Experimental investigation of the effects of particle shape and friction on the mechanics of granular media

This dataset corresponds to the raw data and experimental measurements of the PhD thesis "Experimental investigation of the effects of particle shape and friction on the mechanics of granular media" of Gustavo Pinzón (2023, Université Grenoble Alpes), available at: https://hal.science/tel-04202827v1. 
The experiments correspond to a drained triaxial compression test of cylindrical granular specimens, a common  testing procedure used in soil mechanics to characterise the mechanical response of a specimen under deviatoric loading. Each specimen is 140mm in height and 70mm in diameter, and is composed of more than 20000 ellipsoidal particles of a given aspect ratio and interparticle friction. The dataset comprises the test of six specimens, as a result of the combination of 3 particles shapes (Flat, Medium, and Rounded) and 2 values of interparticle friction (Rough and Smooth). A naming system for the specimens is adopted to reflect the morphology of the composing particles (e.g., the test EFR correspond to the specimen with Flat and Rough particles). Further details on the experimental methods are found in Ch. 2 of the thesis.
 The compression tests are performed inside the x-ray scanner of Laboratoire 3SR in Grenoble (France), where the specimens are scanned each 0.5% of axial shortening, at an isotropic voxel size of 100 micrometer per pixel. The obtained radiographies are reconstructed using a Filtered Back Projection algorithm, using the software given by the x-ray cabin manufacturer (RX Solutions, France). The series of obtained 16-bit greyscale 3D images are processed with the open source software spam, version 0.6.2. The coordinate system of all the images is ZYX, where Z corresponds to compression direction. Further details on the image analysis techniques are found in Ch. 3 of the thesis.
Additional greyscale images, raw projections, and x-ray tomography files are available upon request. For visualisation purposes, the 3D images in .tif format can be opened using Fiji.