The objective of this work was to observe and quantify the onset evolution localised deformation processes in sand with grain-scale resolution. key element proposed approach is combining state-of-the-art X-ray micro tomography imaging three-dimensional volumetric digital image correlation techniques. This allows not only details a deforming specimen be viewed, but also, more importantly, evolving displacement strain fields throughout loading assessed. have been past applied individually...

Abstract: A set of triaxial compression tests on specimens argillaceous rock were performed under tomographic monitoring at the European Synchrotron Radiation Facility in Grenoble, France, using an original experimental set‐up developed Laboratoire 3S , Grenoble. Complete 3D images recorded throughout each test X‐ray microtomography. Such subsequently analysed a Volumetric Digital Image Correlation software de Mécanique des Solides Palaiseau, France. Full‐field incremental strain...

NeXT-Grenoble is a Neutron and X-ray Tomograph launched from the collaboration between Universite Grenoble Alpes (UGA) Institut Laue Langevin (ILL). The design started in February 2016 shortly followed by its construction at ILL. A first version of instrument has been opened to users since October 2016. One peculiarities that, as suggested name, allows acquisition truly simultaneous tomographies, taking advantage high complementarity these two beams. Also virtue uniquely flux ILL, can...

We show experimentally that the sliding friction on sand is greatly reduced by addition of some—but not too much—water. The formation capillary water bridges increases shear modulus sand, which facilitates sliding. Too much water, other hand, makes coalesce, resulting in a decrease modulus; this case, we observe coefficient again. Our results, therefore, directly related to has important repercussions for transport granular materials. In addition, polydispersity shown also have large effect...

Views Icon Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Twitter Facebook Reddit LinkedIn Tools Reprints and Permissions Cite Search Site Citation Guillaume Ovarlez, Fabien Mahaut, Stéphanie Deboeuf, Nicolas Lenoir, Sarah Hormozi, Xavier Chateau; Flows of suspensions particles in yield stress fluids. Journal Rheology 1 November 2015; 59 (6): 1449–1486. https://doi.org/10.1122/1.4934363 Download citation file: Ris (Zotero) Reference Manager EasyBib...

We study the flow of suspensions non-Brownian particles dispersed in a Newtonian solvent.

Here, we report on a new record in the acquisition time for fast neutron tomography. With an optimized imaging setup, it was possible to acquire single radiographic projection images with 10 ms and full tomographies 155 projections physical spatial resolution of 200 µm within 1.5 s. This is about 6.7 times faster than current record. We used technique investigate water infiltration soil living lupine root system. The setup will be part future NeXT instrument at ILL Grenoble great field applications.

What originally appeared to be only an external cast of anuran 'mummy' from the Quercy Phosphorites (southwestern France) was described as Rana plicata during 19th century. Its geographical provenance is vaguely known; therefore its precise age within Paleogene uncertain. The taxon erected on basis morphology specimen, which includes few diagnostic characters. As a further complication, name recently shown unavailable at time description, and cadurcorum proposed replacement. In order see...

The paper presents selected results from an experimental testing program recently performed at the ESRF, where high resolution, fast X-ray micro tomography was used to evaluate onset and evolution of strain localization in Callovo-Oxfordian argillite under deviatoric loading. In situ allowed detailed observations different load levels. CT complimented with 3D digital image correlation obtain a sequence incremental fields deforming specimen.

The Callovo-Oxfordian claystone is a material with notoriously complex hydro-mechanical behaviour. Combined neutron and x-ray tomography modalities are used for the first time to characterise dynamics of water absorption in this by comparing deformation as well arrival. Exploiting recent work on multimodal registration, datasets registered pairwise into common coordinate system, meaning that vector-valued field (\textit{i.e.} reconstructed values) available each timestep, essentially making...

Increasingly, environmental research efforts seek to understand how the continuous input of microplastics into terrestrial environments alters soil physicochemical properties and affects plants other biota. However, fundamental understanding is hampered by destructive nature current analytical techniques, which typically require disruption samples often removal organic matter. This results in irretrievable loss essential information about microstructure spatial distribution microplastic...

While many aspects of the growth mechanisms plant roots and their ability to adapt surrounding environment are now clearer from a biological perspective, relatively limited research has focused on mechanical interaction root soil in which it grows, including trajectory strain developing soil. The use x-ray tomography allows for 4D (space plus time) analysis such an interaction. This paper investigates how grow when approaching harder-to-penetrate – here, finer denser sand. trajectories 9...

A large and increasing number of scientific domains pushes for high neutron imaging resolution achieved in reasonable times. Here we present the principle, design performance a detector based on infinity corrected optics combined with crystalline Gd3Ga5O12 : Eu scintillator, which provides an isotropic sub-4 µm true resolution. The exposure times are only few minutes per image. This is made possible also by uniquely intense cold flux available at beamline NeXT-Grenoble. These comparatively...

Real-time X-ray microtomography is used to study the underlying mechanisms of yielding and collapse a closed-cell metallic glass foam (see figure). Intercellular intracellular deformations upon compressive loading are examined in situ. A shear-stability analysis reveals that glassy foams obey same universal yield criterion as zero-temperature glasses, suggesting link between floppy modes buckling instabilities stochastic cellular structure. Supporting information for this article available...

Short glass fibre reinforced thermoplastics are promising materials for weight reduction of structures thanks to its very good specific mechanical properties. The current challenge is provide experimental data concerning damage mechanisms and their kinetics in order enhance micromechanical models these with complex behaviour. objective this work therefore observe explain regarding spatial configuration the microstructure. Fatigue tests have been running on polyamide specimens interrupted at...

A key element in the understanding of rheological behavior suspensions is their microstructure. Indeed, spatial distribution particles known to depend on flow history suspensions, which has an impact macroscopic properties. These micro-macrocouplings appeal for development experimental tools allowing characterization a suspension and imaging particles. In this paper, we present technique developed image three dimensions microstructure non-Brownian particles, using X-ray computed tomography...

Frequency modulated continuous wave (FMCW) radar in the K-band has been shown to be an effective detector of geomaterial physical properties being highly sensitive rock characteristics, particularly mineral composition and, for porous rock, variations liquid water content. This research demonstrates that contrasts FMCW return signals with time correlate changes signal returns were acquired sandstone samples subjected controlled injection while also a neutron beam, taking advantage...

Water significantly influences the mechanical behaviour of all granular materials but none as much hygroscopic amorphous particles. With sufficiently high water content, particles can swell, agglomerate and their properties be reduced, having direct effects on macroscopic response material. In food pharmaceutical industry this cause loss product functionality. Despite relevance, very little is known about microscopic processes that induce these phenomena. Previous studies focused single...