By Jacques Desrues, Gioacchino Viggiani, Pierre Bésuelle
This booklet brings jointly a complete of forty eight contributions (including five keynote papers) which have been provided on the second foreign Workshop at the program of X-ray CT for Geomaterials (GeoX 2006) held in Aussois, France, on 4-7 October, 2006.
The contributions disguise a variety of themes, from primary characterization of fabric habit to functions in geotechnical and geoenvironmental engineering. fresh advances of X-ray expertise, and software program also are mentioned. As such, this can be important studying for an individual drawn to the applying of X-ray CT to geomaterials from either basic and utilized perspectives.Content:
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Additional info for Advances in X-ray Tomography for Geomaterials
The high energy synchrotron radiation used for this study allowed to combine both fast tomography and high resolution micro tomography. This is essential for argillites, due to the fine micro structure (with zones of localized deformation which can be only a few microns wide) and their susceptibility to creep, which makes it difficult to have a stable specimen configuration if the radiation period is too long. X-ray tomography essentially measures material density distribution. During a test, changes of X-ray attenuation are therefore due to volumetric deformation.
As it will be shown in the paper, such a limitation can be overcome by complimenting X-ray CT with digital image correlation (DIC). Through the comparison of couples of reconstructed 3D images of a specimen at two successive steps of loading, this allows to measure an incremental displacement field, from which a strain tensor field can be obtained. This paper presents a few selected results from a recent, unique experimental testing program where synchrotron radiation micro tomography has been used to evaluate the onset and evolution of localized deformation in a fine-grained clayey rock under deviatoric loading.
1994). Another difficulty with experimentally detecting strain localization is associated to the very nature of localized strain. In fact, while localization can sometimes induce large volumetric deformation – either dilatancy (or crack opening) or compaction (compaction bands), depending on the material and loading conditions – in general volumetric strain in a shear band is small compared to the shear strain. Unfortunately, X-ray CT is based on transmission measurement, hence it is sensible to density variations only.
Advances in X-ray Tomography for Geomaterials by Jacques Desrues, Gioacchino Viggiani, Pierre Bésuelle