Experimental characterisation of (localised) deformation phenomena in granular geomaterials from sample down to inter- and intra-grain scales

Summary, in English

This paper outlines some recent advances in the full-field experimental characterisation of the mechanics of granular geomaterials (in particular, sands) using a range of methods that provide characterisation at different scales, from the sample-scale down to the inter- and intra-grain scale. The techniques used are “full-field” approaches involving in-situ x-ray micro-tomography, 3D-volumetric digital image analysis/correlation and grain ID-tracking, in-situ 3D x-ray diffraction and in-situ, spatially-resolved neutron diffraction. These methods provide new data on the mechanics of sand at different scales, including continuum measures of strain, porosity, and fabric plus discrete measures of particle kinematics and force transmission. The results of such measurements might be used to advance higher-order continuum theories, and provide the necessary input parameters, or to calibrate discrete grain-scale simulations of sand behaviour to explore loading paths that are inaccessible in the laboratory.

• Författare: Stephen Hall; Jacques Desrues; Gioacchino Viggiani; Bésuelle Pierre; Andò Edward
• Avdelning/ar: Hållfasthetslära
• Publiceringsår: 2012
• Språk: Engelska
• Sidor: 54-65
• Publikation/Tidskrift/Serie: Procedia Iutam
• Volym: 4
• Länkar: http://dx.doi.org/10.1016/j.piutam.2012.05.007
• Dokumenttyp: Artikel i tidskrift
• Förlag: Elsevier
• Ämne: Mechanical Engineering
• Nyckelord: Full field characterisation; x-ray tomography; 3D image analysis; digital volume correlation; x-ray & neutron diffraction
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 2210-9838