publication . Article . Other literature type . 2011

THE NANOGRANULAR ORIGIN OF FRICTION AND COHESION IN SHALE

Christopher P. Bobko; Younane N. Abousleiman; Franz-Josef Ulm; J. Alberto Ortega; Benjamin Gathier; Lavinia Borges;
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  • Published: 10 Dec 2011 Journal: International Journal for Numerical and Analytical Methods in Geomechanics, volume 35, pages 1,854-1,876 (issn: 0363-9061, Copyright policy)
  • Publisher: Wiley
Abstract
An inverse micromechanics approach allows interpretation of nanoindentation results to deliver cohesivefrictional strength behavior of the porous clay binder phase in shale. A recently developed strength homogenization model, using the Linear Comparison Composite approach, considers porous clay as a granular material with a cohesive-frictional solid phase. This strength homogenization model is employed in a Limit Analysis Solver to study indentation hardness responses and develop scaling relationships for indentation hardness with clay packing density. Using an inverse approach for nanoindentation on a variety of shale materials gives estimates of packing densit...
Subjects
free text keywords: Geotechnical Engineering and Engineering Geology, General Materials Science, Mechanics of Materials, Computational Mechanics, Porosity, Sphere packing, Composite material, Homogenization (chemistry), Granular material, Materials science, Geotechnical engineering, Nanoindentation, Cohesion (chemistry), Indentation hardness, Micromechanics
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