Tracking the dynamic morphology of active materials during operation lithium batteries is essential for identifying causes performance loss. Digital volume correlation (DVC) applied to high-speed operando synchrotron X-ray computed tomography a commercial Li/MnO2 primary battery discharge. Real-time electrode material displacement captured in 3D allowing degradation mechanisms such as delamination from current collector and crack formation be identified. Continuum DVC consecutive images...

Abstract Digital volume correlation analysis of time‐resolved X‐ray microtomography scans acquired during in situ triaxial compression Green River shale cores provided time series 3‐D incremental strain fields that elucidated evolving deformation processes by quantifying microscopic localization. With these data, we investigated the impact mechanical anisotropy on localization culminating macroscopic shear failure. We conducted experiments with maximum compressive stress, σ 1 , aligned...

Abstract In this work, we suggest a modified phase-field model for simulating the evolution of mixed mode fractures and compressive driven in porous artificial rocks Neapolitan Fine Grained Tuff. The numerical has been calibrated using experimental observations rock samples with single saw cut under uniaxial plane strain compression. For purpose validation, results from are compared to Meuwissen different angles bridge inclination subjected uni-axial simulated data, both qualitatively...

Abstract This study utilizes advanced 3D imaging techniques, combining X-ray and neutron tomography, to investigate the hydromechanical evolution of Idaho Gray sandstone during coupled triaxial permeability tests. The analysis involved correlating mechanical hydraulic bulk measurements, porosity fields, strain fields derived from Digital Volume Correlation fluid speed time series tomograms. experimental approach provides an improved understanding relationship between volume active pores...

Recent studies have demonstrated that the combination of x-ray tomography during triaxial tests ("in-situ" tests) and 3D- volumetric Digital Image Correlation (3D-DIC) can provide important insight into mechanical behaviour deformation processes granular materials such as sand. The application these tools to investigate mechanisms failure in rocks is also obvious interest. However, relevant applied confining pressures for testing on are higher than those sands therefore stronger pressure...

Abstract To comprehend the most detrimental characteristics behind bone fractures, it is key to understand material and tissue level strain limits their relation failure sites. The aim of this study was investigate three-dimensional distribution its evolution during loading at sub-trabecular in trabecular tissue. Human cadaver samples were compressed situ until failure, while imaging with high-resolution synchrotron radiation X-ray tomography. Digital volume correlation used determine...

Abstract In this work, we propose a modified phase-field model for simulating the evolution of mixed mode fractures and compressive driven in porous artificial rocks. For purpose validation, behaviour rock samples, with either single or double saw cuts, under uniaxial plane strain compression has been numerically simulated. The simulated results are compared to experimental data, both qualitatively quantitatively. It is shown that proposed able capture commonly observed propagation pattern...

Abstract High‐speed neutron tomographies (1‐min acquisition) have been acquired during water invasion into air‐filled samples of both intact and deformed (ex situ) Vosges sandstone. Three‐dimensional volume images processed to detect track the evolution waterfront calculate full‐field measurement its speed advance. The flow process correlates well with known rock properties is especially sensitive distribution altered associated observed localized deformation, which independently...

The localized deformation patterns developed during in-plane compression and folding of paperboard have been studied in this work. X-ray post-mortem images reveal that cellulose fibres reoriented along bands both the tests. In folding, typically fails on side where compressive stresses exists wrinkles are formed. test is however difficult to perform because slender geometry paperboard. A common technique determine strength use so-called short-span (SCT). SCT, a with free length 0.7 mm...

The question of registering two images (or image volumes) acquired with different modalities, and thus exhibiting contrast, at positions is addressed based on an extension global digital volume) correlation. A specific comparison metric introduced allowing the signature phases to be related. first solution consists a Gaussian mixture describe joint distribution gray levels, which not only provides matching both images, but also offers natural segmentation indicator. second 'self-adapting'...

Long-term stability of endosseous implants depends on successful bone formation, ingrowth and adaptation to the implant. Specifically, it will define mechanical properties newly formed bone-implant interface. 3D imaging during loading tests (in situ loading) can improve understanding local processes leading damage failure. In this study, titanium screws were implanted into rat tibiae allowed integrate for 4 weeks with or without addition growth factor Bone Morphogenetic Protein...

Better understanding of the local deformation bone network around metallic implants subjected to loading is importance assess mechanical resistance bone-implant interface and limit implant failure. In this study, four titanium screws were osseointegrated into rat tibiae for 4 weeks screw pullout was conducted in situ under x-ray microtomography, recording macroscopic behavior full tomographies at multiple load steps before Images analyzed using Digital Volume Correlation (DVC) access...

Abstract The bone tissue formed at the contact interface with metallic implants, particularly its 3D microstructure, plays a pivotal role for structural integrity of implant fixation. X-ray tomography is classical imaging technique used accessing microstructural information from tissue. However, neutron has shown promise visualising immediate bone-metal interface, something which highly challenging x-rays due to large differences in attenuation between metal and biological causing image...

Although many studies have been performed to investigate the spectral induced polarization (SIP) response of nonaqueous phase liquid (NAPL)-contaminated soil samples, there are still uncertainties in interpretation data. A key issue is that altered pore space geometries due presence a NAPL will change measured IP spectra. However, without any information on distribution space, assumptions necessary for SIP data interpretation. Therefore, experimental signals directly associated with...

Abstract This paper reports the main results of an experimental study on mechanics intensely fissured natural clays, extending our previous studies scaly clay from Santa Croce di Magliano. While work focused influence orientation fissures with respect to loading direction, present investigation specifically explores additional, important variable: stress level. The combined effect fissure and confining pressure was studied by setting up a large campaign plane strain compression experiments,...

Abstract Neutron imaging is used for direct observation of evolving water–air and deuterated water–normal water exchanges in flow experiments performed on a laboratory-deformed, microporous laminated limestone, an extremely fine-textured rock altered by arrays superposed fractures generated mechanics apparatus. The neutron images document significant, evolving, speed direction variability at the deci-micron scale spatially complex patterns both increasing decreasing saturation. We infer that...

Variation of mechanical properties in materials can be detected non-destructively using ultrasonic measurements. In particular, changes elastic wave velocity occur due to damage, i.e., micro-cracking and particles debonding. Here the challenge characterizing damage geomaterials, rocks soils, is addressed. Geomaterials are naturally heterogeneous media which deformation localize, so that few measurements acoustic across sample not sufficient capture heterogeneities. Therefore, an tomography...

The behaviour of subsurface-reservoir porous rocks is a central topic in the resource engineering industry and has relevant applications hydrocarbon, water production, CO2 sequestration. One key open issues effect deformation on hydraulic properties host rock and, specifically, saturated environments. This paper presents novel full-field data set describing hydro-mechanical geomaterials through situ neutron X-ray tomography. use high-performance imaging facilities such as CONRAD-2...