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25 results for “Strain Localization”
Dataset of "The Impact of Local Strain Fields in Noncollinear Antiferromagnetic Films"
<p>Antiferromagnets hosting structural or magnetic order that breaks time reversal symmetry are of increasing interest for “beyond von Neumann” computing applications because the topology of their band structure allows for intrinsic physical properties, exploitable in integrated memory and logic function. One such group are the noncollinear antiferromagnets. Essential for domain manipulation is the existence of small net moments found routinely when the material is synthesized in thin film form and attributed to symmetry breaking caused by spin canting, either from the Dzyaloshinskii–Moriya interaction or from strain. Although the spin arrangement of these materials makes them highly sensitive to strain, there is little understanding about the influence of local strain fields caused by lattice defects on global properties, such as magnetization and anomalous Hall effect. This premise is investigated by examining noncollinear antiferromagnetic films that are either highly lattice mismatched or closely matched to their substrate. In either case, edge dislocation networks are generated and for the former case, these extend throughout the entire film thickness, creating large local strain fields. These strain fields allow for finite intrinsic magnetization in seemingly structurally relaxed films and influence the antiferromagnetic domain state and the intrinsic anomalous Hall effect. The dataset consists of total energies calculated by density functional theory (VASP). The experimental data presented in the paper were obtained by international partners not supported by OP-JAK project.</p>
Combining Horizontal Strain DAS and Local Seismic Stations in a Full Waveform Attribute Stacking Detector/Locator Algorithm: Verification Test for the Thorbjörn, Iceland, 2020 Unrest Episode
<p>We present a waveform stacking-based earthquake catalog of the seismicity unrest episode in the Svartsengi fissure swarm close to Mt. Thorbjörn, SW Iceland, which started in January 2020 and was still ongoing in January 2021. The magmatic unrest produced more than 5 earthquake swarms comprising thousands of individual events each. We were able to combine local and regional seismic networks with 6 months recording of a 17 km long distributed acoustic sensing (DAS) fibre optical cable with a channel resolution of 4 m. The kHz DAS data were downsampled to 200 Hz and stacked every 64 m. The catalog is based on a migration-based detector / locator technique as for instance implemented in Lassie (Pyrocko). In the accompanying we demonstrate the robustness in a wide variety of applications in seismology. For this dataset, we have extended Lassie to efficiently combine linear ultra-dense sensor arrays with sparse seismological networks.</p>
RAW SEM images mosaics dataset for the HRDIC strain localization study in shot peened Ni superalloy
<p>We used a FEI Magellan HR 400L FE-SEM with a theoretical resolution of ≤ 0.9 nm at <1kV and ≤ 0.8 nm at ≥ 5kV to take backscattered electron images of the fine, homogeneous distributed gold speckle pattern obtained by remodelling of a thin gold layer previously deposited on the polished sample surface. The images were obtained at a working distance of 3.5 mm, 5 kV and 0.8 nA beam current. Mosaics of 30x15 images were used to cover 950x420 µm<sup>2</sup>. Each image contains 2048 x 1768 pixels and has a horizontal field of view of 43 µm. The images were overlapped by 20% to enable easy stitching prior to the digital image correlation. We obtained 7 mosaics, one before tensile testing and 6 after each deformation step.</p> <p>This set of images at different strain steps is coupled with the EBSD data set in https://doi.org/10.5281/zenodo.4730184, the HRDIC strain maps in http://doi.org/10.5281/zenodo.4728016 and data visualisation scripts in http://doi.org/10.5281/zenodo.4727939</p> <p>0_def corresponds to the undeformed sample, while 1_def to 6_def were obtained after each deformation step.</p>
Supplementary Data for Progressive Strain Localization with Structural Evolution of Faults and Implications for Earthquake Characteristics
<p>Fault slip measurements from geodetic imaging data (pixel offsets and InSAR) for 16 strike-slip earthquakes. </p> <p>Data columns are: Longitude, Latitude, Fault Slip (meters), 1-sigma uncertainty (meters)</p>
Strain localization in sandstone-derived fault gouges under conditions relevant to earthquake nucleation
<p>Constraining strain localization and the growth of shear fabrics within brittle fault zones at sub-seismic slip rates are important for understanding fault strength and frictional stability. We conducted direct shear experiments on simulated sandstone-derived fault gouges at an effective normal stress of 40 MPa, pore fluid pressure of 15 MPa, and temperature of 100°C. Using a passive strain marker and X-ray Computed Tomography (XCT), we analyzed the spatial deformation of the gouge samples obtained from the strain-hardening stage to strain-softening stage to steady-state at shearing velocities of 1, 30, and 1000 µm/s. We developed a machine-learning-based automatic boundary detection method to recognize the shear zone fabrics and quantify the slip partitioning between each fabric element. Our results show that R1 and Y (or boundary) shears are the two major shear zone fabrics. At velocities of 1 and 30 µm/s, the relative amount of slip on R1 shears is displacement dependent and increases to ~20% at the strain-softening stage and then decreases to ~10–18% at steady-state. This trend is absent at high velocity with an amount of ~18% through all investigated stages. At all velocities, the relative amount of slip on Y and boundary shears increases linearly with displacement to a total of more than 50% at steady-state. Our study provides constraints for the development of the active slip zone, which is an important input parameter for the heat budget for small-magnitude earthquakes with limited slip (mm-dm), such as those occurring in induced seismicity.</p>
The effect of shear strain and shear localization on fault healing
<p>This is the ReadMe file corresponding to the study entitled:<br> "The effect of shear strain and shear localization on fault healing"<br> By Noël C., Giorgetti C., Collettini C. and Marone C.</p> <p>This Read-Me file has been last edited in August 2023</p> <p>This readme file describes the data repository and supplementary files accompanying the above publication. <br> For any further queries please contact corentin.noel@geoazur.unice.fr</p>
Strain localization in sandstone-derived fault gouges under conditions relevant to earthquake nucleation
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Data for "Investigation of local strain rate sensitivity in dual-phase Ti alloys by nanoindentation"
<p>Data for "Investigation of local strain rate sensitivity in dual-phaes Ti alloys by nanoindentation"</p> <p>Tea-Sung Jun1, David E.J. Armstrong2 and T. Benjamin Britton1<br /> 1. Department of Materials, Imperial College London, Prince consort Road, London, SW7 2AZ, UK<br /> 2. Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK</p> <p>--</p> <p>This nanoindentation data folder contains 3 subfolders:<br /> (1) Raw indentation data obtained from TestWorks<br /> (2) Data for Figure 4<br /> (3) Data for Figure 5</p> <p>--</p> <p>In the subfolder (1), each file name indicates Material_Grain orientation_Indentation strain rate (e.g. 6242_H_0001). <br /> For the subfolders (2) and (3), readers can plot the graphs either using Excel, OriginPro or other software. <br /> Note that we used the OriginPro to generate all the graphs in this article.</p> <p>--</p> <p>If readers need further information, please feel free to contact: t.jun@imperial.ac.uk or terryjun83@gmail.com (Tea-Sung (Terry) Jun)</p>
Data for "Local strain rate sensitivity of single α phase within a dual-phase Ti alloy"
<p>Data for "Local strain rate sensitivity of single a phase within a dual-phase Ti alloy"</p> <p>Tea-Sung Jun, Zhen Zhang, Giorgio Sernicola, Fionn P.E. Dunne and T. Benjamin Britton<br /> Department of Materials, Imperial College London, Prince consort Road, London, SW7 2AZ, UK</p> <p>--</p> <p>This micropillar compression data folder contains 6 subfolders:<br /> (1) Micropillar compression videos<br /> (2) Data for Figure 6<br /> (3) Data for Figure 7<br /> (4) Data for Figure 10<br /> (5) Data for Figure 11<br /> (6) Data for Figure 12</p> <p>--</p> <p>In the subfolder (1), each file name indicates 'Pillar name (Slip system, Strain rate)', e.g. Pillar 1 (Basal, 0.01). <br /> For the subfolders (2) ~ (6), readers can plot the graphs either using Excel, OriginPro or other software. <br /> Note that we used the OriginPro to generate all the graphs in this article.</p> <p>--</p> <p>If readers need further information, please feel free to contact: t.jun@imperial.ac.uk or terryjun83@gmail.com (Tea-Sung (Terry) Jun)</p>
Supplementary Data for Study on Strain Localization of Strike-Slip Fault Systems
<p>Point displacement measurements of fault slip from geodetic imaging and field surveying used to estimate off-fault deformation. </p>
Dataset for "Co-Localization of Microstructural Damage and Excessive Mechanical Strain at Aortic Branches in Angiotensin-II Infused Mice"
<p>This dataset contains geometries and simulation files for the manuscript "Co-Localization of Microstructural Damage and Excessive Mechanical Strain at Aortic Branches in Angiotensin-II Infused Mice", to be published in the journal "Biomechanics and Modeling in Mechanobiology".</p> <p>For each animal described in the study, the following data are uploaded:</p> <p>[mouse name]_Strain.vtp contains the Eulerian strain estimation for each abdominal aorta mapped back on the ex vivo undeformed configuration.</p> <p>[mouse name]_Scan.vtp is the abdominal aorta in the ex vivo undeformed configuration, as scanned using PCXTM imaging.</p> <p>[mouse name]_Exitron.vtp is the distribution of contrast agent infiltration along the aorta (can be superimposed to the corresponding ‘scan.vtp’ file), which serves a surrogate for vascular damage.</p> <p>The aortic partitioning described in the paper’s method section was performed on all of the above .vtp files for every animal. .vtp files can be visualized in the open-source Paraview or similar software, and used for centerline calculations using the open-source vmtk software.</p>
Data in support of : Volumetric Deformation Feedback on Fault Stability and Strain Localization Precursor to Stick-Slip Behavior in Laboratory Earthquakes.
<p>This folder contains 3 .txt files:</p> <p> </p> <p>LP1 — low pressure data set.</p> <p>HP1 — High confining pressure experiement.</p> <p>HP2 — High cinfining pressure repeat experiment.</p> <p> </p> <p>The .txt files contain the following columns: Time (s), Pc (bar), VerticalLoad (kN), Horizontalload (kN), DisplacementOE (mm), StrainSG_xx, StrainSG_yy, StrainSG_xy.</p> <p>Strain gauge data are pre-filtered. All other data are raw.</p>
Dataset for "Micromechanics and Strain Localization in Sand in the Ductile Regime"
<p>This dataset contains tomography images and stress-strain curves used in the publication titled "Micromechanics and Strain Localization in Sand in the Ductile Regime" in the Journal of Geophysical Research: Solid Earth</p>
Dataset for article titled "Assessing continuum plasticity postulates with grain stress and local strain measurements in triaxially compressed sand"
<p>Dataset containing raw and processed data from experiments presented in the article titled "Assessing continuum plasticity postulates with grain-scale stress and strain measurements in triaxially-compressed sand". An enclosed PDF file describes the data.</p>
Strain partitioning and localization due to heterogeneities in the fold - and - thrust belt 2 detachment: Analogue models of progressive arcs
<p>Although most arcuate orogens are deformed as progressive arcs–curvature is acquired during12shortening-, they have been scarcely simulated by analogue modelling. Our team work designed13a backstop that deformed in map view building up fold-and-thrust belts (FTBs) that acquire14progressively its curved shape (Jiménez-Bonilla et al., 2020); silicone and sand layers15reproduced the brittle-ductile conditions expected to be common in external tectonic wedges.16However, natural cases usually includeheterogeneities in the detachment such as diapirs,17thickness variations of the viscous layer or pinch outs. Based on the same progressive arc model18setup, we present here seven new experiments including these three types of heterogeneities.19Our results show that strain was partitioned between shortening structures whose transport20directions draw a radial pattern and normal faults and oblique strike-slip faults that21accommodate arc-lengthening. Moreover, any heterogeneity conditions the wedge evolution and22the nucleation of structures. Both diapirs and the presence of a silicone pinch-out perpendicular23to the apex movement favour that frontal deformation slows down and the wedge thickens up to24reach the supercritical angle. Interestingly, the presence of diapirs or silicone thickness25variations favour the arc-parallel stretching localization close to these heterogeneities. In26addition, silicone bands parallel to the apex movement generate different structural styles along27the FTB. More frictional detachments favour thicker wedges and less frontal propagation.28Transfer zones accommodate the differential displacement between FTB segments. These29results may be useful to investigate geometric and kinematic changes along natural progressive30arcs such as the Gibraltar, Sulaiman and Zagros cases</p>
Fast grip force adaptation to friction relies on localized fingerpad strains
<p>Humans can quickly adjust their grip force to a change in friction at the object-skin interface during dexterous manipulation in a precision grip. To perform this adjustment, they rely on the feedback of the mechanoreceptive afferents innervating the fingertip skin. Because these tactile afferents encode information related to skin deformation, the nature of the feedback signaling a change in friction must somehow originate from a difference in the way the skin deforms when manipulating objects of different frictions. To better characterize the origin of the underlying sensory events, we asked human participants to perform a grip-lifting task with a manipulandum equipped with an optical imaging system. This system enabled to monitor fingertip skin strains through transparent plates of glass that had different levels of friction. We observed that, following an unexpected change in friction, participants adapted their grip force within 370ms after contact with the surface. By comparing the deformation patterns when unexpectedly switching from a high to a low friction condition, we found a significant increase in skin deformation inside the contact area arising over 100ms before the motor response, during the loading phase, suggesting that local and partial deformation patterns prior to lift-off are used in the nervous system to adjust the grip force as a function of the frictional condition.</p>
Simulations scripts for: Strain localization patterns and thrust propagation in 3-D discrete element method (DEM) models of accretionary wedges
<p>High-resolution three-dimensional discrete element method (DEM) simulations of sandbox-scale models of accretionary wedges performed in this study suggest thrusts follow a variety of propagation processes and orientations in the wedges depending on a number of factors including the stage of development of the wedge (precritical vs. critical), basal friction, and type of thrust (forward vs. backward-vergent). In terms of propagation processes, two clear mechanisms are identified. The first involves propagation from the decollement to the wedge top, similar to the standard model of thrust propagation seen in many kinematic models, and in the second, thrusts grow downward from an initial nucleation point just below the top surface of the wedge as well as upward from the decollement joining in the middle. In terms of orientation, forward-vergent thrusts initially form at Roscoe or Arthur orientations, and over shortening, form at Coulomb orientations. To arrive at these results, a wide array of continuum parameters and fields were extracted from the granular assembly of the DEM simulations, including stress, strain, strain rate, kinetic energy, Mohr-Coulomb parameters, and proximity to yielding using the Drucker-Prager criterion to visualize thrust nucleation and propagation. Lastly, the advantages and disadvantages of these continuum proxies for discerning failure in the granular assembly are considered, and the spatial and temporal relationship between proximity to yielding and strain localization (both pre-peak and persistent shear banding) in the granular model of an accretionary wedge is explored.</p>
Fast grip force adaptation to friction relies on localized fingerpad strains
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Simulations scripts for: Strain localization patterns and thrust propagation in 3-D discrete element method (DEM) models of accretionary wedges
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Data from: Application of wMelPop Wolbachia strain to crash local populations of Aedes aegypti
The endosymbiotic bacteria Wolbachia pipientis (wMel strain) has been successfully established in several populations of Aedes aegypti, the primary dengue vector. The virulent Wolbachia strain wMelPop is known to cause several pathological impacts (increased egg mortality, life shortening, etc.) reducing overall fitness in the mosquito Ae. aegypti. Increased egg mortality could substantially reduce egg banks in areas with a lengthy monsoonal dry season, and be employed to eliminate local populations. We tested this application under semi-field cage conditions. First, we determined that wMelPop infection significantly reduced the survival of desiccation-resistant eggs of the dengue vector Ae. aegypti, with shade and temperature having a significant impact; nearly all wMelPop-infected eggs failed to hatch after 6 and 10 weeks in summer and winter conditions, respectively. In laboratory selection experiments we found that egg desiccation resistance can be increased by selection, and that this effect of wMelPop infection is due to the nuclear background of the host rather than Wolbachia. We then conducted an invasion of wMelPop within a semi-field cage using sustained weekly releases of wMelPop infected mosquitoes, with fixation achieved after 9 weeks. The egg populations wMelPop infected and an uninfected control were then subjected to a simulated prolonged monsoonal dry season (2.5 months) before flooding to induce hatching. The wMelPop infected eggs suffered significantly greater mortality than the controls, with only 0.67% and 4.35% of respective infected and uninfected eggs held in 99% shade hatching after 80 days. These studies suggest that wMelPop could be used to locally eliminate populations of Ae. aegypti that are exposed to prolonged dry conditions, particularly if combined with vector control.
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