021; Ren et al., 2022; Zhao, Shao, & Zhu, 2018). Recently, however, a series of investigations have revealed that the friction coefficient is not a constant material parameter; rather, it is dependent on a number of factors, for example, ambient temperature, stress state, moisture, damage state, friction rate, and spatio‐temporal scale (Ben‐David & Fineberg, 2011; Putelat et al., 2011; Scholz, 2019; Zhang & Ma, 2021; C. X. Zhao, Liu, et al., 2023; Thom et al., 2023). Particularly, within a relatively mild ambient temperature range, the friction coefficient of rocks exhibits temperature‐strengthening properties (Hu & Sun, 2020; L. N. Y. Wong et al., 2020; F. B. Yang et al., 2022).…”

Section: Formulation Of a New Micro‐thermomechanical Modelmentioning

confidence: 99%

Micro‐Thermomechanical Modeling of Rocks With Temperature‐Dependent Friction and Damage Laws

Lv,

Ren,

Lai

et al. 2024

JGR Solid Earth

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Temperature serves as a critical yet elusive factor impacting the mechanical properties of deep rocks. In this work, we shall develop a new micro‐thermomechanical model for rocks based on the Mori‐Tanaka homogenization scheme. Free energy and thermodynamic forces are deduced within the framework of irreversible thermodynamics, including the local stress applied on the mesocracks, damage driving force, macroscopic stress, and entropy. The salient innovation of this study lies in formulating subtle physically based temperature‐dependent friction and damage laws, considering the influence of ambient temperature on the mesocracking in rocks. Through a coupled friction‐damage analysis, a temperature‐dependent quasi‐static strength criterion and analytical stress‐strain‐damage relations are then derived. Physical implications and calibration methods of each parameter in the proposed model are meticulously presented. Furthermore, a semi‐implicit plasticity damage decoupled procedure (SIPDDC) integration algorithm is employed for the numerical implementation of the proposed model. Subsequently, numerical simulations are conducted to obtain the mechanical response of Jinping marble, Beibei sandstone, and Gongjue granite under various real‐time temperature‐confining pressure coupling conventional triaxial compression tests (TP‐CTC). The congruence of stress‐strain curves between model predictions and experimental data validates the robust performance and potential applicability of the proposed model.

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“…The underlying physics of contact asperity friction on the microscale is still a matter of debate (e.g., Aharonov & Scholz, 2018; Chen et al., 2021; Thom et al., 2023), and the frictional properties and stability of faults are expected to depend on multiple parameters, such as temperature, pressure (or normal stress and pore pressure), fault roughness, composition, and sliding rate (e.g., Blanpied et al., 1991; Han et al., 2007, 2010; Hayward & Cox, 2017; Hayward et al., 2019; He et al., 2007; Scholz, 2019; Stesky, 1978; Verberne et al., 2020; Yao et al., 2016). Among them, temperature and pressure are the two most important environmental factors affecting the frictional properties and stability of faults and have been extensively studied in many friction experiments on carbonate rocks, which are an important constituent of the Earth's crust.…”

Section: Introductionmentioning

confidence: 99%

Experimental Insights Into Fault Reactivation and Stability of Carrara Marble Across the Brittle–Ductile Transition

Niu,

Zhou,

Shao

et al. 2024

JGR Solid Earth

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Little is known about the impact of pressure (P) and temperature (T) on faulting behavior and the transition to fault locking under high P–T conditions. Using a Paterson gas‐medium apparatus, triaxial compression experiments were conducted on Carrara marble (CM) samples containing a saw‐cut interface at ∼40° to the vertical axis at a constant axial strain rate of ∼1 × 10−5 s−1, P = 30–150 MPa and T = 20–600°C. Depending on the P–T conditions, we observed the complete spectrum of deformation behavior, including macroscopic (shear) failure, stable sliding, unstable stick‐slip, and bulk deformation with locked faults. Macroscopic failure and stable sliding were limited to P < 100 MPa and T = 20°C. In contrast, at P ≥ 100 MPa or T ≥ 500°C, faults were locked, and samples with bulk deformation experienced strain hardening at strains ≤8.8%. At T = 100–400°C and P ≤ 100 MPa, we observed unstable stick‐slip behavior, where both fault reactivation stress and subsequent stress drop increased with increasing pressure and temperature, associated with increasing matrix deformation and less fault slip. Microstructures indicate a mixture of microcracking, twinning and dislocation activity (e.g., kinking and undulatory extinction) that depends on P–T conditions and peak stress. The transition from slip to lock‐up with increasing pressure and temperature is induced by an enhanced contribution of crystal plastic deformation. Our results show that fault reactivation and stability in CM are significantly influenced by P–T conditions, probably limiting the nucleation of earthquakes to a depth of a few kilometers in calcite‐dominated faults.

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A Microphysical Model of Rock Friction and the Brittle‐Ductile Transition Controlled by Dislocation Glide and Backstress Evolution

Cited by 4 publications

References 123 publications

Granular dilatancy and non-local fluidity of partially molten rock

Granular dilatancy and non-local fluidity of partially molten rock

Micro‐Thermomechanical Modeling of Rocks With Temperature‐Dependent Friction and Damage Laws

Experimental Insights Into Fault Reactivation and Stability of Carrara Marble Across the Brittle–Ductile Transition

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