Mechanism analysis and improved model for stick-slip friction behavior considering stress distribution variation of interface

Friction between the tow and tool surface normally happens during the tow production, fabric weaving, and application process and has an important influence on the quality of the woven fabric. Based on this fact, this paper studied the influence of tension and relative velocity on the three kinds of untwisted-glass-fiber tow-on-roller friction with a Capstan-based test setup. Furthermore, an improved nonlinear friction model taking both tension and velocity into account was proposed. According to statistical test results, firstly, the friction coefficient was found to be positively correlated with tension and relative velocity. Secondly, tension and velocity were complementary on the tow-on-roller friction behavior, with neither being superior to the other. Thirdly, an improved model was found to present well the nonlinear characteristics between friction coefficient and tension and velocity, and predicational results of the model were found to agree well with the observations from Capstan tests.

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Frictional Behavior of Textile Fabrics Part I: Sliding Phenomena of Fabrics on Metallic and Polymeric Solid Surfaces

Textile Research Journal ◽

10.1177/004051759706701103 ◽

1997 ◽

Vol 67 (11) ◽

pp. 793-802 ◽

Cited By ~ 20

Author(s):

Luis Virto ◽

Arun Naik

Keyword(s):

Sliding Friction ◽

Solid Material ◽

Solid Surfaces ◽

Friction Behavior ◽

Stick Slip ◽

Compression Load ◽

Physical Description ◽

Frictional Behavior ◽

Textile Fabrics ◽

Polymeric Solid

This paper presents experimental results on the sliding of fabrics on metallic and polymeric solid surfaces, showing the influence of the compression load at the solid-fabric interface and the nature of the solid material, and the effect of sliding speed on the sliding friction coefficient. At the same time, a physical description of the sliding phenomenon is given. On the basis of these observations, a theoretical approach is developed to explain the sliding friction behavior of fabrics on solid surfaces. Part II will deal with the waving and stick-slip phenomena, which are evident in the sliding process under certain conditions.

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Low friction states for thin solid lubricant film of MoS2

Industrial Lubrication and Tribology ◽

10.1108/ilt-12-2016-0323 ◽

2018 ◽

Vol 70 (4) ◽

pp. 639-644 ◽

Cited By ~ 2

Author(s):

Kwang-Hua R. Chu

Keyword(s):

Thin Films ◽

Solid Lubricant ◽

Activation Volume ◽

High Vacuum ◽

Low Friction ◽

Friction Behavior ◽

Stick Slip ◽

Content Type ◽

Term Operation

Purpose During the operation of Wendelstein 7-X (W7-X), any mechanical disturbance such as stick-slip may cause quenching of superconducting (SC) coils. The friction behavior of MoS2 lubrication (thin film) for narrow support elements between the SC coils in W7-X is rather important, as there is a design requirement for a coefficient of friction (COF) 0.05 between the sliding surfaces to control the stress contribution (from friction). Design/methodology/approach The author has carried out intensive calibrations or verifications using verified models considering previous friction tests on various samples which measured the COF in 4.2 K, 77 K and room temperature conditions (at high vacuum) to simulate the actual working condition. Findings The author has given useful explanations and diagnosis for previous anomalous scattered data. To improve the performance of MoS2, the author has predicted its better COF (0.002 via tuning of the activation volume), which could be a superlubricating state for MoS2 thin films considering the long-term operation requirement W7-X. Originality/value In this paper, the author has adopted Eyring’s approach to predict the low COF (0.002 via tuning of the activation volume), which could be a superlubricating state for MoS2 thin films considering the long-term operation requirement W7-X. Finally, some recent progresses about the possible few-layer MoS2 role in the electromagnetic loads have been provided.

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Characteristics of Magneto-Rheological Elastomer under Stick-Slip Condition

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.842.193 ◽

2020 ◽

Vol 842 ◽

pp. 193-198

Author(s):

Kwang Hee Lee ◽

Chul Hee Lee

Keyword(s):

Magnetic Field ◽

Glass Plate ◽

Static Friction ◽

Low Noise ◽

Friction Behavior ◽

Stick Slip ◽

The Difference ◽

Magneto Rheological ◽

Squeal Noise ◽

The Magnetic Field

This paper examines the characteristics of stick-slip phenomena between the glass plate and Magneto-Rheological Elastomer (MRE) surface. Stick-slip phenomena are the spontaneous jerking motion that occurs while two objects are sliding over each other, usually accompanied by noise. Stick-slip is generated when it involves discontinuous frictional degradation when moving from static friction to dynamic friction. The phenomena can lead to uneven wear patterns, vibration and squeal noise which cause a shorter lifespan for the corresponding mechanical elements. MREs are kind of function materials to consist of a polymeric matrix with embedded ferromagnetic particles. Mechanical properties of the MREs can be controlled by the application of magnetic fields. The magnetic field-based controllability can be applied to the control of stick-slip phenomena. The friction experiment is conducted with the Reciprocating Friction Tester (RFT). The sliding speed of the RFT should be in low-speed conditions in order to make the stick-slips relatively easy to occur. A uniform magnetic field and a weight load are applied to the MRE sample to observe the effect of various experimental parameters on the movement of the stick-slip. In addition, frictional sounds due to the stick-slip phenomenon under different loads and magnetic field strength are measured and analyzed. The results of this experiment show that as the strength of the magnetic field increases, the difference in stiffness between the wipers-glass decreases, mitigating fricatives. The result is expected to be well applied to low-noise automotive wipers based on the controllability of friction behavior and squeal noise.

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Lateral Friction Behavior of a Thin, Tensioned Tape Wrapped Over a Grooved Roller: Experiments and Theory

Journal of Tribology ◽

10.1115/1.4033566 ◽

2016 ◽

Vol 139 (2) ◽

Cited By ~ 1

Author(s):

Hankang Yang ◽

Johan B. C. Engelen ◽

Walter Häberle ◽

Mark A. Lantz ◽

Sinan Müftü

Keyword(s):

Friction Coefficient ◽

Axial Direction ◽

Friction Behavior ◽

Stick Slip ◽

Friction Forces ◽

Lateral Dynamics ◽

Lateral Tape Motion ◽

Complex Interactions ◽

Recording Tape ◽

Effective Friction

Effects of friction forces on the lateral dynamics of a magnetic recording tape, wrapped around a grooved roller are investigated experimentally and theoretically. Tape is modeled as a viscoelastic, tensioned beam subjected to belt-wrap pressure and friction forces. Including the effects of stick and slip and velocity dependence of the friction force render the tape's equation of motion nonlinear. In the experiments, tape was wrapped under tension around a grooved roller in a customized tape path. The tape running speed along the axial direction was set to zero, thus only the lateral effects were studied. The grooved roller was attached to an actuator, which moved the roller across the tape. Tests were performed in slow and fast actuation modes. The slow mode was used to identify an effective static, or breakaway, friction coefficient. In the fast mode, the roller was actuated with a 50 Hz sinusoid. The same effective friction coefficient was deduced from the fast actuation mode tests. This test mode also revealed a periodic stick–slip phenomenon. The stick-to-slip and slip-to-stick transitions occurred when the tape vibration speed matched the roller actuation speed. Both experiments and theory show that upon slip, tape vibrates primarily at its natural frequency, and vibrations are attenuated relatively fast due to frictional and internal damping. This work also shows that an effective friction coefficient can be described that captures the complex interactions in lateral tape motion (LTM) over a grooved roller.

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Einfluss einer Reibhysterese auf selbsterregte Schwingungen von Partikel-Festkörper-Systemen

Tribologie und Schmierungstechnik ◽

10.24053/tus-2021-0020 ◽

2021 ◽

Vol 68 (3-4) ◽

pp. 50-57

Author(s):

Thomas Fürstner ◽

Matthias Kröger

Keyword(s):

Numerical Model ◽

Time Dependent ◽

Smooth Transition ◽

Test Rig ◽

Friction Behavior ◽

Stick Slip ◽

Dependent Behavior ◽

Average System ◽

Pmma Particles ◽

Solid System

The influence of a friction hysteresis on the self-exciting in a particle-solid-system will be investigated by experiments and a numerical model. For this, a test rig will be presented. This test rig allows to measure the actual acting friction force. Furthermore, a numerical model will be presented which has a differentiation between a time-dependent friction behavior in sliding and sticking. Bigger differences can be observed in the system behavior – even with a quality similar curve of the measured friction hysteresis. For example, in a system with PVC-W particles exists a sharp boundary between an area of stable stick-slip oscillation and an area of subsiding oscillation. In comparison to this, a system with PMMA particles has a smooth transition region between these two areas. The followed simulation studies shown, that the selfexciting mechanism is a complex interaction between the time-dependent behavior during the sliding and sticking and the external average system velocity.

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Friction behavior of waxy oil deposit removal using polymeric bristled brushes

Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology ◽

10.1177/1350650117744125 ◽

2017 ◽

Vol 232 (10) ◽

pp. 1230-1239

Author(s):

Hang Zhang ◽

Zhicheng Lan ◽

Shuhai Liu ◽

Huaping Xiao

Keyword(s):

Friction Behavior ◽

Stick Slip ◽

Friction Forces ◽

Waxy Oil ◽

Removal Experiments ◽

Three Stages ◽

Removal Processes ◽

Wax Deposits ◽

Slip Phenomenon ◽

Deposit Removal

Pigging is the most effective and common way to remove the wax deposits in pipelines. The discs, cups, or brushes of a pig are executing components for waxy oil deposit removal. In this study, a homemade experiment setup was built and employed to conduct the waxy oil deposit removal experiments with various wax concentration at different scraping speeds using polymeric bristled brushes. An explanation model was established to analyze the formation of waxy oil deposit chips. The entire removal processes were captured and the resistant friction forces were measured during the experiments. Our results show that there are three stages in the scraping process: (a) brush deforming; (b) steady scraping; (c) brush leaving; In the scraping stage, the frictional resistant force was found to decrease as the scraping speed increases. The frictional resistant force increases as the wax concentration increases. There is obvious stick-slip phenomenon in the steady scraping process. The wax concentration influences the shape of the chips. The shape of the high wax concentration deposit chips is saw-toothed.

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Contact Friction Regulation of the UV Laser Textured PVA Hydrogel and Titanium Alloy Interface

10.21203/rs.3.rs-771445/v1 ◽

2021 ◽

Author(s):

Xiaopeng Zhou ◽

Zihao Liu ◽

Xiaowei Zhu ◽

Yan Cai ◽

Jie Chen ◽

...

Keyword(s):

Titanium Alloy ◽

Sliding Friction ◽

Laser Energy ◽

Contact Friction ◽

Frictional Stress ◽

Textured Surface ◽

Velocity Range ◽

Friction Behavior ◽

Stick Slip ◽

Pva Hydrogel

Abstract The soft, hydrophilic and smooth surface of hydrogel displays extremely complex friction behavior. In this work, the ultraviolet laser post-processing created PVA hydrogel surface textures is found to be a one-step effective way for the contact friction regulation at the hydrogel-titanium alloy interface. Micro-grooves with various spacings and depths are fabricated by adjusting the laser scanline interval, laser energy density and the scanning times. Friction torques are measured by a strain-controlled parallel-plate rheometer to characterize frictional behaviors of micro-grooves. At the sliding velocity range of 0.085mm/s < v < 2.3mm/s, the effect of interlocking and ploughing force are the dominant origins of friction. Frictional stress increases with the decrease of the micro-groove spacing, but not with the increase of the micro-groove depth, which indicates that frictional stress doesn’t simply increase with an increase of hydrogel’s roughness. As the velocity increases from 2.3mm/s to 100mm/s, the surface wettability of textured hydrogel plays an important role in regulating friction. Both smooth hydrogel and laser textured hydrogels show stick-slip phenomenon which occurs in the same velocity range. These results take us a step closer to deriving a more effective, accurate, and dependable guideline for designing laser-textured surface grooves for sliding friction control of hydrogel applications.

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The Effect of Temperature on the Stick-Slip Friction Behavior of Optical Glasses in Precision Glass Molding

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.307.381 ◽

2013 ◽

Vol 307 ◽

pp. 381-386 ◽

Cited By ~ 1

Author(s):

Peiman Mosaddegh ◽

John Ziegert

Keyword(s):

Glass Transition ◽

Transition Temperature ◽

Glass Transition Temperature ◽

Elevated Temperatures ◽

Oxide Glass ◽

Friction Behavior ◽

Stick Slip ◽

Glass Molding ◽

Frictional Behavior ◽

Precision Glass Molding

Understanding the frictional behavior between glass and metals at elevated temperatures is necessary for accurate modeling and simulation of the precision glass molding (PGM) process, and can help in determining the required geometry of molds, inserts, and dies to produce various optical components. In this research, the frictional behavior of N-BK7, an oxide glass, at elevated temperatures in contact with plain steel has been studied. The results show two important phenomena related to temperature. First, the stick-slip phenomenon is more pronounced at higher temperatures close to the glass transition temperature. This is expected since relaxation and creep of glass occur by molecular diffusion, which becomes more rapid as temperature increases. Second, when the temperature is above the glass transition temperature and the glass begins to behave viscoelastically, the stick-slip friction behavior shows an exponential increase in friction force prior to the onset of sliding that is characterized by a jump in the position data on the order of several micrometers, and is consistent with the response of a viscoelastic material to applied load.

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Friction Characteristics of the Curved Sidewall Surfaces of a Rotary MEMS Device in Oscillating Motion

STLE/ASME 2008 International Joint Tribology Conference ◽

10.1115/ijtc2008-71189 ◽

2008 ◽

Author(s):

Jie Wu ◽

Shao Wang ◽

Jianmin Miao

Keyword(s):

Normal Load ◽

Contact Point ◽

Single Crystal Silicon ◽

Static Friction ◽

Nonlinear Dependence ◽

Friction Behavior ◽

Crystal Silicon ◽

Stick Slip ◽

Friction Testing ◽

Mems Device

A MEMS device with a configuration similar to that of a micro-bearing was developed to study the friction behavior of the curved sidewall surfaces. This friction testing device consists of two sets of actuators for normal motion and rotation, respectively. Friction measurements were performed at the curved sidewall surfaces of single-crystal silicon. A general model was developed for the equivalent tangential stiffness of the bush-flexure assembly at the contact point by reducing a matrix equation to a one-dimensional formulation for the purpose of using a recently developed quasi-static stick-slip model. The measurement results show that the coefficient of static friction exhibits a nonlinear dependence on the normal load. The true coefficient of static friction was determined by fitting the experimental friction curve.

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