Browsing Institutt for geofag by Author "Dysthe, Dag Kristian"

Now showing items 1-9 of 9

  • Cavity Formation in Confined Growing Crystals 
    Kohler, Felix; Gagliardi, Luca; Pierre-Louis, Olivier; Dysthe, Dag Kristian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Growing crystals form a cavity when placed against a wall. The birth of the cavity is observed both by optical microscopy of sodium chlorate crystals (NaClO3) growing in the vicinity of a glass surface, and in simulations ...
  • Dynamic in situ three-dimensional imaging and digital volume correlation analysis quantify strain localization and fracture coalescence in sandstone 
    Renard, Francois; McBeck, Jessica Ann; Cordonnier, Benoit; Zheng, Xiaojiao; Kandula, Neelima; Sanchez, Jesus Rodriguez; Kobchenko, Maya; Noiriel, Catherine; Zhu, Wenlu; Meakin, Paul; Fusseis, Florian; Dysthe, Dag Kristian (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    Advances in triaxial compression deformation apparatus design, dynamic X-ray microtomography imaging, data analysis techniques, and digital volume correlation analysis provide unparalleled access to the in situ four-dimensional ...
  • Dynamics of microscale precursors during brittle compressive failure in Carrara marble 
    Kandula, Neelima; Cordonnier, Benoit; Boller, Elodie; Weiss, Jérôme; Dysthe, Dag Kristian; Renard, Francois (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Microscale heterogeneities influence failure mechanisms in the crust. To track the microstructural changes in rock samples when loaded until failure, we employed a novel experimental technique that couples dynamic X‐ray ...
  • Experimental investigation of surface energy and subcritical crack growth in calcite 
    Røyne, Anja; Bisschop, Jan; Dysthe, Dag Kristian (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
    [1] Subcritical cracking behavior and surface energies are important factors in geological processes, as they control time-dependent brittle processes and the long-term stability of rocks. In this paper, we present ...
  • First principles model of carbonate compaction creep 
    Keszthelyi, Dániel; Dysthe, Dag Kristian; Jamtveit, Bjørn (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Rocks under compressional stress conditions are subject to long‐term creep deformation. From first principles we develop a simple micromechanical model of creep in rocks under compressional stress that combines microscopic ...
  • Fluid expulsion and microfracturing during the pyrolysis of an organic rich shale 
    Panahi, Hamed; Kobchenko, Maya; Meakin, Paul; Dysthe, Dag Kristian; Renard, Francois (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2019)
    During progressive burial, low permeability organic-rich shale rocks evolve chemically and physically as the temperature and stress increase and organic matter matures. The transformation of organic matter into hydrocarbon, ...
  • A high resolution interferometric method to measure local swelling due to CO<sub>2</sub> exposure in coal and shale 
    Pluymakers, Anne Marie Henriette; Liu, J.; Kohler, Felix; Renard, Francois; Dysthe, Dag Kristian (Journal article / Tidsskriftartikkel / SubmittedVersion, 2018)
    We present an experimental method to study time-dependent, CO2-induced, local topography changes in mm-sized composite samples, plus results showing heterogeneous swelling of coal and shale on the nano- to micrometer scale. ...
  • In-situ imaging of fracture development during maturation of an organic-rich shale: Effects of heating rate and confinement 
    Panahi, Hamed; Kobchenko, Maya; Meakin, Paul; Dysthe, Dag Kristian; Renard, Francois (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    The statistics and dynamics of fractures formed during the accelerated maturation of kerogen-rich shale was investigated by heating Green River Shale (R-8 unit, Piceance Basin, northwestern Colorado) core samples while 3D ...
  • Synchrotron 4D X-Ray Imaging Reveals Strain Localization at the Onset of System-Size Failure in Porous Reservoir Rocks 
    Kandula, Neelima; McBeck, Jessica Ann; Cordonnier, Benoît; Weiss, Jérôme; Dysthe, Dag Kristian; Renard, François (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Understanding the mechanisms of strain localization leading to brittle failure in reservoir rocks can shed light on geomechanical processes such as porosity and permeability evolution during rock deformation, ...