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Journal articles on the topic 'Coefficient Of Friction (COF)'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 September 2023

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1

Tan, Adin Ming, Yehuda Weizman, Firoz Alam, and Franz Konstantin Fuss. "The Coefficient of Friction of Soccer Balls." Proceedings 49, no. 1 (2020): 92. http://dx.doi.org/10.3390/proceedings2020049092.

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Nine soccer balls were tested for their friction against a leather sheet, using a force plate. An average normal force of 63.6 N was applied and the movement of the ball had an average velocity of 15 mm/s. Each test was repeated 15 times and the average Coefficient of Friction (COF) was reported. The following results were obtained: Jabulani (COF: 0.62 ± 0.05); Fracas (COF: 0.41 ± 0.01); Ordem 3 (COF: 0.63 ± 0.02); Teamgeist (COF: 0.38 ± 0.01); Brazuca (COF: 0.45 ± 0.01); Kopanya (COF: 0.39 ± 0.01); React (COF: 0.37 ± 0.01); Finale 15 (COF: 0.39 ± 0.06); Vintage T-panel leather ball (COF: 0.41

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Fiagbe, Yesuenyeagbe A. K., and Emmanuel W. Ramde. "FRICTION COEFFICIENT OF MUNICIPAL SOLID WASTE COMPONENTS." International Journal of Engineering Technologies and Management Research 7, no. 7 (2020): 1–7. http://dx.doi.org/10.29121/ijetmr.v7.i7.2020.702.

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Engineering properties of materials includes coefficient of friction (COF) which are basic in design performance of engineering systems. The COF can be considered as very important in design of handling tools. Various types of handling tools and equipment are used at various stages of disposal and treatment of MSW and COF is one critical property. This paper presents estimate of COF of municipal solid waste components. The components of the municipal solid waste are paper, plastic, organic and others. The estimation of the COF was done using an inclino-tribometer. Waste from 16 sample location

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Varriale, Francesco, Stefano Candeo, Gabriele Riva, Jens Wahlström, and Yezhe Lyu. "A Brake System Coefficient of Friction Estimation Using 3D Friction Maps." Lubricants 10, no. 7 (2022): 134. http://dx.doi.org/10.3390/lubricants10070134.

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The coefficient of friction (COF) is one of the core factors in the evaluation of brake system performance. It is challenging to predict the COF, since it is strongly influenced by several parameters such as contact pressure (p), slip rate (v) and temperature (T) that depend on the driving conditions. There is a need for better models to describe how the brake friction varies under different driving conditions. The purpose of this research is to study the possibility of using 3D friction pvT-maps to estimate the COF of a disc brake system under different driving conditions. The 3D friction pvT

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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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Eun, Jinsu, Jaejin Ryue, Sangsoo Park, and Kikwang Lee. "A Novel Method to Measure the Static Coefficient of Friction for Socks." Sensors 22, no. 15 (2022): 5525. http://dx.doi.org/10.3390/s22155525.

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Mechanical testers have commonly been used to measure the frictional properties of socks. However, the friction values may be susceptible to the level of stretchiness of tested fabrics or human variability. Thus, the aim of this study was to propose a novel method that enables friction measurement of socks in a sock-wearing condition with less human variability effects. Five socks with different frictional properties were chosen. Three experimental ramp tests were performed with an artificial structure shaped like the foot-ankle complex (last) and a ramp tester to quantify the static coefficie

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Schanner, Jonathan, Roman Funke, Andreas Schubert, and Alexander Hasse. "Investigating the Friction Behavior of Turn-Milled High Friction Surface Microstructures under Different Tribological Influence Factors." Journal of Manufacturing and Materials Processing 6, no. 6 (2022): 143. http://dx.doi.org/10.3390/jmmp6060143.

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The coefficient of friction (COF) is an important parameter for mechanical engineers to consider when designing frictional connections. Previous work has shown that a surface microstructuring of the harder friction partner leads to a significant increase in the COF. However, the impact of the changes in the tribological system on the COF are not known in detail. In this study, the tribological influence factors such as the nominal surface pressure, the material pairing, lubrication, and the surface properties of the counterbody are investigated. Microstructuring is applied by turn-milling of a

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7

do Vale, Joao Luiz, Carlos Henrique da Silva, and Giuseppe Pintaude. "Energetic coefficient of friction applied to cylinder liners lab tests." Industrial Lubrication and Tribology 72, no. 9 (2019): 1103–8. http://dx.doi.org/10.1108/ilt-08-2019-0324.

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Purpose This paper aims to present a proposal for evaluating the coefficient of friction (COF), under a reciprocating test that considers the energy dissipated by the friction force. In addition, this new parameter is compared to average COF, which is often used to evaluate COF in reciprocating tests. Design/methodology/approach Samples of compacted graphite iron were extracted directly from an internal combustion engine block. The piston ring used was a nitrided martensitic stainless steel with an asymmetrical profile, and the lubricant oil was the SAE 30 CF, controlled at 40°C. Different tes

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Swensen, Eric E., Jerry L. Purswell, Robert E. Schlegel, and Ronald L. Stanevich. "Coefficient of Friction and Subjective Assessment of Slippery Work Surfaces." Human Factors: The Journal of the Human Factors and Ergonomics Society 34, no. 1 (1992): 67–77. http://dx.doi.org/10.1177/001872089203400108.

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Research was conducted to determine how well subjects could distinguish between surfaces with different coefficient of friction (COF) values and to evaluate how well subjective ratings of slipperiness correlated with the actual COF values. Thirty-three ironworkers experienced in working and walking on steel surfaces and 23 university students inexperienced with these tasks participated in the study. Subjective slipperiness ratings for a variety of climbing and walking conditions were obtained from the subjects. It was found that subjects could identify differences in the slipperiness of four t

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9

Chen, Xiang, Zhong Han, Xiuyan Li, and K. Lu. "Lowering coefficient of friction in Cu alloys with stable gradient nanostructures." Science Advances 2, no. 12 (2016): e1601942. http://dx.doi.org/10.1126/sciadv.1601942.

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The coefficient of friction (COF) of metals is usually high, primarily because frictional contacts induce plastic deformation underneath the wear surface, resulting in surface roughening and formation of delaminating tribolayers. Lowering the COF of metals is crucial for improving the reliability and efficiency of metal contacts in engineering applications but is technically challenging. Refining the metals’ grains to nanoscale cannot reduce dry-sliding COFs, although their hardness may be elevated many times. We report that a submillimeter-thick stable gradient nanograined surface layer enabl

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Li, Kai Way, Hsuan Cheng Lin, Ching Chung Chen, Li Wen Liu, and Chih Yong Chen. "Measurements of Friction Coefficient on Kitchen Floors in Restaurants." Applied Mechanics and Materials 303-306 (February 2013): 773–76. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.773.

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Friction measurements in the field were conducted in twelve restaurants in Taiwan. Four restaurants for each of the Chinese style, western style, and western style fast food restaurant were visited. The Brungraber Mark II slipmeter was adopte to measure the coefficient of friction (COF) in three areas in each of the restaurant. The results showed that three, two Chinese style and one western style, of the restaurants had mean COF lower than 0.5, a safety standard commonly adopted in the USA. Engineering/managerial interventions are required for those restaurants as far as employee safety is co

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Hsu, Yao Wen, and Kai Way Li. "The Measurements of Friction Coefficient on Ramps among Different Floor Materials." Applied Mechanics and Materials 303-306 (February 2013): 790–93. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.790.

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This study investigates the influences of slopes on objective friction measurements of different floor materials. It is known that a person is more likely to slip when walking on a slope than when walking on a level surface. In term of the prevention of falls for elders and MMH (manual material handling) workers, slope is more commonly in the design of barrier-free environments. However, it could be a potential environmental risk of slip accidents. The environmental problems were generally caused by poor floor slipperiness. The coefficient of friction (COF) is one of important objective indexe

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Ur Rehman, Zia, M. Gulzar, and Muhammad Kamran Shaukat. "Effect of Temperature on Friction Behavior of Epoxy Resin Composite Coatings for Sliding Contact." Pakistan Journal of Engineering and Technology 5, no. 4 (2022): 1–7. http://dx.doi.org/10.51846/vol5iss4pp1-7.

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Epoxy composite coatings are used to reduce friction in mechanical components. The epoxy composites at high temperatures cause serious frictional effects due to poor surface characteristics. Hence, there is a need to find a substitute to improve their frictional behaviour in high-temperature conditions. Adding fillers and lubrication are key solutions to improve tribological properties. In this research work, diglycidyl ether of bisphenol A (DGEBA) epoxy resin was coated on steel, and silica powder (5% by weight) was used as filler. The experiments were conducted under dry and lubricated condi

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Setiyana, Budi, Muhammad Khafidh, Mohammad Tauviqirrahman, Rifky Ismail, Jamari, and Dirk Jan Schipper. "Friction and Wear Pattern of Silica-Reinforced Styrene-Butadiene Rubber (SBR) in Sliding Contact with a Blade Indenter." Lubricants 9, no. 11 (2021): 110. http://dx.doi.org/10.3390/lubricants9110110.

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This study investigated the friction and wear pattern of silica-reinforced Styrene-Butadiene Rubber (SBR) in sliding friction with a steel blade indenter. The experiments were conducted using a pin-on-disc tribometer at various applied loads and examined under dry and wet contact conditions. Analysis was focused on investigating the coefficient of friction and length of wear pattern spacing. Related to coefficient of friction identification, the abrasion theory was applied here. In addition, the stick-slip theory to identify the wear pattern spacing was also applied. Results of the experiments

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14

Riva, Gabriele, Francesco Varriale, and Jens Wahlström. "A finite element analysis (FEA) approach to simulate the coefficient of friction of a brake system starting from material friction characterization." Friction 9, no. 1 (2020): 191–200. http://dx.doi.org/10.1007/s40544-020-0397-9.

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Abstract The coefficient of friction (COF) is one of the most important parameters to evaluate the performance of a brake system. To design proper brake systems, it is important to know the COF when estimating the brake force and resulting torque. It is challenging to simulate the COF since friction in disc brakes is a complex phenomenon that depends on several parameters such as sliding velocity, contact pressure, materials, and temperatures, etc. There is a lack of studies found in the literature focusing on simulation of the COF for a full brake system based on tribometer material character

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15

Liew, W. Y. H., Sebastian Dayou, M. Azlan Bin Ismail, Nancy J. Siambun, and Jedol Dayou. "Dry Sliding Behaviour of AlCrN and TiN Coatings." Advanced Materials Research 576 (October 2012): 559–62. http://dx.doi.org/10.4028/www.scientific.net/amr.576.559.

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This paper examines the friction behaviour of AlCrN and TiN PVD coatings in atmospheric air and vacuum using a ball-on-disc and a reciprocating tribotesters. Comparative study on the coating sliding in air and in high vacuum environment provides important insight on the effect of oxidation on the friction behaviour of the coatings. Other important factors such as load, sliding velocity, temperature effects on the frictional behaviour of these coatings were also investigated. In the ball-on-disc tests carried out in vacuum, (i) TiN gave lower coefficient of friction (COF) than AlCrN, indicating

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16

Cheng, Yi-Ching, Chang-Mou Wu, Po-Chun Lin, Wen-You Lai, Po-Hsun Chen, and Tzong-Der Way. "Friction behaviors of staple carbon fiber composites." Modern Physics Letters B 34, no. 07n09 (2020): 2040002. http://dx.doi.org/10.1142/s0217984920400023.

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This study aims to examine the frictional behavior of staple carbon fiber composites (sCFCs). The staple carbon fiber reinforced polycarbonate (PC) composites were prepared by film stacking for two different impregnation levels. Mechanical properties such as tensile and flexural strengths and moduli and static/dynamic friction coefficient (COF) were determined. The COF and temperature as a function of wearing cycles for sCFCs subjected to different applied pressures were also determined by a disk-on-disk sliding wear test machine. The less impregnated sample exhibited superior tribological per

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Shen, Bin, and Fang Hong Sun. "Influence of Surface Morphology of Diamond Films on their Frictional Behaviors in Dry and Water Environments." Advanced Materials Research 53-54 (July 2008): 331–36. http://dx.doi.org/10.4028/www.scientific.net/amr.53-54.331.

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The influence of surface morphology of diamond films on their friction behaviors was investigated under both ambient air and water environments. The diamond films with three different surface morphologies were deposited on the Co-cemented tungsten carbide (WC-6wt%Co) substrate using hot filament chemical vapor deposition (HFCVD) method and their frictional behavior were studied on a ball-on-plate type reciprocating friction tester, where the ball-bearing steel was used as the counterface materials. The coefficient of friction (COF) of diamond films showed strong surface morphology dependence,

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18

Chu, Yanqiu, Jing Xu та Changsheng Li. "Preparation and Coefficient of Friction of YBa2Cu3O7-δ/Graphene Oxide Composites". International Journal of Surface Engineering and Interdisciplinary Materials Science 4, № 2 (2016): 23–33. http://dx.doi.org/10.4018/ijseims.2016070102.

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YBa2Cu3O7-d/graphene oxide (YBCO/GO) composite materials were fabricated by using powder metallurgy process combined with cold isostatic pressing (CIP) technique. The coefficient of friction (COF) of YBCO matrix composites with addition of 0, 0.5, 1.0 and 2.0 wt% GO were reported for the first time. The friction behavior was observed by means of the ball-on-disk technique with a steel ball used as the counterpart in ambient atmospheric and dry sliding condition. The measured properties were then assessed with respect to sliding speed and the mass fraction of the GO additives. GO is able to red

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Varriale, Francesco, Gabriele Riva, Jens Wahlström, and Yezhe Lyu. "A Mesoscopic Simulation Approach Based on Metal Fibre Characterization Data to Evaluate Brake Friction Performance." Lubricants 10, no. 3 (2022): 34. http://dx.doi.org/10.3390/lubricants10030034.

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The coefficient of friction (COF) is an important parameter when evaluating brake system performance. It is complex to predict friction due to its dependence on parameters, such as sliding velocity, contact pressure, temperature, and friction material mixtures. The aim of this work is to evaluate the macroscopic COF of a disc brake system under specific braking conditions by a meso-scale approach, using a cellular automaton simulation where the friction material mixture is modelled starting from its basic components. The influence of the local components in contact is taken into account. Simul

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Khaday, Samsiya, Kai-Way Li, Lu Peng, and Ching-Chung Chen. "Relationship between Friction Coefficient and Surface Roughness of Stone and Ceramic Floors." Coatings 11, no. 10 (2021): 1254. http://dx.doi.org/10.3390/coatings11101254.

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Slips and falls are common occupational incidents worldwide. The friction on a floor surface is one of the critical environmental factors affecting the risk of a slip. In this research, we conducted friction measurements on stone and ceramic floor tiles under dry, wet, and water–detergent (WD) solution covered conditions using a horizontal pull slip meter (HPS). Our purposes were to quantify the slip resistance of commonly used stone and ceramic floors under different surface conditions and to validate the curvilinear relationship between the coefficient of friction (COF) and surface roughness

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Hu, Ningning, Xiuheng Zhang, Xianghui Wang, Na Wu, and Songquan Wang. "Study on Tribological Properties and Mechanisms of Different Morphology WS2 as Lubricant Additives." Materials 13, no. 7 (2020): 1522. http://dx.doi.org/10.3390/ma13071522.

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In the present work, the relationship curve of the coefficient of friction (COF) with varying loads of different morphology WS2 lubricating additives in the friction process at various sliding speeds was studied. On this basis, wear marks and elements on the wear surfaces after friction were analyzed, and then the anti-wear and mechanism effects of WS2 of different forms in the lubrication process were discussed. Meanwhile, the Stribeck curve was used to study the lubrication state of the lubricating oil in the friction process. It was revealed that the COF of lubricating oil containing lamell

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Yap Jun Heng, Nurul Farhana Mohd Yusof, Lee Ann Yen, Shazlina Abd Hamid, and Nurul Nadzirah Mohd Yusof. "A Contact Characteristic of Roller Bearing with Palm Oil-based Grease Lubrication." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 89, no. 2 (2021): 139–49. http://dx.doi.org/10.37934/arfmts.89.2.139149.

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Grease lubricants are widely used in rolling contact applications to reduce friction between two rolling surfaces. Improper lubrication may cause high contact stress and deformation to the bearings and lead to machine failure The purpose of this study is to investigate the coefficient of friction produced by newly developed palm oil-based grease and to investigate the contact characteristics in lubricated roller bearings. In this work, the coefficient of friction of new greases was evaluated experimentally and the values were compared with the conventional mineral oil-based grease to investiga

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Srinivasan, D., M. Meignanamoorthy, Amel Gacem, et al. "Tribological Behavior of Al/Nanomagnesium/Aluminum Nitride Composite Synthesized through Liquid Metallurgy Technique." Journal of Nanomaterials 2022 (August 24, 2022): 1–12. http://dx.doi.org/10.1155/2022/7840939.

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Despite its excellent qualities such as hardness, tensile, and yield strength, aluminum alloys are mostly used in aviation fins and car frames. However, wear resistance at maximum load is weak. This effort will now synthesize and investigate the tribological behavior of AA6063- (AlMg0.7Si-) AlN composites. The goal of this experiment is to determine the best wear rate and coefficient of friction for the AA6063-AlN with nanomagnesium composites developed. Weight percent, load (L), sliding velocity (SV), and sliding distance (SD) are the process factors studied, and the output responses are wear

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Hayden, Lyndsey R., Sarah Escaro, Dewey R. Wilhite, R. Reid Hanson, and Robert L. Jackson. "A Comparison of Friction Measurements of Intact Articular Cartilage in Contact with Cartilage, Glass, and Metal." Journal of Biomimetics, Biomaterials and Biomedical Engineering 41 (April 2019): 23–35. http://dx.doi.org/10.4028/www.scientific.net/jbbbe.41.23.

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The goal of this study was to develop a method of friction testing utilizing cartilage counter surfaces with a complete subchondral bone plate and compare the results to the cartilage on glass and metal (steel) counter surfaces. Articular cartilage surfaces with the underlying subchondral bone intact were not isolated through plug removal. Friction testing was completed using a tribometer (n=16). The coefficient of friction (COF) was measured between the proximal articular surfaces of the second carpal bone when brought into contact with the articular surface of the distal radial facet. The CO

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Kshirsagar, Mrunal P., and Hrishikesh P. Khairnar. "Comparison of the theoretical and experimental coefficient of friction for the brake disc-brake pad system." Tribology and Materials 2, no. 2 (2023): 78–87. http://dx.doi.org/10.46793/tribomat.2023.009.

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Contact between the automotive brake pad and the disc is mathematically modelled to estimate the coefficient of friction (COF). The mathematical model is proposed for the prognosis of the COF of brake pad material, by considering the contact mechanics between the interfacing surface and their material properties. The Greenwood-Williamson contact model is applied for rough contact surfaces for the estimation of the real contact radius. A MATLAB program has been formulated for generating the surface of brake pad material by considering its material properties which aid in the analytical evaluati

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Banerji, A., S. Bhowmick, M. J. Lukitsch, and A. T. Alpas. "Friction Behaviour of Multilayered Graphene against Steel." MRS Proceedings 1812 (2016): 1–8. http://dx.doi.org/10.1557/opl.2016.10.

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ABSTRACTFrictional behaviour of multilayered graphene was studied in air with different relative humidity (RH) levels (10–52% RH). Pin-on-disk type sliding tests were performed and the running-in and steady state coefficient of friction (COF) values were measured against M2 tool steel counterface. On increasing the RH, multilayered graphene showed a reduction in steady state COF from 0.11 at 10% RH to 0.08 at 52% RH. The low steady state COF values observed in graphene could be attributed to the transfer layer formed on the M2 tool steel counterface. A sliding-induced structural change was obs

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Wei, Yuan, Jesus Resendiz, Robert Tomkowski, and Xu Liu. "An Experimental Study of Micro-Dimpled Texture in Friction Control under Dry and Lubricated Conditions." Micromachines 13, no. 1 (2021): 70. http://dx.doi.org/10.3390/mi13010070.

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Friction control is a vital technology for reaching sustainable development goals, and surface texturing is one of the most effective and efficient techniques for friction reduction. This study investigated the performance of a micro-dimpled texture under varying texture densities and experimental conditions. Reciprocating sliding tests were performed to evaluate the effects of the micro-dimpled texture on friction reduction under different normal loads and lubrication conditions. The results suggested that a micro-dimpled texture could reduce the coefficient of friction (CoF) under dry and lu

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Chen, Zhengpu, Carl Wassgren, and Kingsly Ambrose. "Measurements of Grain Kernel Friction Coefficients Using a Reciprocating-Pin Tribometer." Transactions of the ASABE 63, no. 3 (2020): 675–85. http://dx.doi.org/10.13031/trans.13748.

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Highlights A tribometer was used to measure the friction coefficients of corn and wheat kernels. Both static and dynamic friction coefficients were measured for particle-wall interaction. Data analysis processes were developed to calculate dynamic friction coefficients for inter-particle interaction. Abstract. Various devices have been developed to measure the coefficient of friction (COF) of grain kernels; however, the majority of these tests measure the particle-wall COF at a bulk level. A method that can accurately measure both particle-wall and inter-particle COFs at a single-particle leve

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Ma, Zhiwei, Changsong Zheng, Cenbo Xiong, Liang Yu, Yujian Liu, and Cunzheng Zhang. "Friction-Wear Characteristics of Carbon Fiber Reinforced Paper-Based Friction Materials under Different Working Conditions." Materials 15, no. 10 (2022): 3682. http://dx.doi.org/10.3390/ma15103682.

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To study the friction and wear performance of carbon fiber reinforced friction materials under different working conditions, paper-based friction materials with different fibers were prepared. Experiments on the SAE#2 test bench were conducted to study the infectors including friction torques, surface temperature, coefficient of friction (COF), and surface morphologies. The results were analyzed, which indicated that the carbon fiber reinforced friction material could provide a higher friction torque and a lower temperature rising rate under the applied high pressure and high rotating speed co

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Martinelli, Giovanni, Paolo Plescia та Emanuela Tempesta. "“Pre-Earthquake” Micro-Structural Effects Induced by Shear Stress on α-Quartz in Laboratory Experiments". Geosciences 10, № 5 (2020): 155. http://dx.doi.org/10.3390/geosciences10050155.

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This paper presents the results of measurements performed on α-quartz subjected to shear stress in dry conditions, to understand the relationship between the shear intensity and the resulting physical and chemical effects. If a shear stress of intensity higher than 100 MPa is applied continuously to alpha quartz crystals, they will tend to lose their crystallinity, progressively reduce their friction coefficient (Cof) and change into a low-order material, apparently amorphous under X-ray diffraction, but with a structure different from silica glass. Raman and Pair Distribution Function analyse

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Trzepieciński, Tomasz, Ján Slota, Ľuboš Kaščák, Ivan Gajdoš, and Marek Vojtko. "Friction Behaviour of 6082-T6 Aluminium Alloy Sheets in a Strip Draw Tribological Test." Materials 16, no. 6 (2023): 2338. http://dx.doi.org/10.3390/ma16062338.

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Aluminium alloy sheets cause many problems in sheet metal forming processes owing to their tendency to gall the surface of the tool. The paper presents a method for the determination of the kinematic friction coefficient of friction pairs. The determination of coefficient of friction (COF) in sheet metal forming requires specialised devices that ‘simulate’ friction conditions in specific areas of the formed sheet. In this article, the friction behaviour of aluminium alloy sheets was determined using the strip drawing test. The 1-mm-thick 6082 aluminium alloy sheets in T6 temper were used as te

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Ningrum, Putri Intan Puspa, Ani Mulyasuryani, and Rakhma Febriani. "The Effect of Slip Polymer Additives on the Characteristics of Polyethylene Films." IJCA (Indonesian Journal of Chemical Analysis) 6, no. 1 (2023): 75–84. http://dx.doi.org/10.20885/ijca.vol6.iss1.art8.

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Polymer additive’s function is to improve film quality, including slip additives which function as film surface lubricants. Slip additives affect the physical characteristics of the film as indicated by the coefficient of friction and optical properties. In this research, the influence of slip additives and the aging time of the coefficient of friction (COF) and the optical properties of polyethylene (PE) films have been studied. The optical properties of the film are measured based on the haze value and the gloss value. The additives used in this study were erucamide, stearyl erucamide, and a

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Trzepiecinski, Tomasz, and Hirpa G. Lemu. "Effect of Lubrication on Friction in Bending under Tension Test-Experimental and Numerical Approach." Metals 10, no. 4 (2020): 544. http://dx.doi.org/10.3390/met10040544.

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This paper is aimed to determine the value of coefficient of friction (COF) at the rounded edge of the die in the sheet metal forming operations using the bending under tension (BUT) test. The experimental part of the investigations is devoted to the study of the frictional resistances of low alloy steel sheet under different strains of the specimen, surface roughnesses of the tool and for different lubrication conditions. Three oils are destined for different conditions of duties in the stamping process. Numerical modeling of the material flow in the BUT test has been conducted in the MSC.Mar

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Kothasiri, Anupama Francy, Srinivasa Rao Chalamalasetti, and Gopalakrishnaiah Peteti. "MULTIPLE PROCESS PARAMETER OPTIMIZATION OF FORWARD EXTRUSION PROCESS ON AA 2024." International Journal of Modern Manufacturing Technologies 13, no. 2 (2021): 63–75. http://dx.doi.org/10.54684/ijmmt.2021.13.2.63.

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Extrusion is a simple metal forming process in which a block of metal is forced through a die orifice with a certain shape under high pressure. This extrusion process is influenced by many process parameters such as die angle (DA), ram speed (RS), coefficient of friction (COF), Extrusion ratio, Die land height, work piece diameter and length, material properties etc. In extrusion process, extrusion force is crucial parameter, the flow of metal and hence the extrusion force is significantly influenced by the above parameters which results in quality of the product. The present study numerically

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Rodríguez Jiménez, Rebeca Cristal, Julian Hernández Torres, R. Galván Martínez, Luis Zamora Peredo, and Leandro García González. "Hardness and Friction Coefficient Analysis of Electrochemically Anodized Ti-6Al-4V." ECS Transactions 106, no. 1 (2022): 163–70. http://dx.doi.org/10.1149/10601.0163ecst.

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Electrochemical anodization was performed for surface modification of Ti-6Al-4V, using an HCl-based electrolyte. The effect of increasing the electrode spacing of the electrochemical cell by 1, 2, and 2.5 cm on the hardness and COF was investigated. Using a 0.5 M solution of HCl and glycerol in different percentages (85, 90, and 95 %), a voltage of 30 V and a time of 5 minutes. The results revealed the growth of nanotubular structures, which contribute to the increase in hardness, obtaining a maximum of 7.1 GPa for the anodized samples and the reduction of COF to a minimum of 0.5. While the he

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Myalski, Jerzy, Marcin Godzierz, Karolina Olszowska, et al. "Glassy Carbon Open-Celled Foams as a Reinforcement in Polymer Matrix Composites Dedicated for Tribological Applications." Materials 16, no. 5 (2023): 1805. http://dx.doi.org/10.3390/ma16051805.

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This work presents the results of a tribological examination of polymer matrix composites reinforced with carbon foams with different porosity. The application of open-celled carbon foams allows an easy infiltration process by liquid epoxy resin. At the same time, carbon reinforcement remains its initial structure, which prevents its segregation in polymer matrix. Dry friction tests, conducted under 0.7, 2.1, 3.5 and 5.0 MPa loads, show that higher friction load results in higher mass loss, but it strongly lowers the coefficient of friction (COF). The change in coefficient of friction is relat

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Wang, Yanshuang, Qingguo Qiu, Pu Zhang, Xudong Gao, Zhen Zhang, and Pengcheng Huang. "Correlation between Lubricating Oil Characteristic Parameters and Friction Characteristics." Coatings 13, no. 5 (2023): 881. http://dx.doi.org/10.3390/coatings13050881.

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In order to help one to judge the friction properties of lubricating oils without tests, this paper intends to establish the correlation between the characteristic parameters of lubricating oils and the friction properties. The elastohydrodynamic and boundary friction properties of poly alpha olefin (PAO) synthetic oil, polyol ester oil and paraffin-based mineral oil were tested using a Mini-Traction Machine. Fourier transform infrared microscopy is used to identify material changes before and after friction tests. The kinematic and dynamic viscosities of the three lubricating oils were measur

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Roupec, Jakub, Filip Jeniš, Zbyněk Strecker, Michal Kubík, and Ondřej Macháček. "Stribeck Curve of Magnetorheological Fluid within Pin-on-Disc Configuration: An Experimental Investigation." Materials 13, no. 20 (2020): 4670. http://dx.doi.org/10.3390/ma13204670.

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The paper focuses on the coefficient of friction (COF) of a magnetorheological fluid (MRF) in the wide range of working conditions across all the lubrication regimes—boundary, mixed, elastohydrodynamic (EHD), and hydrodynamic (HD) lubrication, specifically focused on the common working area of MR damper. The coefficient of friction was measured for MR fluids from Lord company with concentrations of 22, 32, and 40 vol. % of iron particles at temperatures 40 and 80 °C. The results were compared with a reference fluid, a synthetic liquid hydrocarbon PAO4 used as a carrier fluid of MRF. The result

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Yu, Ma, Chen, Li, Ma, and Liu. "Comparison of the Friction and Wear Characteristics between Copper and Paper Based Friction Materials." Materials 12, no. 18 (2019): 2988. http://dx.doi.org/10.3390/ma12182988.

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Copper-based friction material (CFM) and paper-based friction material (PFM) are the two most commonly used clutch friction materials. The friction and wear characteristics of these two kinds of friction materials under dry conditions were investigated by the pin-on-disc test over a broad range of applied loads, rotating speeds and ambient temperatures. Before experiments, the running-in test was conducted to stabilize the coefficient of friction (COF) and wear amount of the test samples. After experiments, the metallographic micrographs of the tested samples were presented to investigate the

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Yang, Lian Fa, Cong Qiang Wu, and Feng Jun Chen. "COF Measurement of Tubes by Hydraulic Bulging with Radial Crushing." Advanced Materials Research 189-193 (February 2011): 2597–600. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.2597.

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A new method of determining the coefficient of friction (COF) in expansion zone of tube hydroforming (THF) is proposed. The measuring method features that a round tube is hydro-formed into a square one by a radial compression accompanying a constant internal hydraulic pressure p, and the difference ΔL of the two diagonal lengths of the square section of deformed tube is taken as measuring index for COF. The relationships between the ΔL and the p, COF, relative displacement S/S0 of moving punches are established by the finite element (FE) simulation of the forming process. The COF can be determ

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Li, Li Xin, Xue Quan Liu, Cun Guang Ding, Yi Li, Fa Chang Li, and Jin Pu Li. "Ti₃SiC₂ – A New High Temperature Solid Self-Lubricating Additive Agent." Advanced Materials Research 815 (October 2013): 626–31. http://dx.doi.org/10.4028/www.scientific.net/amr.815.626.

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With the additive agent Ti3SiC2, the dry sliding behavior of Cr3C2-Ni and Cr3C2-Ni-Ti3SiC2 composites against GCr15 was investigated with a pin-on-disk tester at 400 °C in air under the load of 200N. Without Ti3SiC2, the dynamic coefficient of friction (COF) curves was fluctuated severely. After adding Ti3SiC2, the COF was decreased from 0.37 to 0.32, and the initial transition region of dynamic COF curve was shortened. These tribological test results showed that Ti3SiC2 was a new kind of solid additive agent with favorable high temperature self-lubricating property, and two possible mechanism

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Trzepieciński, Tomasz, and Marcin Szpunar. "Assessment of the effectiveness of lubrication of Ti-6Al-4V titanium alloy sheets using radial basis function neural networks." Acta Polytechnica 61, no. 3 (2021): 489–96. http://dx.doi.org/10.14311/ap.2021.61.0489.

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The aim of the research presented in this article was to determine the value of the friction coefficient using a simple tribological test and to build an empirical model of friction with the use of radial basis function artifi-cial neural networks. The friction tests were carried out on a specially designed friction simulator that allows a sheet metal strip to be drawn between two fixed dies. The test materials were sheets of Ti-6Al-4V titanium alloy with a thickness of 0.5 mm. The friction tests were carried out with variable contact forces of counter-samples with rounded surfaces and in vari

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Hu, Song, Ge Shi, Qinggang Guo, Long Zheng, Luquan Ren, and Chao Su. "The Tribological Adaptability for Ventral Scales of Dinodon rufozonatum in Dry/Wet/Rough Environments." Coatings 12, no. 1 (2021): 20. http://dx.doi.org/10.3390/coatings12010020.

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The ventral scales of Dinodon rufozonatum were investigated to understand the outstanding tribological adaptability in various environments. The coefficient of friction (COF) of ventral scales was measured and changed with the contact conditions. It was discovered that the COF of scales under water-lubrication conditions (WLC) was larger than that under dry conditions (DC). More interestingly, the COF increased first and then decreased as the substrate roughness reduced. The abrasion marks on scales were then observed. The results indicated that the scales in DC wore more gently than that in W

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Fekete, Gusztáv. "Numerical Wear Analysis of a PLA-Made Spur Gear Pair as a Function of Friction Coefficient and Temperature." Coatings 11, no. 4 (2021): 409. http://dx.doi.org/10.3390/coatings11040409.

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Polylactic acid (PLA)-made machine elements exhibit easy machining, biodegradability, and excellent mechanical properties. However, enhancing their wear resistance is still a crucial engineering point, which may be achieved by altering (lowering) their coefficient of friction (CoF). Therefore, the first aim of this paper is to analyze how wear is affected by the alteration of CoF. The second aim is connected to the fact that PLA is sensitive to heat, which also limits its applicability. Accordingly, the next goal is to explore the effect of temperature on wear propagation. This study answers t

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Li, Kai Way, and Chan Chi Lin. "Effects of Floor Material, Surface Condition, and Foot Moving Speed on the Coefficient of Friction on the Floor." Applied Mechanics and Materials 303-306 (February 2013): 2704–7. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2704.

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A laboratory study was conducted to measure the coefficient of friction between the foot and the floor under three surface and two foot sliding speed conditions. A force platform was adopted to measure the ground reaction force (GRF) of the foot on the floor. The coefficient of friction was calculated as the ratio of vertical and horizontal GRF. Five male subjects were recruited. They were requested to slide their right foot on the tested floor which was mounted on the force platform. The results indicated that floor material, surface condition, and foot sliding speed were all significant fact

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Trzepiecinski, Tomasz, and Hirpa G. Lemu. "Recent Developments and Trends in the Friction Testing for Conventional Sheet Metal Forming and Incremental Sheet Forming." Metals 10, no. 1 (2019): 47. http://dx.doi.org/10.3390/met10010047.

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Friction is the main phenomenon that has a huge influence on the flow behavior of deformed material in sheet metal forming operations. Sheet metal forming methods are one of the most popular processes of obtaining finished products, especially in aerospace, automobile, and defense industries. Methods of sheet forming are carried out at different temperatures. So, it requires tribological tests that suitably represent the contact phenomena related to the temperature. The knowledge of the friction properties of the sheet is required for the proper design of the conditions of manufacturing proces

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Nikam, Manoj D., Dipak Shimpi, Kiran Bhole, and Sachin A. Mastud. "Design and Development of Surface Texture for Tribological Application." Key Engineering Materials 803 (May 2019): 55–59. http://dx.doi.org/10.4028/www.scientific.net/kem.803.55.

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Surface texturing is a process of fabricating specific patterns on a surface to enhance surface properties such as friction, contact area, air aspiration, wear, hydrophobicity, etc. Fabricating surfaces with planned micro features is an effective method to improve tribological performance of the interacting surfaces. Laser surface texturing process is one of the best suitable processes for producing micro-patterns. Micro textures are imparted on HSS discs using CO2 laser, varying the shape and dimensions of the resulting dimples affecting the frictional coefficient and wear. Experiments have b

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Hussain, Abrar, Vitali Podgursky, Dmitri Goljandin, et al. "Tribological and Mechanical Properties Investigations of Post-Consumer Cotton Textiles." Solid State Phenomena 320 (June 30, 2021): 97–102. http://dx.doi.org/10.4028/www.scientific.net/ssp.320.97.

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In this manuscript surface roughness, coefficient of friction (COF) and tensile properties of a post-consumer cotton fabric are evaluated. Fabric roughness, COF, effective tensile force and breaking force measured by optical profilometer, CETR tribometer and Instron tensile machine, respectively. The results proved that COF could rely on fabric pattern. Moreover, microscopically roughness influences on friction and tensile properties due to surface defects. It was found that increase in roughness of textile cotton relates to increase of number of random directional fibers. These fibers intensi

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Liu, Mengmeng, Lihui Wang, Caixia Zhang, Yanhong Cheng, Congbin Yang, and Zhifeng Liu. "Regulation Mechanism for Friction Coefficient of Poly(vinylphosphoric acid) (PVPA) Superlubricity System Based on Ionic Properties." Nanomaterials 12, no. 13 (2022): 2308. http://dx.doi.org/10.3390/nano12132308.

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Adjustable lubrication aims to achieve active control of the relative motion of the friction interface, providing a new idea for intelligent operation. A new phenomenon of sudden changes of friction coefficient (COF) in the poly(vinylphosphoric acid) (PVPA) superlubricity system by mixing different lubricants, was found in this study. It was found that anions were the critical factor for the COF change. The change degrees of the COF were investigated by a universal micro tribometer (UMT). A quartz crystal microbalance (QCM)-D was used to analyze the adsorption quantity of anions on the PVPA su

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Abdo, Jamil, and Amer Al-Yhmadi. "The Effect of Controlled Frequency and Amplitude of Vibration on Friction." Solid State Phenomena 147-149 (January 2009): 380–86. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.380.

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An in-house pin-on-disc apparatus is designed and constructed to perform the tests and the design of experiments technique is utilized to determine the effect of vibration, amplitude of vibration, surface roughness, and sliding speed and their cross influence on coefficient of friction for 304 stainless steel and Alloy 6061 Aluminum. The design is performed using response surface method (RSM). The coefficient of friction (CoF) is analyzed as a nonlinear function of the factors and predicted by a second-order polynomial equation. Results suggested that the presence of vibration affect the frict

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