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207 results for “friction”
Data for "To heal or not to heal? Part I: The effect of pore fluid pressure on the frictional healing behavior of Oklahoma lithologies"
<p>This dataset includes the original data files for each experiment in csv format, the mat version with an additional friction column, the hold picks, the velocity step picks, and the RSFitting results. They have the following names:</p> <ul> <li>UC####.csv</li> <li>UC####.mat</li> <li>UC##_hold_picks.mat</li> <li>UC##_healing_picks.mat</li> <li>UC##_VS_RSFit.mat</li> </ul> <p>The CSV and mat files include the on-sample shear displacement data labeled LVDT1 and LVDT2 and the on-sample radial displacement data labeled LVDT3. All data files except for the RSFit include an OG_Index column which is consistent across files for each experiment, such that it provides a unique indicator for each datapoint. Note that all experiment numbers are available in the main text, except for UC0094, which is shown in the supplement text S6.</p>
BISICLES Pine Island Glacier simulations with linear friction
<p>Model simulations of the ice sheet model BISICLES for 100 years on a set of topographies, sampled form a GP (plus BM2 and BedMachine) with linear Weertman friction law.</p> <p>See chapter 5 of <a href="https://doi.org/10.21954/ou.ro.0001223d">https://doi.org/10.21954/ou.ro.0001223d</a> for more information</p>
BISICLES Pine Island Glacier simulations with nonlinear friction
<p>Model simulations of the ice sheet model BISICLES for 100 years on a set of topographies, sampled form a GP (plus BM2 and BedMachine) with m=1/3 Weertman friction law exponent.</p> <p>See chapter 5 of DOI: <a href="https://doi.org/10.21954/ou.ro.0001223d">https://doi.org/10.21954/ou.ro.0001223d</a> for more information</p>
The stress- and fluid-pressure-driven frictional slip data for variably roughened fractures in Gonghe granite
<p class="Abstract"><a name="_Hlk122089471"></a><span>We explore</span><span> the impacts of stress- and fluid-pressure-driven frictional slip on variably roughened fractures in Gonghe granite (Qinghai province, China). Slip is on an inclined fracture under simple triaxial stresses with concurrent fluid throughflow allowing fault permeability to be measured both pre- and post-reactivation. Under stress-drive, smooth faults are first slip-weakening and transition to slip-strengthening with rough faults slip-strengthening, alone. A friction criterion accommodating a change in friction coefficient and fault angle is able to fit the data of stable-slip and stick-slip. Under fluid-pressure-drive, excess pore pressures must be significantly larger than average pore pressures suggested by the stress-drive-derived failure criterion. This overpressure is conditioned by the heterogeneity of the pore pressure distribution in radial flow on the fault and related to the change in permeability</span><span>. Fault roughness impacts both the coefficient of friction and the permeability and therefore exerts important controls in fluid-injection-induced earthquakes.</span><span> </span><span>The results potentially improve our ability to assess and mitigate the risk of injection-induced earthquakes in EGS.</span><span> </span></p>
Influence of viscous lubricant on nucleation and propagation of frictional ruptures.
<p>Raw data used for the study of "Influence of viscous lubricant on nucleation and propagation of frictional ruptures."</p> <p>Data includes: high frequency strain gauges measurements, Acceleration measurements, Macroscopic load acquisition (load cells), and photoelasticity measurements.</p>
Frictional Properties and Healing Behavior of Tectonic Mélanges: Implications for the Evolution of Subduction Fault Zones
<p>Here, we report data from velocity-step experiments using rocks collected from ancient subduction fault zones, the Lower Mugi and Makimine mélanges of the Cretaceous Shimanto belt. The two mélanges preserve paleotemperature records corresponding to the updip and downdip limits of the seismogenic zone and deformation recording a lower versus higher degree of pressure solution. The compostions of the mélanges analyzed with X-ray diffraction (XRD) are also included in the datasets. Our data show that the Lower Mugi mélange sample exhibits velocity-weakening to velocity-neutral behavior under low normal stress, and the Makimine mélange sample shows velocity-strengthening behavior under high normal stress. This is consistent with the slip behavior observed at the depths they have been subducted to along the plate interface. We also perform a series of slide-hold-slide experiments under different hydrothermal conditions using the Lower Mugi mélange sample to evaluate the role of pressure solution in fault healing and its dependency on temperature. The results show that healing rates increase in tests operated at higher temperatures, which suggests the importance of pressure solution healing along plate interfaces.</p>
The Friction of radially loaded hybrid spindle bearings under high speeds
<p>Friction losses are an important parameter for evaluating the operational behaviour of high-speed rolling bearings. Especially in machine tool applications, the bearings are subjected to high radial loads, which lead to increased forces in the rolling contact and thus to increased bearing friction. At high speeds, hybrid spindle bearings are typically used, consisting of ceramic balls and steel raceways, which are characterised by better frictional behaviour compared to steel bearings. A precise knowledge of the friction characteristics, especially at high speeds, makes it possible to improve friction models and to extrapolate them to spindle bearings of other types and sizes, geometries and other operational conditions. In the following article, a new straight forward method to measure the frictional torque in spindle bearings is presented. A rigidly arranged hybrid spindle bearing pair of the type 7008 was tested over varying speeds and radial loads evaluated in a characteristic diagram. The influence of oil air and grease lubrication was investigated. Based on the test parameters, a current friction calculation method was presented and validated. The influence of outer race control and minimized power dissipation is discussed.</p>
Data from: Effects of temperature and obsidian content on the friction and stability of simulated basalt gouges: Implications for shallow moonquakes
<p><span>Basalt is a major component of crust on both the Earth and Moon. Mineral composition and temperature influence frictional instability and thus the potential for seismicity on basaltic faults. We performed velocity-stepping shear experiments on basalt gouges at a confining pressure of 100 MPa, temperatures in the range 100-400°C and with varied obsidian contents of 0-100 wt.% under wet/dry conditions to investigate the frictional strength and stability of basaltic faults. We observe a transition from velocity-neutral to velocity-weakening behaviors with increasing obsidian content. The frictional stability response of the mixed obsidian/basalt gouges is characterized by a transition from velocity-strengthening to velocity-weakening at 200°C and another transition to velocity-strengthening at >300°C. Conversely, frictional strengths of the obsidian-bearing gouges are insensitive to temperature and wet/dry conditions. These results suggest that obsidian content dominates the potential seismic response of basaltic faults with the effect of temperature controlling the range of seismogenic depths. These observations contribute to a better understanding of the nucleation mechanism of shallow moonquakes and also seismicity on terrestrial faults in basalt.</span></p>
Data of "Inferring the Basal Friction Law from long term observations of Glacier Length, Thickness and Velocity changes on an Alpine Glacier"
<p>This dataset contains the surface velocity and elevation of Argentière Glacier in 2003 and 2018 used in:</p> <p>Gilbert, A., Gimbert, F., Gagliardini, O., & Vincent, C. (2023). Inferring the Basal Friction Law From Long Term Changes of Glacier Length, Thickness and Velocity on an Alpine Glacier. <em>Geophysical Research Letters</em>, <em>50</em>(16), e2023GL104503. <a href="https://doi.org/10.1029/2023GL104503">https://doi.org/10.1029/2023GL104503</a></p> <p>Surface DEM files contain elevation Z on a 20X20 meter grid (geotif files, coordinnate are in Lambert 2E ( EPSG:27572 ) )</p> <p>Horizontal Velocity files contain measured horizontal velocities Vh in m/yr on a 20X20 meter grid (geotif files, coordinnate are in Lambert 2E ( EPSG:27572 ) )</p>
Simulation data for paper "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan"
<p>Supplementary files for Dubinya, Tikhotskiy paper entitled "Estimation of in-situ stresses and friction properties of rock masses based on natural fractures conductivity: a case study from C0002 well at Nankai Trough zone, offshore Shikoku Island, Japan" prepared for submission to Journal of Geophysical Research: Solid Earth.</p> <p> </p> <p>File "Initial data on fractures.csv" contains initial data on conductivity of natural fractures, their deoths and spatial orientations</p> <p>Files "Unit N, (un)limited friction" contain results of Monte-Carlo simulations completed based on data from fractures from N-th interval. Friction coefficient is varied either between 0 and 1 (unlimited friction), or 0.4 and 0.6 (limited friction).</p>
Data from: Friction and instability of glaucophane gouges at blueschist temperatures support abundance of intermediate-depth earthquakes
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Frictional properties of feldspar-chlorite altered gouges and implications for fault reactivation in hydrothermal systems
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Decadal seafloor geodesy constrains frictionally locked areas along the Nankai Trough
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Sponge-like rigid structures in frictional granular packings
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Friction data from: Directional hydration lubrication underwater: Enabled by TA/PAAm submicron particles
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Data from: Spectral wear modelling of rubber friction on a hard substrate with large surface roughness
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The stress- and fluid-pressure-driven frictional slip data for variably roughened fractures in Gonghe granite
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Ambient and nitrogen environment friction data for various materials and surface treatments for space applications
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Data from: Friction of Longmaxi shale gouges and implications for seismicity during hydraulic fracturing
<p>Longmaxi formation shales are the major target reservoir for shale gas extraction in the Sichuan Basin, southwest China. Swarms of earthquakes accompanying hydraulic fracturing are observed at depths typified by the Longmaxi formation. Mineral composition varies broadly through the stratigraphic section due to different depositional environments. The section is generally tectosilicate-poor and phyllosilicate-rich with a minor portion (~5 <i>wt</i>.%) the converse. We measure the frictional and stability properties of shale gouges taken from the full stratigraphic section at hydrothermal conditions. Velocity-stepping experiments were performed on representative shale gouges at <i>σ<sub>c</sub></i> = 60 <i>MPa</i>, <i>P<sub>f</sub></i> = 30 <i>MPa</i> and <i>T</i> =150 <i>℃</i>. Results show that the gouges are generally frictionally strong with friction coefficients spanning a range of 0.50-0.75. Two phyllosilicate+TOC-poor gouges exhibited higher frictional strength and velocity weakening behavior, capable of potentially unstable fault slips, while only velocity strengthening behavior was observed for the remaining phyllosilicate+TOC-rich gouges. These results confirm that the frictional and stability properties are mainly controlled by phyllosilicate+TOC content. Elevating the temperature further weakens the gouges and drives it towards velocity weakening. The presence of observed seismicity in majority velocity strengthening materials suggest the importance of the minority velocity weakening materials. We suggest a model where seismicity is triggered when high pore fluid pressures drive aseismic slip in the near-field and triggers seismic slip on adjacent faults. Our results have important implications in understanding the physics of earthquakes in Sichuan Basin and highlights the importance of identifying the location and characteristics of faults prior to hydraulic fracturing.</p>
Rotary Friction Welding of short raws
<p>This video shows a dissimilar rotary friction weld of a titanium tube with an aluminum tube.</p> <p>This project has received funding from the Clean Sky 2 Joint Undertaking under the European Union’s Horizon 2020 research and innovation programme under grant agreement No 785289.</p>
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