The upper portion of the Earth's crust contains a hierarchy of structural features that span a wide range of length scales. The evolution of these features in response to dynamic and quasistatic loading remains a challenging problems in geophysics and geomechanics. The problem is further complicated by the highly nonlinear nature of friction and deformation at microscale. Faulting, brittle to ductile transition, strain localization and comminution are some of the important mechanisms contributing to mutiscale damage complexity in solids. This minisymposium welcomes contributions in the broad field of damage modeling in quasi-brittle solids with a special focus on applications related to rock mechanics and earthquake physics. Topics include but not limited to: 1) Modeling of breakage and healing mechanisms in granular materials, 2) Modeling of wear and rock comminution, 3) Mechanisms of strain localization under dynamic loading, 4) Conditions for Brittle to ductile transition in rocks and gouge, and 5) Dynamic rupture simulation on frictional surfaces.

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A computational study of adhesion between rough surfaces in contact

Srivatsan Hulikal, Caltech, United States
Nadia Lapusta, Caltech, United States
Kaushik Bhattacharya, Caltech, United States

Avalanches and fractals at elastic–plastic–brittle transitions in disordered media

Martin Ostoja-Starzewski, University of Illinois at Urbana-Champaign, United States

Crack propagation in bone at the microscale: effect of the interfibrillar glue molecules with sacrificial bonds and hidden length

Wenyi Wang, UIUC

Development of a side-impact pulse-shaping torsional Kolsky bar

Benjamin Claus, Purdue University, United States
Wayne Chen, Purdue University, United States
Xu Nie, University of North Texas, United States
Brad Martin, Air Force Research Laboratory, United States

Earthquake nucleation and propagation on rate and state faults: single versus two state variables formulation and evolution by Kato–Tullis law

Ahmed Elbanna, University of Illinois at Urbana, Champaign, United States
Xiao Ma, University of Illinois at Urbana, Champaign, United States

Failure of brittle heterogeneous materials: intermittency, crackling, and seismicity

Jonathan Bares, Duke University, United States
Daniel Bonamy, CEA, Saclay, France
Davy Dalmas, UMR CNRS-St Gobain, France

Scaling laws for stress and energy for an interface with strong rate weakening friction

Yuyang Rao, UIUC
Ahmed Elbanna, UIUC, United States

Sheared granular layers: Competition between flash heating and particle comminution

Rui Li, University of Illinois at Urbana-Champaign, United States
Ahmed Elbanna, University of Illinois at Urbana-Champaign, United States

Towards a unified framework for modeling fault zone evolution: From particles comminution to secondary faults branching

Ahmed Elbanna, UIUC, United States
Xiao Ma, UIUC, United States