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Articoli di riviste sul tema "Friction"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Evans, Philip. "Friction on Frictions." Physiotherapy 78, no. 12 (1992): 930. http://dx.doi.org/10.1016/s0031-9406(10)60511-1.

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2

Zhu, Zongxiao, Hui Wang, Zixuan Qiang, et al. "Molecular Dynamics Study on Nano-Friction and Wear Mechanism of Nickel-Based Polycrystalline Superalloy Coating." Coatings 11, no. 8 (2021): 896. http://dx.doi.org/10.3390/coatings11080896.

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In this work, molecular dynamics simulations are employed to study the nanotribological process of nickel-based polycrystalline superalloy coating. A series of simulations were carried out using the method of repeated friction to explore the influence of frictional force, friction coefficient, grinding groove morphology, wear scar depth, debris flow direction, subsurface damage degree and evolution of defects during the nano-friction process. In addition, the change mechanism of different grain sizes on wear scar depth, frictional force, friction coefficient, and internal damage in the repeate

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3

Atirek, Gaur, Nanda Saswati, and Kumar Duchaniya Rajendra. "Tribological Effects of Graphene Oxide on Brake Friction Materials." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 5 (2020): 414–16. https://doi.org/10.35940/ijeat.E9417.069520.

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Many times in past Brake friction composites and their various combinations have been filled with graphene oxide made-up and tested many times for their tribological performance. Various changes in tribological behavior of testing materials of the frictional composites have been tested and evaluated on the setup of krauss testing machine During these testing’s a high amount of enhancement in the friction performance (μP), frictions fade (μF) and friction recovery (μR) were found with the proper addition of graphene oxide in various amounts. The changes and the decrement in the w

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4

Li, Jing-Ming, Hai-Jun Wei, Li-Dui Wei, Da-Ping Zhou, and Ye Qiu. "Extraction of Frictional Vibration Features with Multifractal Detrended Fluctuation Analysis and Friction State Recognition." Symmetry 12, no. 2 (2020): 272. http://dx.doi.org/10.3390/sym12020272.

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For the purpose of extracting the frictional vibration characteristics of the friction pair during friction and wear in different friction states, the friction and wear tests of friction pair in different friction states were conducted on a testing machine. Higher-dimensional fractal and multifractal characteristics hidden in time series can be examined by multifractal detrended fluctuation analysis (MFDFA) method. The frictional vibration time-domain signals, the friction coefficient signals and the frictional vibration frequency-domain signals were analyzed and multifractal spectra were acqu

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5

Qiao, Yu Lin, Shan Lin Yang, Yan Zang, and Xin Yu Dong. "Effects of Ultrasonic Vibration on Tribological Properties of GCr15/45^# Steel Frictional Pairs in Lubricated Sliding Conditions under Various Friction Speed." Advanced Materials Research 338 (September 2011): 599–602. http://dx.doi.org/10.4028/www.scientific.net/amr.338.599.

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The effects of friction speed and ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of frictional pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples. When the friction f

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6

Fang, Kun. "Frictional Performance of Polyphenyl Ester Modified Polytetrafluoroethylene." Materials Science Forum 1080 (January 30, 2023): 33–39. http://dx.doi.org/10.4028/p-g7gf9i.

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This paper mainly studied the coefficient of friction (COF), wear performance and frictional vibration performance of polyphenyl ester modified polytetrafluoroethylene under dry friction and water lubrication friction conditions. Polyphenyl ester modified polytetrafluoroethylene composites were prepared by blending 20% polyphenyl ester with polytetrafluoroethylene, and the COF, wear performance and frictional vibration properties of such composites were tested. The results showed that: (1) Under dry friction conditions, as the specific pressure between the friction pairs increased, the volume

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7

Wang, Tian Guo, X. Y. Liu, and J. J. Hua. "Investigation on the Fabrication and Properties of the Cu Base Friction Composites." Materials Science Forum 984 (April 2020): 125–30. http://dx.doi.org/10.4028/www.scientific.net/msf.984.125.

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Cu-based friction materials were prepared by powder metallurgy technology. The effect of Fe content on friction and wear properties of Cu-based friction materials has been investigated. The results indicate that Fe content has great effects on the wear ability of Cu-based friction materials. Fe works as frictional component in copper-based friction materials, influening the mechanical and frictional property of materials. With increasing Fe content, the hardness and friction coefficient of Cu-based friction materials stability increase, the wear rate of the friction materials decreases. When F

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8

Zhang, Zijian, Guangwu Zhou, Peng Li, Luole Du, and Min He. "Research on the Vibration Behavior of Ring–Block Friction Pair Made of Materials of Water-Lubricated Rubber Bearing under Special Operating Conditions." Applied Sciences 13, no. 13 (2023): 7676. http://dx.doi.org/10.3390/app13137676.

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A water-lubricated rubber bearing (WLRB) is prone to generate frictional vibration noise under special operating conditions, which seriously affects the acoustic stealth performance of warships and threatens their navigation safety. Meanwhile, the main factor affecting the frictional vibration behavior of a WLRB is the materials of the friction pair. Therefore, this work selects a friction pair composed of a copper ring and a rubber block as the research object and studies the frictional vibration behavior of the ring–block friction pair under low-speed and starting conditions. The real fricti

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9

Fang, Shanglong, Wei Xiao, Kewen Chen, and Xuding Song. "Research on the Model for the Friction Coefficient of Resin-Based Friction Material and Its Experimental Verification." Materials 16, no. 13 (2023): 4791. http://dx.doi.org/10.3390/ma16134791.

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Resin-based friction materials have been widely used in the friction braking of automobiles and power machinery. Based on experiments for the variation law of friction and wear morphology, a new model for the friction coefficient of resin-based friction materials was proposed, which includes the effects of both the micro convex body on the surface of the friction material and the frictional film generated during the friction process. This quantitative model of friction coefficient materials was established for the modelling of shear strength, compressive strength, shear strength of the frictio

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10

ANDERSON, KEN, and MARIA CURY. "Friction into Traction: A Case Study of Frictions in Strategic Ethnography." Ethnographic Praxis in Industry Conference Proceedings 2023, no. 1 (2023): 346–68. https://doi.org/10.1111/epic.12173.

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This case study highlights the transformative power of strategic ethnography in shaping frameworks that gain traction within organizations, facilitated by three frictions: research friction, analysis friction, and path‐to‐action friction. By embracing frictions as productive movements, we not only witnessed the profound impact of ethnographic research on the future of a product category but also experienced the convergence of previously competing divisions, fostering innovation, collaboration, and organizational growth. Through an analysis of these frictions, we distill lessons for applied eth

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11

Khan, Saifullah, Adnan Shoaib, Rehan Aftab, Muhammad Yasir, and Muhammad Bilal Saeed. "Financial frictions and stock return: A novel least minus more frictional factor for asset pricing models in emerging economies." PLOS One 20, no. 7 (2025): e0325917. https://doi.org/10.1371/journal.pone.0325917.

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The primary objective of this study is to empirically evaluate the role of various levels of financial friction in explaining stock returns through different asset pricing models. This study enhances asset pricing model estimates by incorporating diverse levels of financial friction by introducing a novel least minus more frictional asset pricing factor specifically constructed for emerging economies. The empirical analysis is conducted using data from a sample including five countries: China, India, Pakistan, Bangladesh, and Sri Lanka. Monthly data from 735 listed manufacturing firms is used

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12

Jang, Siyoul. "Manipulating Frictional Performance of Wet Clutch Engagement through Material Properties and Operating Conditions." Lubricants 10, no. 9 (2022): 225. http://dx.doi.org/10.3390/lubricants10090225.

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Wet clutch engagement is mainly influenced by the frictional behaviors between the friction pad and steel plate as well as the lubrication behaviors. A positive μ–V friction coefficient of the wet clutch pad is the most preferable characteristic for improving antishudder behavior. In this study, a wet clutch engagement mechanism is theoretically divided into two major frictional behaviors, namely, direct asperity contact of interacting surfaces and hydrodynamic lubrication, for positive μ–V friction performance. These two behaviors are investigated with regard to both material characteristics

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13

Nurhayati, Immas. "FRIKSI PERDAGANGAN DAN PENGARUHNYA TERHADAP ESTIMASI EXPECTED RETURN PADA CAPITAL ASSET PRICING MODEL DI BURSA EFEK INDONESIA." inovator 5, no. 2 (2016): 1–24. https://doi.org/10.32832/inovator.v5i2.632.

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The main purpose of this research is to measure trading friction for high frequency financial data at Bursa Efek Indonesia (BEI) and to adjust trading friction to estimate expected return in capital asset pricing model. Trading friction could be measured by quoted half spread, effective half spread, traded half spread and proportional half spread. This research defines trading friction as the difficulties faced by investors in the stocks trading which is sourced from implisit transaction cost. The sources of trading friction are real friction dan informational friction.Based on calculations, i

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14

Singh, Satyam, Vijay Kumar Singh, Pramod Kumar Mishra, et al. "Efficacy of Moisture Content on Frictional Properties of Food Grains." Journal of Scientific Research and Reports 31, no. 6 (2025): 412–21. https://doi.org/10.9734/jsrr/2025/v31i63139.

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Frictional properties are important in many problems associated with the design of machines and the analysis of the behaviour of the product during seed sowing and agricultural process operations such as handling, harvesting, threshing, cleaning and sorting etc. In the current study, average frictional properties of sample of grains were carried out at five different moisture content level 10%, 13%, 16%, 19% and 22% (w.b.). To carry out the frictional property of four grain samples are selected for the experiment wheat (Triticum aestivum), paddy (Oryza sativa), gram (Cicer arietinum) and pea (

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15

Hong, Zhipeng, Wei Hao, Liang He, Yinuo Zhang, and Zhaoyu Wen. "Analysis of Rock Friction Coefficient Characteristics Based on Friction Experimental Equipment." Rock Mechanics Letters 2, no. 2 (2025): 110–20. https://doi.org/10.70425/rml.202502.15.

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Friction coefficient, as a parameter of mechanical state, plays a crucial role in the shear failure of rocks in the field of Earth sciences. This paper investigates the frictional characteristics and anisotropy of rock by analyzing the coefficient of variation of the friction coefficient (f) and the anisotropy index of rock friction coefficients Af. Rotational friction tests were conducted using cylindrical granite against square samples of granite, sandstone, and andesite in three directions to analyze the relationship between the friction coefficient and various drilling parameters. This stu

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16

Dong, Xin Yu, Yu Lin Qiao, Yan Zang, and Qing Sheng Cui. "Effects of Friction Load and Ultrasonic Vibration on the Tribological Properties of Al₂O₃/Al₂O₃ Ceramic Friction Pairs under Liquid Paraffin Lubrication." Advanced Materials Research 652-654 (January 2013): 1881–85. http://dx.doi.org/10.4028/www.scientific.net/amr.652-654.1881.

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The effects of friction load and ultrasonic vibration on friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic frictional pairs under oil lubrication were investigated by a modified MFT-R4000 reciprocating friction and wear tester. The mechanism of friction reduction and anti-wear under ultrasonic vibration was discussed. The results showed that, the ultrasonic vibration could influence the friction reduction and anti-wear properties of Al2O3/Al2O3 ceramic friction pairs due to it could reduce the stress between the friction pairs and destroy the oil film on the surface of samples

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17

Krykhtin, Yu I., and V. I. Karlov. "HIGH-PERFORMANCE METHOD OF PRODUCTION OF POWDER FRICTIONAL PRODUCTS ON FE-BASIS WITH HIGH TECHNOLOGICAL AND OPERATIONAL PROPERTIES." IZVESTIA VOLGOGRAD STATE TECHNICAL UNIVERSITY, no. 2(249) (February 25, 2021): 20–26. http://dx.doi.org/10.35211/1990-5297-2021-2-249-20-26.

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Physical and technological bases of DHP-PFM method for production of dry friction powder friction articles on Fe-base with high technological and operational indices for a wide range of practical use have been developed. The DHP-PFM method is that the dynamic hot pressing (DHP) provides production of the new powder frictional materials (PFM) through an underlayer from carbonyl iron between frictional material and a basis (framework) with electroplated nickel coating. Friction lining compaction is made of charge of ФМК-79 type and has high hardness and low porosity. Processes of the choice of c

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18

Manandhar, Suman, Noriyuki Yasufuku, Kiyoshi Omine, and Taizo Kobayashi. "Response of tapered piles in cohesionless soil based on model tests." Journal of Nepal Geological Society 40 (December 1, 2010): 85–92. http://dx.doi.org/10.3126/jngs.v40i0.23613.

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This paper describes model tests of different types of tapered piles in cohesionless soils. Chromium plated three steel piles, one straight and two taper-shaped piles of same length and pile tip diameters have been executed for pile loading test in a downward frictional mode. Two different types of model grounds have been prepared for the test. Relative densities of 80 % and 60 % have been modeled to penetrate piles in two different types of sands to observe the effectiveness of skin frictions of different types of piles. The response of tapered piles has shown that the skin friction has incre

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19

Luo, Shenq Yih, and Can Yu Bai. "Study of Metal Friction Materials Using Hot Press." Advanced Materials Research 750-752 (August 2013): 2084–87. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.2084.

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The metal friction materials of copper matrix with and without resin using hot press were investigated to study their hardness, porosities, bending strengths, microstructures, coefficient of frictions, and wear mechanisms. The experiment results show that the hardness and bending strength of the friction materials with increase of amount of copper increase, but the porosity decreases. The resulting coefficient of frictions show more stable and their values are about 0.5~0.6. In addition, the wear mechanism of friction material shows mainly grit abrasive and adhesion, which cause the coefficien

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20

Bates, Jo. "The politics of data friction." Journal of Documentation 74, no. 2 (2018): 412–29. http://dx.doi.org/10.1108/jd-05-2017-0080.

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Purpose The purpose of this paper is twofold: first, to further develop Paul Edwards’ concept of “data friction” by examining the socio-material forces that are shaping data movements in the cases of research data and online communications data, second, to articulate a politics of data friction, identifying the interrelated infrastructural, socio-cultural and regulatory dynamics of data friction, and how these are contributing to the constitution of social relations. Design/methodology/approach The paper develops a hermeneutic review of the literature on socio-material factors influencing the

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21

Hosseinali, Farzad, and J. Thomasson. "Multiscale Frictional Properties of Cotton Fibers: A Review." Fibers 6, no. 3 (2018): 49. http://dx.doi.org/10.3390/fib6030049.

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This review discusses the important concept of cotton fiber friction at both the macro- and nanoscale. First, the technological importance of fiber friction and its role in fiber breakage during fiber processing is discussed. Next, previous studies on frictional properties of cotton fibers are reviewed and different experimental procedures to measure friction between fibers or against another surface are evaluated. Friction models developed to explain friction process during various experimental procedures are considered and their limitations are discussed. Since interpretation of friction pro

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22

Al-Karkhi, Nazar, Nadica Stojanovic, Salah Al-Zubaidi, et al. "Experimental Investigation of Thermal Effect on the Frictional Characteristics of HCC Friction Clutch Material." Tribology in Industry 46, no. 1 (2024): 141–50. http://dx.doi.org/10.24874/ti.1465.03.23.12.

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Increasing temperature due to frictional heat from sliding between contacting surfaces leads to increased wear and friction. Therefore, the researchers continue investigations to find the most suitable friction materials with good mechanical and thermal properties for frictional facings of clutch performance under this condition. In this research paper, the behavior and performance of the friction material HCC was studied under different normal load conditions (125, 175, 225, and 275 N) and different working environment temperatures (300 K and 390 K), where the rotation speed was 300 rpm. The

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23

Rajapakshe, M. P., M. Gunaratne, and A. K. Kaw. "Evaluation of LuGre Tire Friction Model with Measured Data on Multiple Pavement Surfaces." Tire Science and Technology 38, no. 3 (2010): 213–27. http://dx.doi.org/10.2346/1.3481671.

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Abstract Accurate modeling of tire/pavement friction phenomena is of utmost importance in many applications such as vehicle braking control and frictional evaluation of pavements. LuGre tire friction model is a model which is used for this purpose by estimating its parameters using measured pavement friction data. In this investigation, LuGre model parameters were estimated using field data collected by a standard pavement friction measuring device (Locked Wheel Skid Trailer-ASTM E 274) at a group of pavements with different surface friction properties. Adequacy of the model to predict measure

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24

Wu, Xiangyu, and Yanzhong Wang. "Experimental investigations of tribological performances of novel friction pair with different conical configurations." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 8 (2019): 1245–55. http://dx.doi.org/10.1177/1350650119834424.

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Friction plate with conical configuration is a novel application in automatic transmission. In order to investigate the tribological performances of novel friction pair with different conical configurations, a series of tests are conducted by using a variable-speed friction test rig. The lubrication regime is evaluated by the friction coefficient curves under different loads. Test results of the friction coefficient under different rotating speeds are analyzed. The difference in the frictional behavior is analyzed for different conical friction pairs. The effects of the cone height and cone an

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25

Zhang, Zhigang, Ling Zou, Hang Liu, Yonglong Chen, and Benzhu Zhang. "Effects of operating and material parameters on the thermal characteristics of a wet clutch." Advances in Mechanical Engineering 13, no. 7 (2021): 168781402110341. http://dx.doi.org/10.1177/16878140211034101.

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Based on the frictional mechanism of a wet clutch, frictional models of wet clutch engagement were established using the modified Reynolds equation and the elastic contact model between frictional pairs. Then, the heat flux models for the viscous shear and asperity friction were built, and the two-dimensional transient thermal models for the separator plate, friction disk, and ATF heat convection model were deduced based on the heat transfer theory and conservation law of energy. Finally, the Runge–Kutta numerical method was used to solve the frictional and thermal models. The average temperat

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26

Qiao, Yu Lin, Shan Lin Yang, Yan Zang, and Dong Wang. "Effect of Ultrasonic Vibration on Friction and Wear Properties of GCr15/45# Steel Frictional Pairs under Oil Lubrication." Advanced Materials Research 295-297 (July 2011): 2102–5. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.2102.

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Ultrasonic vibration friction and wear experiments were carried out by MFT-R4000 reciprocating friction and wear tester bonded with ultrasonic device. The surface morphologies of wear scars were examined by scanning electron microscope (SEM). The influences of ultrasonic vibration on friction reduction and anti-wear properties of GCr15/45# steel frictional pairs under different loads were discussed. The experimental results showed that, the friction of GCr15/45# steel frictional pairs could be reduced by ultrasonic vibration, and the reduction of friction coefficient became more obvious as the

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Alhasan, Ahmad, Omar Smadi, Georges Bou-Saab, Nacu Hernandez, and Eric Cochran. "Pavement Friction Modeling using Texture Measurements and Pendulum Skid Tester." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 40 (2018): 440–51. http://dx.doi.org/10.1177/0361198118774165.

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Pavement frictional behavior affects pavement performance in terms of vehicle safety, fuel consumption, and tire wear. Comprehending and interpreting pavement friction measurements is a challenging task, because of friction sensitivity to several uncontrollable factors. These factors include: pavement surface conditions, such as the type and thickness of contaminants and fluids on the surface and their interaction with friction forces; and the device operating conditions, such as sliding speed, material properties and geometry of the rubber slider used, and operating temperature. Despite the e

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OLEKSOWICZ, SELIM, and ANDRZEJ MRUK. "FRICTION PROCESS IN THE PRESENCE OF HARD ABRASIVE PARTICLES — COOPERATION MODEL." Surface Review and Letters 18, no. 06 (2011): 249–59. http://dx.doi.org/10.1142/s0218625x11014734.

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The paper presents the results of the investigation performed on a stand for model testing of the friction pair like a car disc brake. The tests were performed for the mating operation of a frictional node with the dosage of hard abrasive particles into the friction zone. Based on the observation of the phenomena in the friction zone and the analysis of the parameters describing operating conditions of a frictional node, physical models of the frictional node cooperation in the presence of hard abrasive particles have been proposed. During the tests, using the transparent material of a frictio

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Ahagon, Asahiro, Toshio Kobayashi, and Makoto Mlsawa. "Friction on Ice." Rubber Chemistry and Technology 61, no. 1 (1988): 14–35. http://dx.doi.org/10.5254/1.3536173.

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Abstract The friction on ice is strongly dependent on temperature. At sufficiently low temperatures, the frictional resistance on ice is high comparable to those on wet or even dry solid surfaces. As temperature rises and approaches the melting point of ice, however, friction rapidly decreases. Differing from the friction of a rubber on ordinary dry or wet solid surfaces the energy loss processes in the rubber do not seem to be the direct source of the frictional resistance on ice. Although frictional melting of ice could occur at high sliding speeds, an ice surface is inherently lubricated wi

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Wang, Xingjuan, Xulin Si, Liguang Zhu, Tianshuo Wei, and Xuelong Zheng. "Friction Stress Analysis of Slag Film in Mold of Medium-Carbon Special Steel Square Billet." Metals 15, no. 7 (2025): 702. https://doi.org/10.3390/met15070702.

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Non-uniform friction and lubrication are the key factors affecting the surface quality of the casting billet. Based on the three-layer structure of the casting powder in the mold, the frictional stress in the mold was calculated and analyzed by using the relationship between the frictional stress and the thickness and viscosity of the liquid slag film, and the lubrication state between the cast billet and the mold was evaluated. Based on the actual production data of 40Mn2 steel and combined with the numerical simulation results of the solidification and shrinkage process of the molten steel i

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Zhang, Lijun, Wenbo Li, and Dejian Meng. "Influence of Heterogeneous Contact Stiffness and Heterogeneous Friction Coefficient on Frictional Squeal." Shock and Vibration 2018 (2018): 1–21. http://dx.doi.org/10.1155/2018/6379201.

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Contact stiffness and friction coefficient are excitation sources and key influencing factors to frictional squeal with obvious inhomogeneous characteristic that is always neglected. In this paper, a multipoint contact flexible pin-on-disc system is established considering tangential stiffness. Then influence of contact stiffness and friction coefficient with heterogeneous distribution on frictional squeal is studied using the complex modal analysis. The research shows that contact stiffness and friction coefficient heterogeneities influence the likelihood of occurrence of the squeal, the freq

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Seon, Junghoon, and Sang Lyong Joo. "Starting Overnight Trading and Changes in Market Frictions: Focusing on KOSPI 200 Futures." Asia Europe Perspective Association 16, no. 4 (2019): 185–200. https://doi.org/10.31203/aepa.2019.16.4.09.

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This paper investigates the impact of starting overnight trading for KOSPI 200 futures on market frictions in regular trading hours. On November 16, 2009, Korea Exchange the extended trading hours by starting overnight trading via Chicago Mercantile Exchange GLOBEX system. Thus non-trading hours out of 24 hours is reduced from 17.75 hours to 6.75 hours. We utilize this event as a natural experiment to investigate whether market frictions in regular trading has changed due to the reduction in non-trading hours. Stoll(2000) points out that the more compensation is need to be paid to liquidity pr

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Hou, Jun Tao, Sheng Ru Qiao, Guo Feng Lu, Cheng Yu Zhang, and Yue Bing Zhang. "Internal Friction of a 2D-C/SiC Composite from 25°C to 400°C." Key Engineering Materials 353-358 (September 2007): 1509–12. http://dx.doi.org/10.4028/www.scientific.net/kem.353-358.1509.

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By means of forced non-resonance under 3-point bending method, the internal frictions of 2D-C/SiC composites are carried out from 25°C to 400°C in air. The effects of temperature, amplitude and frequency on internal frictions have been analyzed. Results show that interface layer plays a dominant role to internal friction. When temperature increases from 25°C to 400°C, internal friction of 2D-C/SiC composite increases slightly, and storage modulus decreases monotonically. With frequency increases from 1Hz to 100Hz, internal friction reduces to a minimum around 10Hz, whereas above 50Hz it arises

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Tiwari, Ashish. "The Role of Friction in Athletic Performance: A Descriptive Analysis." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 04 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem31958.

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Friction is a fundamental force that has a substantial impact on athletic performance across all sports disciplines. This descriptive research investigates the varied impact of friction in building athletic skill. This study looks at how friction affects running, jumping, throwing, and other sports activities by examining static and kinetic frictional forces, as well as elements that influence frictional interactions. The research examines the interaction of athletes, footwear, surfaces, and equipment to explain how friction governs propulsion, stability, and efficiency in sports activity. The

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Zhao, Xue Zeng, Xi Gui Wang, and Yong Mei Wang. "Analysis on the Influence of the Strength and Stiffness under the Contact Conditions for Friction Plate." Key Engineering Materials 579-580 (September 2013): 523–29. http://dx.doi.org/10.4028/www.scientific.net/kem.579-580.523.

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This paper mainly consider the friction plate finite element modeling frictional contact conditions between the slices of components, friction plate assembly of the strength and stiffness of the. Through modal analysis of force and its distribution in different layers of friction plate assembly friction plate, a friction plate component analysis layers, friction plate by the effect of preload on the friction plate assembly strength, and in this state analysis of the friction plate stiffness. On the contact state under different friction plate layers, different pre tightening force under stress

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36

Wei, Zhiyong, Li Xiang, Yajing Kan, Yan Zhang, and Yunfei Chen. "Effects of the normal load on the excited phonons in atomic friction." Journal of Applied Physics 132, no. 17 (2022): 175301. http://dx.doi.org/10.1063/5.0113738.

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Abstract (sommario):

Although the quantitative relationship between the normal load and the induced friction force has been established from the phenomenological laws of friction, it does not answer the question of how mechanical energy is dissipated into heat by exciting phonons. In this study, the effects of normal load on the friction force of a relatively sliding graphene film are investigated by molecular dynamics simulations. The results show that the excited phonon modes couple with the resonant frequency of the entire frictional system, and the enhancement of the normal load is equivalent to the increase o

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37

Gavril, Cezara Măriuca, Vlad Cârlescu, and Bogdan Chiriac. "A Simplified Friction Force Model of Transient Sliding Contact Between Hard and Soft Surfaces I. A Literature Overview of Friction Force Models." Bulletin of the Polytechnic Institute of Iași. Machine constructions Section 70, no. 4 (2024): 9–17. https://doi.org/10.2478/bipcm-2024-0017.

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Abstract (sommario):

Abstract Modelling and simulation of mechanical systems is very useful to predict the system’s response. Friction is important since it influence the functionality and reliability of the system. Friction force is difficult to model in transient regime when relative velocity is zero and some discontinuity appears in simulation. In this paper the authors presented a literature overview regarding the friction force models used to simulate the transient sliding frictional contact in mechanical systems. Also, the authors have proposed a simplified friction force model based on Heaviside function. S

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38

Trzepiecinski, Kubit, Slota, and Fejkiel. "An Experimental Study of the Frictional Properties of Steel Sheets Using the Drawbead Simulator Test." Materials 12, no. 24 (2019): 4037. http://dx.doi.org/10.3390/ma12244037.

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Abstract (sommario):

This article presents the results of an experimental investigation of the frictional resistance arising in a drawbead during sheet metal forming. The frictional characterization of DC04 deep drawing quality steels commonly used in the automotive industry is carried out using a friction simulator. The effects of some parameters of the friction process on the value of the coefficient of friction have been considered in the experimental investigations. The friction tests have been conducted on different strip specimens, lubrication conditions, heights of drawbead and specimen orientations in rela

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39

Kobzev, Kirill, Yuliya Goncharova, and Nataliya Kobzeva. "The process of increasing the stable operation of the working body in crank presses." E3S Web of Conferences 164 (2020): 03017. http://dx.doi.org/10.1051/e3sconf/202016403017.

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Abstract (sommario):

The article considers the study of the synthesized concept of frictional contact of solids in crank presses. As a result of the analysis the possibility of obtaining the maximum load characteristic of the friction contact within the interval of variation of the friction coefficient has been established. The possibility of equality of the values of the friction force of the friction contact at the boundaries of the indicated interval in the presence of a maximum and the achievement of their greatest stability under these conditions is also revealed. As result the upgraded concept of frictional

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40

Kong, Hai-Yan, and Ji-Huan He. "A novel friction law." Thermal Science 16, no. 5 (2012): 1529–33. http://dx.doi.org/10.2298/tsci1205529k.

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Abstract (sommario):

Frictional force is a vitally important factor in the application of engineering either in macroscopic contacts or in micro/nanoscale contacts. Understanding of the influencing factors about frictional force is essential for the design of miniaturized devices and the use of minimal friction force. In the paper, dimensional analysis is used to analysis factors relative to frictional force. We show that the frictional force scales with where A is the contact area and N is the normal contact force. An experiment is carried out to verify the new friction law.

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41

Luo, Xiao Yan, and Wei Ping Liu. "Analysis of Ultralong Friction Pile Based on Gradient Dependent Nonlocal Friction Model." Applied Mechanics and Materials 638-640 (September 2014): 380–83. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.380.

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Abstract (sommario):

Based on the gradient theory, the gradient dependent nonlocal friction model is established. It is a new model which can describe the nonlocal friction effect. Based on Mindlin’s solution of displacement, an elastic solution of the lateral frictional resistance for ultralong friction pile is derived. The ultralong friction pile is analyzed by using the gradient dependent nonlocal friction model. Compared with the solution to the local friction law, the results shows that nonlocal friction law is feasible and reliable. The study is helpful for understanding the friction mechanism in geotechnica

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42

Shishkarev, M. P., and Tien Dung Vu. "Determination of parameters of adaptive friction clutches with single-loop negative feedback." Traktory i sel hozmashiny 81, no. 8 (2014): 32–36. http://dx.doi.org/10.17816/0321-4443-65551.

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Abstract (sommario):

Dependencies of amplification coefficient on frictional coefficient are obtained for adaptive friction clutches with differentiated friction couples and with all leading friction couples. These dependencies allow to exclude theoretically influence of frictional coefficient changes on stability of transmitted load. It is shown that high stability of transmitted load can be achieved only in case of clutches with greater numbers of disks.

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43

Li, Qunyang, and Kyung-Suk Kim. "Micromechanics of friction: effects of nanometre-scale roughness." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 464, no. 2093 (2008): 1319–43. http://dx.doi.org/10.1098/rspa.2007.0364.

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Abstract (sommario):

Nanometre-scale roughness on a solid surface has significant effects on friction, since intersurface forces operate predominantly within a nanometre-scale gap distance in frictional contact. To study the effects of nanometre-scale roughness, two novel atomic force microscope friction experiments were conducted, each using a gold surface sliding against a flat mica surface as the representative friction system. In one of the experiments, a pillar-shaped single nano-asperity of gold was used to measure the molecular-level frictional behaviour. The adhesive friction stress was measured to be 264

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44

Mamatha, B., Mohammed Nashiroddin, Lalitha Ch, Srinivas Kumar, Venkata Naidu, and Sumayya Fatima. "Frictional Resistance in Orthodontics -A Review." South Asian Research Journal of Oral and Dental Sciences 4, no. 2 (2022): 10–14. http://dx.doi.org/10.36346/sarjods.2022.v04i02.002.

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Abstract (sommario):

This article reviews the frictional resistance of archwires based on the cross section, microscopic structure and stiffness. Bracket factors like slot width and depth and material influencing friction. Different types of ligation influencing friction. Role of saliva, biofilm and wire bracket combinations on friction. Friction in wire, bracket and ligation combination.

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45

Bai, Shaoxian, Tao Wang, and Jing Yang. "An Experiment on the Dwell Time Effect of Rubber Seal O-Rings: Friction Force in Intermittent Reciprocating Motion." Materials 17, no. 10 (2024): 2427. http://dx.doi.org/10.3390/ma17102427.

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Abstract (sommario):

The adhesive force between two contact surfaces often leads to an increase in the friction force of the rubber seal O-ring after a certain dwell time, forming dwell time effects and affecting the reliability of sealing. The dwell time effect may result in substantial instability with respect to the frictional behavior of rubber O-rings, which needs to be carefully taken into account in the design of rubber seals. Therefore, in this paper, the dwell time effect of the friction force was studied experimentally for intermittent reciprocating rubber seal O-rings coupled with stainless steel 316L a

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46

Tecco, Simona, Stefano Tetè, and Felice Festa. "Friction between Archwires of Different Sizes, Cross-Section and Alloy and Brackets Ligated with Low-Friction or Conventional Ligatures." Angle Orthodontist 79, no. 1 (2009): 111–16. http://dx.doi.org/10.2319/101107-487.1.

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Abstract (sommario):

Abstract Objective: To test the null hypothesis that no statistically significant difference in frictional resistance is noted when round or rectangular archwires are used in conjunction with low-friction ligatures (small, medium, or large) or conventional ligatures. Materials and Methods: A total of 10 stainless steel brackets, a 0.022-in slot, and various orthodontic archwires, ligated with low-friction ligatures or conventional ligatures, were tested to compare frictional resistance. The archwires employed were 0.014-in and 0.016-in nickel titanium (NiTi), 0.018-in stainless steel (SS), 0.0

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47

Prapai, Jirapat, Monnapas Morakotjinda, Thanyaporn Yotkaew, et al. "Tribological Properties of PM Cu-Based Dry Friction Clutch." Key Engineering Materials 545 (March 2013): 163–70. http://dx.doi.org/10.4028/www.scientific.net/kem.545.163.

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Abstract (sommario):

Sintered Cu-based frictional materials were developed by using powder metallurgy (PM) method. The materials are aimed for application in a passenger car as a dry friction clutch. Effects of sintering temperature and composition on mechanical and tribological properties were determined. It was found that improper frictional material formulations caused inferior properties, particularly when the sintering temperatures were increased. Admixing of high Sn content (8 wt. %) resulted in decreases of sintered density and hardness with increasing sintering temperature. High Sn contents caused swelling

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48

Kang, Chao, Yaoyao Shi, Tao Yu, et al. "Experimental investigation of friction between prepreg tape and compaction roller for prepreg tape hoop winding." Journal of Reinforced Plastics and Composites 37, no. 12 (2018): 853–62. http://dx.doi.org/10.1177/0731684418764018.

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Abstract (sommario):

As an inevitable issue in the filament winding technology, the process-induced friction has gained increasing attention. The purpose of this study is to illustrate the experimental investigation of friction between prepreg tape and hot compaction roller in prepreg tape hoop winding system. Based on the modified version of Howell’s equation, the friction model is established to offer an indirect method for measuring the frictional coefficient during the actual composite fabricating process. Three types of prepreg tapes, namely T300/Y69 unidirectional prepreg tape, T300/DFQS-3 and BWT260-82/DFQS

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49

Zhang, Zixin, Zhuangzhuang Chu, and Xuli Zhu. "Frictional effect of spherical convex textured rigid bodies sliding on smooth PDMS." E3S Web of Conferences 145 (2020): 02055. http://dx.doi.org/10.1051/e3sconf/202014502055.

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Abstract (sommario):

Surface texturing was applied to flexible friction couples to improve their tribological behavior. Spherical convex texture was fabricated on the surface of photosensitive resin by stereolithography (SLA), the friction coefficient between the textured resin sample and smooth polydimethylsiloxane (PDMS) under the conditions of low sliding speed and dry friction was measured using a self-made frictional test bench. It was found that surface texture is capable of reducing friction at low applied normal load compared with the non textured friction couple, as well as increasing friction at high loa

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50

Arakawa, Sota, Hidekazu Tanaka, and Eiichiro Kokubo. "Collisional Growth Efficiency of Dust Aggregates and Its Independence of the Strength of Interparticle Rolling Friction." Astrophysical Journal 939, no. 2 (2022): 100. http://dx.doi.org/10.3847/1538-4357/ac96e1.

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Abstract (sommario):

Abstract The pairwise collisional growth of dust aggregates consisting of submicron-sized grains is the first step of planet formation, and understanding the collisional behavior of dust aggregates is therefore essential. It is known that the main energy dissipation mechanisms are the tangential frictions between particles in contact, namely, rolling, sliding, and twisting. However, there is great uncertainty for the strength of rolling friction, and the dependence of the collisional growth condition on the strength of rolling friction was poorly understood. Here we performed numerical simulat

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