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207 results for “friction”
A Large Fault Partially Reactivated During Two Contiguous Seismic Sequences in Central Italy: The Role of Geometrical and Frictional Heterogeneities
<p>Moment tensor catalog for events with M > 3.0, that occurred between January 2009 and April 2021, in Campotosto area, Italy. Moments tensor were calculated by applying the Time Domain Moment Tensor technique, originally proposed by Dreger and Helmberger (1993) and Pasyanos et al. (1996) and successively implemented at INGV by Scognamiglio et al. (2009).</p> <p>The catalog includes:</p> <p>Location of events: time, depth, lat and lon</p> <p>The moment magnitude: Mw</p> <p>The double-couple value: DC</p> <p>The Variance Reduction value: VR</p> <p>The six moment tensor components: Mxx, Mxy, Mxz, Myy, Myz, Mzz</p> <p>The orientation of nodal planes: strike1, dip1, rake1, strike2, dip2, rake2</p> <p> </p>
Cell Monolayer Friction Data 1
<p>In this work an improved test bed to simulate tissue including an endothelial cell (HUVEC) monolayer was developed and tested in a sliding friction test using different probe materials.</p>
Cell Monolayer Friction Data 2
<p>In this work an improved test bed to simulate tissue including an endothelial cell (HUVEC) monolayer was developed and tested in a sliding friction test using different probe materials.</p>
Wear topography measurements: selected polymers after friction tests with steel – lubrication with ionic liquids containing CNTs
<p>Measurement files of the topography of worn surfaces of polymers cooperating with steel and lubricated with hybrids of ionic liquids and carbon nanotubes. The files correspond to the tests presented in:</p> <p><span>Tribological tests - block-on-ring - polymers vs. AISI 4130 - IL+CNTs, IL+Cu_CNTs https://doi.org/10.5281/zenodo.10817199. </span></p>
Data from "Toward vanishing droplet friction on repellent surfaces"
<p>Data, examples of raw experimental movies, and MATLAB codes from "Toward vanishing droplet friction on repellent surfaces", Backholm et al. PNAS (2024). Please see the README files for all details about the files. The datasets needed to plot Figs. 1C, 2C, 3C, 4F, 4G, 5A, 5D, and 5E of the article are published in the SI file of the PNAS paper.</p>
Data for "Friction in Rolling a Cylinder on or Under a Viscoelastic Substrate with Adhesion"
<p>This dataset contains all the data generated for the publication</p> <p>[1] R. Nazari, A. Papangelo, M. Ciavarella, Friction in Rolling a Cylinder on or Under a Viscoelastic Substrate with Adhesion, Tribology Letters, (2024), DOI: 10.1007/s11249-024-01849-1 </p> <p>The provided data are those which appear in the figures of Ref. [1]. Data are stored using informative named structures in a ".mat" file. The data are easily accessible through the Commercial Software MATLAB (© 1994-2023 The MathWorks, Inc.) or by using the free software GNU Octave. An exemplary code for loading and plotting the data contained in "dataRolling.mat" is the following:</p> <p>%%%%%%%%%%%%%</p> <div>clc</div> <div>clearvars</div> <div> </div> <div>close all</div> <div> </div> <div>% load workspace containing data</div> <div> <div>load('dataRolling.mat') </div> <div> </div> <div>% Plot the curve number 2 of Figure 7</div> <div> </div> <div>figure, hold on</div> <div>curve_number = 2;</div> <div>plot(Fig7.x(curve_number).x,Fig7.y(curve_number).y)</div> <div> </div> <div>%%%%%%%%%%%%%</div> </div>
Velocity and temperature dependence of steady-state friction of natural gouge controlled by competing healing mechanisms
<p>The empirical rate- and state-dependent friction law is widely used to explain the frictional resistance of rocks. However, the constitutive parameters vary with temperature and sliding velocity, preventing extrapolation of laboratory results to natural conditions. Here, we explain the frictional properties of natural gouge from the San Andreas Fault, Alpine Fault, and the Nankai Trough from room temperature to $\sim300^\circ$C for a wide range of slip-rates with constant constitutive parameters by invoking the competition between two healing mechanisms with different thermodynamic properties. A transition from velocity-strengthening to velocity-weakening at steady-state can be attained either by decreasing the slip-rate or by increasing temperature. Our study provides a framework to understand the physics underlying the slip-rate and state dependence of friction and the dependence of frictional properties on ambient physical conditions. </p>
Not all Heterogeneity is Equal: Length Scale of Frictional Property Variation as a control on Subduction Megathrust Sliding Behavior
<p>The folder SSS_Results.zip contains the following files:</p> <p>1) A .txt for each simulation that contains (1st column) simulated timestep in seconds; (2nd column) maximum slip velocity at each timestep in m/s; and (3rd column) maximum slip velocity taken from the center of the velocity-strengthening blocks in m/s at each time step.</p> <p>2) A .mat file for each simulation that contains the same output as the .txt file, and in addition a MATLAB structure 'p' that serves as an input file to run each simulation using RSFaultZ, found at <a href="https://github.com/rmskarbek/RSFaultZ">https://github.com/rmskarbek/RSFaultZ</a></p> <p>3) PartialStabilityData.mat - results from linear stability analysis.</p> <p>4) ReducedArchiveData.m, SSS_Fig3.m, SSS_Fig4.m - Three MATLAB scripts that will automatically generate figures 3 and 4 in the related paper. </p> <p>NOTE: SSS_Fig3.m uses a perceptually uniform color map that requires an additional MATLAB package: <a href="https://www.mathworks.com/matlabcentral/fileexchange/68546-crameri-perceptually-uniform-scientific-colormaps">https://www.mathworks.com/matlabcentral/fileexchange/68546-crameri-perceptually-uniform-scientific-colormaps</a></p> <p>For any additional information please do not hesitate to contact the corresponding author Rob Skarbek at rskarbek@psi.edu.</p> <p>Additional MATLAB scripts that will reproduce the simulations themselves can be found at <a href="https://github.com/rmskarbek/RSFaultZ/tree/main/examples/blocks">https://github.com/rmskarbek/RSFaultZ/tree/main/examples/blocks</a></p>
Evidence of an internal model of friction when controlling kinetic energy at impact to slide an object along a surface toward a target
<p>This repository contains zip files for data (Data.zip) and Matlab functions library (Library.zip), and the Matlab script (Matlab_Script_for_Cumputed_data.m) used in the Famié et al PLOSONE study. In addition, the <em>README FIRST MATLAB program.pdf</em> file explains the Matlab code and data organization. </p>
Dataset for "The paucity of supershear earthquakes on large faults governed by rate and state friction"
<p>This is the dataset for the preprint "The paucity of supershear earthquakes on large faults governed by rate and state friction" including the source code and all the input files used for generating the numerical results.</p>
Source molecular simulation data for calculating energy and friction profiles and permeability coefficients through model lipid membranes
<p>Energy files from GROMACS molecular dynamics simulations with enhanced free energy sampling contain time-dependent evolution of the free energy profiles and friction profiles (and other energies and simulation properties) that were used for calculating permeability coefficients in the publication https://www.biorxiv.org/content/10.1101/2021.07.16.452599v1</p> <p>Simulation system contains a lipid POPC or DPPC bilayer with a varying amount of cholesterol (specified as mol% in the file name). Hydrophobic level of the permeating particle is specified as "level-I", "level-II" etc. When unspecified in the file name, the particle is hydrophobic level "III". Lipids D-C14-PC denote PC lipids with both tails monounsaturated of length 14 carbon atoms. DOPC is equivalent to D-C18-PC. (Detailed description in the publication)</p> <p>Adaptive Weighted Histogram (AWH) method was used to sample the free energy profile of translocating small molecule through the lipid bilayer.</p> <p>GROMACS tool `gmx awh` reads the files and provides the described profiles.</p> <p>Files were generated by GROMACS `mdrun` simulation engine version 2019.3.</p> <p> </p> <p>Coarse-grained MARTINI 3.0 model was used for modeling the biomolecular interactions.</p> <p>Scripts to perform the simulations and the files with initial configurations and simulation settings are stored in a public GitHub repository depozited on Zenodo.org: <a href="https://doi.org/10.5281/zenodo.5082249">https://doi.org/10.5281/zenodo.5082249</a>.</p> <p> </p> <p>Abraham, M. J. et al. GROMACS: High performance molecular simulations through multi-level parallelism from laptops to supercomputers. SoftwareX 1–2, 19–25 (2015).</p> <p>Lindahl, V., Lidmar, J. & Hess, B. Accelerated weight histogram method for exploring free energy landscapes. J. Chem. Phys. 141, 044110 (2014).</p> <p>Souza, P. C. T. et al. Martini 3: a general purpose force field for coarse-grained molecular dynamics. Nat. Methods 18, 382–388 (2021).</p> <p>Melcr, J. Git repository with analysis scripts for MD simulations of permeability through lipid membranes. (2021) doi:<a href="https://doi.org/10.5281/zenodo.5082249">https://doi.org/10.5281/zenodo.5082249</a>.</p>
On the scale dependence in the dynamics of frictional rupture: constant fracture energy versus size-dependent breakdown work
<pre>Potential energy stored during the inter-seismic period by tectonic loading around faults is released during earthquakes as radiated energy, frictional dissipation and fracture energy. The latter is of first importance since it is expected to control the nucleation, the propagation and the arrest of the seismic rupture. On one side, the seismological fracture energy estimated for natural earthquakes (commonly called breakdown work) ranges between 1 $\mathrm{J/m^2}$ and tens of $ \mathrm{MJ/m^2} $ for the largest events, and shows a clear slip dependence. On the other side, recent experimental studies highlighted that, concerning rupture experiments, fracture energy is a material property (energy required to break the fault interface) independently of the size of the event, i.e. of the seismic slip. </pre> <pre>To reconcile these contradictory observations and definitions, we performed stick-slip experiments, as analog for earthquakes, in a bi-axial shear configuration. We estimated fracture energy through both Linear Elastic Fracture Mechanics (LEFM) and a Cohesive Zone Model (CZM) and through the integration of the near-fault stress-slip evolution. We show that, at the scale of our experiments, fault weakening is divided into a near-tip weakening, corresponding to an energy of few $ \mathrm{J/m^2} $, consistent with the one estimated through LEFM and CZM, and a long-tailed weakening corresponding to a larger energy not localized at the rupture tip, increasing with slip.</pre> <pre>Through numerical simulations, we demonstrate that only near-tip weakening controls the rupture initiation and that long-tailed weakening can enhance slip during rupture propagation and allow the rupture to overcome stress heterogeneity along the fault. We conclude that the origin of the seismological estimates of breakdown work could be related to the energy dissipated in the long-tailed weakening rather than to the one dissipated near the tip.</pre>
Data from: Omnidirectional Manipulation of Microparticles on a Platform Subjected to Circular Motion Applying Dynamic Dry Friction Control
<p>Data from the paper "Omnidirectional Manipulation of Microparticles on a Platform Subjected to Circular Motion Applying Dynamic Dry Friction Control" <a href="https://doi.org/10.3390/mi13050711">https://doi.org/10.3390/mi13050711</a></p> <p>Currently used planar manipulation methods that utilize oscillating surfaces are usually based on asymmetries of time, kinematic, wave, or power types. This paper proposes a method for omnidirectional manipulation of microparticles on a platform subjected to circular motion, where the motion of the particle is achieved and controlled through the asymmetry created by dynamic friction control. The range of angles at which microparticles can be directed, and the average velocity were considered figures of merit. To determine the intrinsic parameters of the system that define the direction and velocity of the particles, a nondimensional mathematical model of the proposed method was developed, and modeling of the manipulation process was carried out. The modeling has shown that it is possible to direct the particle omnidirectionally at any angle over the full 2π range by changing the phase shift between the function governing the circular motion and the dry friction control function. The shape of the trajectory and the average velocity of the particle depend mainly on the width of the dry friction control function. An experimental investigation of omnidirectional manipulation was carried out by implementing the method of dynamic dry friction control. The experiments verified that the asymmetry created by dynamic dry friction control is technically feasible and can be applied for the omnidirectional manipulation of microparticles. The experimental results were consistent with the modeling results and qualitatively confirmed the influence of the control parameters on the motion characteristics predicted by the modeling. The study enriches the classical theories of particle motion on oscillating rigid plates, and it is relevant for the industries that implement various tasks related to assembling, handling, feeding, transporting, or manipulating microparticles.</p>
Data from: Vibrational Transportation on a Platform Subjected to Sinusoidal Displacement Cycles Employing Dry Friction Control
<p>Data from the paper "Vibrational Transportation on a Platform Subjected to Sinusoidal Displacement Cycles Employing Dry Friction Control", <a href="https://doi.org/10.3390/s21217280">https://doi.org/10.3390/s21217280</a></p> <p>Currently used vibrational transportation methods are usually based on asymmetries of geometric, kinematic, wave, or time types. This paper investigates the vibrational transportation of objects on a platform that is subjected to sinusoidal displacement cycles, employing periodic dynamic dry friction control. This manner of dry friction control creates an asymmetry, which is necessary to move the object. The theoretical investigation on functional capabilities and transportation regimes was carried out using a developed parametric mathematical model, and the control parameters that determine the transportation characteristics such as velocity and direction were defined. To test the functional capabilities of the proposed method, an experimental setup was developed, and experiments were carried out. The results of the presented research indicate that the proposed method ensures smooth control of the transportation velocity in a wide range and allows it to change the direction of motion. Moreover, the proposed method offers other new functional capabilities, such as a capability to move individual objects on the same platform in opposite directions and at different velocities at the same time by imposing different friction control parameters on different regions of the platform or on different objects. In addition, objects can be subjected to translation and rotation at the same time by imposing different friction control parameters on different regions of the platform. The presented research extends the classical theory of vibrational transportation and has a practical value for industries that operate manufacturing systems performing tasks such as handling and transportation, positioning, feeding, sorting, aligning, or assembling.</p>
Data from: Manipulation of Miniature and Microminiature Bodies on a Harmonically Oscillating Platform by Controlling Dry Friction
<p>Data from the paper "Manipulation of Miniature and Microminiature Bodies on a Harmonically Oscillating Platform by Controlling Dry Friction" <a href="https://doi.org/10.3390/mi12091087">https://doi.org/10.3390/mi12091087</a></p> <p>Currently used nonprehensile manipulation systems that are based on vibrational techniques employ temporal (vibrational) asymmetry, spatial asymmetry, or force asymmetry to provide and control a directional motion of a body. This paper presents a novel method of nonprehensile manipulation of miniature and microminiature bodies on a harmonically oscillating platform by creating a frictional asymmetry through dynamic dry friction control. To theoretically verify the feasibility of the method and to determine the control parameters that define the motion characteristics, a mathematical model was developed, and modeling was carried out. Experimental setups for miniature and microminiature bodies were developed for nonprehensile manipulation by dry friction control, and manipulation experiments were carried out to experimentally verify the feasibility of the proposed method and theoretical findings. By revealing how characteristic control parameters influence the direction and velocity, the modeling results theoretically verified the feasibility of the proposed method. The experimental investigation verified that the proposed method is technically feasible and can be applied in practice, as well as confirmed the theoretical findings that the velocity and direction of the body can be controlled by changing the parameters of the function for dynamic dry friction control. The presented research enriches the classical theories of manipulation methods on vibrating plates and platforms, as well as the presented results, are relevant for industries dealing with feeding, assembling, or manipulation of miniature and microminiature bodies.</p>
Friction Screw Press
1902, Firma Philipp Fischer Co. Duesseldorf Verwendung: Zum Kaltumformen von Metallteilen in Eisen- gießereien, Maschinenfabriken und anderen metallverar- beitenden Betrieben. Das Einschalten der Presse entstand über den Reibradantrieb, bei dem das horizontale Spindel- antriebsrad gleichzeitig eine große Schwungmasse dar- stellte und plötzliche Hubdrehbewegungen der Spindel bewirkte. Der Vorteil bestand darin, dass Pressvorgänge nur Sekundenbruchteile dauerten und hohe Pressdrücke erreicht werden konnten. So konnten ohne Arbeitsgänge wie Drehen, Bohren oder Fräsen Metallteile mit Relief oder Hohlräumen geformt werden. Nachteile derart schwerer Pressen warn der große Lärm und die Unwuchtschläge über das Fundament auf das Gebäude. Source: Objaverse 1.0 / Sketchfab
Experimental data for Understanding frictional behavior in fascia tissues through tribological modeling and material substitution
<p>Dataset (experimental data) for publication titled: Understanding frictional behavior in fascia tissues through tribological modeling and material substitution. The article deals with the development of a tribological model of fascia. As in the paper, the dataset is divided into the three phenomena studied: Effect of geometry, Models, Hyaluronic acid - model E. </p>
Extracted experimental data for research paper titled "Micro-thermomechanical Modeling of Rocks with Temperature-dependent Friction and Damage Laws"
<p>This repository contains the experimental data on stress-strain curves extracted from the following original publications for constitutive model validation in our manuscript.</p> <p>[1] Jinping marble: Zhong, Y. Y. (2017). Research on mechanical properties of marble and the effects on rock burst under thermal-mechanical coupling (in Chinese) (Master’s thesis, Chengdu University of Technology). doi: 10.26986/d.cnki.gcdlc.2017.000109.</p> <p>[2] Beibei sandstone: Long, L. J. (2021). Study on mechanical and seepage properties of sandstone under the coupling of temperature-seepage-stress (in Chinese) (Doctoral dissertation, Chongqing University). doi: 10.27670/d.cnki.gcqdu.2021.001009.</p> <p>[3] Gongjue granite: Zhou, H. Y., Liu, Z. B., Shen, W. Q., Feng, T., & Zhang, G. Z. (2022). Mechanical property and thermal degradation mechanism of granite in thermal-mechanical coupled triaxial compression. International Journal of Rock Mechanics and Mining Sciences, 160, 105270. doi: 10.1016/j.ijrmms.2022.105270.</p>
Raw data and simulation input file for friction experiment "crack28" performed at Geoazur on 2023/06/30.
Open the record for dataset details and reuse information.
Characterization of mortar-timber and timber-timber cyclic friction in timber floor connections of masonry buildings (dataset)
<p>The seismic performance of buildings depends critically on the stiffness and strength of<br> storey diaphragms. Whilst for modern reinforced concrete or steel structures the<br> connection between floors and lateral resisting members is often assumed as<br> monolithic, timber floors and ceilings in masonry buildings are susceptible to sliding in<br> their supports. In fact, the anchorage of timber beams in masonry walls and<br> intermediate supports relies partly or totally on a frictional type of resisting mechanism.<br> The present work contributes to characterize this behaviour by presenting the results of<br> an extensive experimental programme with cyclic friction triplet tests between mortar<br> and timber units, and between timber and timber units. These were produced to be<br> representative of connection typologies characteristic of pre-modern and contemporary<br> construction periods. Each test was performed under a constant level of contact<br> pressure, which was increased throughout each series to cover a range of normal<br> forces foreseeable in building connections. Other aspects are also discussed, such as<br> the influence of cumulative loading or velocity. The experimental dataset is herein made<br> available for public use.</p>
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