scholarly journals A new kind of resin-based wet friction material: Non-woven fabrics with isotropic fiber networks as preforms

Friction ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 92-103 ◽  
Author(s):  
Yewei Fu ◽  
Le Zhou ◽  
Tao Yin ◽  
Zhongyao Luo ◽  
Hejin Li ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Low Cost ◽  
Static Friction ◽  
Friction Material ◽  
Woven Fabrics ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Dynamic Friction Coefficient ◽  
Wet Friction ◽  
Long Fibers

AbstractAs an alternative to short fibers, non-woven fabrics (NWFs) were made using different types of long fibers to optimize the performance of paper-based friction materials and their technology. In this investigation, the fillers and resin were impregnated into these NWFs to prepare three kinds of wet friction material. The tribological, mechanical, and thermal properties of the new wet friction material were studied. The results indicate that the dynamic friction coefficient of the new friction material is approximately 0.12 and the static friction coefficient is approximately 0.15; the better wear rate is 0.81334 × 10-14 m3·(N·m)-1. In addition, the temperature for 10% mass loss yielded 100 °C enhancement and the tensile strength was improved by 200%, compared to previously reported values. Most importantly, the advantages include a simple preparation flow, low cost, and resource conservation. This is a promising approach for the future development of paper-based friction materials.

Experimental investigation and prediction method of fretting wear in rack-plane spline couplings

2020 ◽  
pp. 135065012093983
Author(s):  
Xiangzhen Xue ◽  
Jipeng Jia ◽  
Qixin Huo ◽  
Junhong Jia
Keyword(s):  
Friction Coefficient ◽  
Wear Mechanism ◽  
Static Friction ◽  
Experimental Results ◽  
Fretting Wear ◽  
Accurate Estimation ◽  
Dynamic Friction ◽  
Static Friction Coefficient ◽  
Dynamic Friction Coefficient ◽  
Involute Spline

To investigate the fretting wear of involute spline couplings in aerospace, rack-plane spline couplings rather than the conventional involute spline couplings in aerospace were used to conduct tribological experiments, and it was assumed that the rack-plane spline couplings exhibit consistent contact stress with the real involute spline couplings in aerospace. The relationships among the static friction coefficient, dynamic friction coefficient, and fretting friction coefficient were established via tribological experiments, as well as the fretting-wear mechanism of the rack-plane spline couplings was examined. A fretting-wear estimation model based on the fretting-wear mechanism was developed. By applying the modified Archard equation and Arbitrary Lagrangian–Eulerian adaptive, mesh smoothing algorithm of Abacus was used. According to our experimental results, the fretting wear of the rack-plane spline couplings consisted primarily of abrasive wear, oxidative wear, and adhesive wear. For both, lubrication and non-lubrication settings, the fretting friction coefficient of 18CrNi4A steel (0.27) fluctuated between 0.12 (dynamic friction coefficient) and 0.35 (static friction coefficient). The fretting-wear results estimated via numerical prediction were consistent with the experimental results. When sm (vibration amplitude) was 20, 35, and 50 µm, the most difference in the fretting wear between the experimental results and numerical estimation was 0.001, 0.0007, and 0.001 mm, respectively. Therefore, the proposed model provides a method for accurate estimation of the fretting-wear. Additionally, the model contributes to the precise design of involute spline couplings in aerospace.

The Simulation Research of Dual Clutch Transmission's Starting Process Based on Dynamic Friction Coefficient

2013 ◽  
Vol 401-403 ◽  
pp. 320-325
Author(s):  
Ming Ming Qiu ◽  
Han Zhao ◽  
Fa Ming Sha
Keyword(s):  
Friction Coefficient ◽  
Vibration Analysis ◽  
Working Condition ◽  
Static Friction ◽  
Dynamic Friction ◽  
Simulation Research ◽  
Static Friction Coefficient ◽  
Dynamic Friction Coefficient ◽  
Friction Plate ◽  
Starting Process

Introduce the dynamic friction coefficient of clutch friction plate. Establish Mathematical model of starting process, carried out vibration analysis for frictional sliding process systematically, validated the analysis using Matlab/simulink software. Meanwhile, compared with the starting process by static friction coefficient. The results show that using dynamic friction coefficient to analyse starting process conforms to the actual working condition.

Investigation of the thermal property and tribological behavior of CaSO4 whisker-modified paper-based composite friction materials

2017 ◽  
Vol 231 (12) ◽  
pp. 1583-1594 ◽  
Author(s):  
Xiang Zhang ◽  
Ke-Zhi Li ◽  
He-Jun Li ◽  
Ye-Wei Fu
Keyword(s):  
Tribological Behavior ◽  
Three Dimensional ◽  
Friction Material ◽  
Dynamic Friction ◽  
Friction Materials ◽  
Paper Making ◽  
Dynamic Friction Coefficient ◽  
Secondary Layer ◽  
Surface Profiles ◽  
Dimensional Surface

In this study, CaSO4 whisker was applied to the paper-based composite friction material as the friction layer (secondary layer) by the paper-making process. The tribological and thermal properties were analyzed. Three-dimensional surface profiles were observed to discuss the wear mechanism. The results showed that the samples with higher CaSO4 whisker contents owned better thermal resistance. The sample with 4% CaSO4 whisker content had the highest dynamic friction coefficient. As the CaSO4 whisker content increased from 0% to 16%, the wear rate decreased first and then increased, and the sample with 8% CaSO4 whisker content had the highest wear resistance.

A Model for Study of Stick-Slip Vibrations in Caliper-Disc Brake Systems

2000 ◽  
Author(s):  
Glenn Meinhardt ◽  
Kambiz Farhang
Keyword(s):  
Friction Coefficient ◽  
Dynamic Properties ◽  
Equations Of Motion ◽  
Static Friction ◽  
Friction Material ◽  
Theoretical Treatment ◽  
Disc Brake ◽  
Vehicle Speed ◽  
Coupling Effects ◽  
Stick Slip

Abstract Friction-induced vibration in caliper-disc brake systems is examined using mathematical formulations based on the lumped-parameter approach. The theoretical treatment of the system considers the kinematic and dynamic properties of the caliper motion, accounting for the slider translation and flexure as well as rotational stiffness of the caliper assembly. In addition, compressive and shear properties of the friction material is included in the derivation of the model. The geometric and material/friction coupling effects are also included in the model. The geometric coupling effects arise from the kinematic nature of the caliper-disc brake system. The material/friction coupling effects are due to the compressive properties of the pad friction material leading to the determination of instantaneous pad/rotor average pressure and, thereby, its influence on the transmitted braking torque due to frictional contact. The coefficients of friction of the pad are represented by an exponential function (Larsson and Farhang, 1997) that describes the decay from the static friction coefficient to the kinetic friction coefficient as the relative velocity between the pad and rotor is increased. The resulting equations of motion are a set of second-order ordinary differential equations. Results are presented using an initial vehicle speed of 55 miles per hour.

Dynamics Research on Tape Feeder of Placement Machine

2010 ◽  
Vol 156-157 ◽  
pp. 203-206 ◽  
Author(s):  
Yong Shan Xiao ◽  
Zhen Yu Zhao ◽  
Fu Min Song
Keyword(s):  
Friction Coefficient ◽  
Great Influence ◽  
Static Friction ◽  
Prototype Model ◽  
Motor Torque ◽  
External Torque ◽  
Dynamic Friction Coefficient ◽  
Set Up ◽  
Placement Machine ◽  
The Impact

Based on multi-body dynamics, the virtual prototype model of the tape feeder is set up, and the impact of the external torque and the friction coefficient on the whole system is analyzed. Simulation results show that the external torque has great influence on the required motor torque: when the external torque increases from 50N.mm to 200N.mm, the required motor torque increases from 75.217N.mm to 223.98N.mm. The friction damping also has great influence on the motor torque: when the dynamic friction coefficient increases from 0.001 to 0.009 and the static friction coefficient increases from 0.003 to 0.011, the required motor torque increases from 106.92N.mm to 158.81 N.mm.

Synergistic effect of Steel Slag-Molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Sundarrajan D. ◽  
Pitchipoo Pandian ◽  
Manoharan Sembian
Keyword(s):  
Synergistic Effect ◽  
Peer Review ◽  
Molybdenum Disulfide ◽  
Steel Slag ◽  
Friction Material ◽  
Mechanical And Thermal Properties ◽  
Friction Materials ◽  
Content Type ◽  
Brake Pads ◽  
Industrial Standards

Purpose This paper aims to deal with the synergistic effect of steel slag-molybdenum disulfide particles on fade-recovery performances of non-asbestos organic friction material. Design/methodology/approach The brake friction materials were developed by using steel slag and molybdenum disulfide particles as individual and combination in the formulation. The brake friction materials were developed in the form of standard brake pads as per the industrial practice. The physical, mechanical and thermal properties of the developed brake pads were tested as per the industrial standards. The tribological properties were analyzed using the Chase test as per IS2742-Part-4. Worn surface analysis was done using a scanning electron microscope. Findings The experimental results indicate that the brake pads filled with a combination of steel slag and molybdenum disulfide showed stable friction and less wear rate due to the synergetic nature of abrasive and lubricant. Originality/value This paper explains the influence of steel slag and molybdenum disulfide particles as individual and combined in brake pads formulation to enhance the tribological performance by producing stabilized friction with undulations. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0216/

New Methodology for the Life Time Prediction of Wear Parts in the Mechatronic Systems

2017 ◽  
Vol 260 ◽  
pp. 194-201
Author(s):  
Oskars Linins ◽  
Irina Boiko ◽  
Janis Lungevics ◽  
Armands Leitans
Keyword(s):  
Friction Coefficient ◽  
Life Time ◽  
Static Friction ◽  
Engineering Calculation ◽  
Dynamic Friction ◽  
Mechatronic Systems ◽  
Time Prediction ◽  
Dynamic Friction Coefficient ◽  
Texture Parameters ◽  
3D Surface Texture

This paper is devoted to the elaboration and verification of the new methodology for the life time prediction of wear parts in the mechatronic systems. The methodology is based on the using of the 3D surface texture parameters instead of 2D roughness parameters for more precise prediction of the life time of machine parts.Experimental testing of proposed methodology for the wear parts of linear motion modules of mechatronic system was done using 3D profilometry, pin-on-disc tribological testing for determination dynamic friction coefficient, slidability and static friction coefficient measurements. The new approach for life time prediction is based on using following 3D texture parameters: Sa, Sq, Str, Rsm1 and Rsm2. It is established, that the amplitude and spatial parameters (Sa and Str (Rsm1) accordingly) have a most significant influence on the static and dynamic friction coefficient as well as on the sliding properties. It can be assumed, that for wear parts and for improving sliding properties the surfaces with less Sa and bigger Rsm1 are recommended.Within the Ti-based multi-layer PVD coatings the best prognosis for the life time was achieved for the samples with multi-layer Ti-TiN-Al PVD coating. Proposed methodology is acceptable for use in practice of engineering calculation, in design etc.

Influence of carbon nanotubes on the properties of friction composite materials

2019 ◽  
Vol 54 (16) ◽  
pp. 2101-2111
Author(s):  
Emad F EL-kashif ◽  
Shaimaa A Esmail ◽  
Omayma AM Elkady ◽  
BS Azzam ◽  
Ali A Khattab
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Tribological Properties ◽  
Smart Materials ◽  
Arc Discharge ◽  
Weight Ratio ◽  
Friction Material ◽  
Operating Conditions ◽  
Friction Materials

Carbon nanotubes have a lot of applications in mechanical fields. This is because nanomaterials have many superior mechanical properties such as very high strength-to-weight ratio, high modulus-to-weight ratio, high corrosion resistance, and super intelligence properties, which make them as smart materials. One of these attractive applications is the use of carbon nanotubes in vehicle brake friction material. Therefore, the fabrication and testing processes of these nanomaterials should be performed carefully to evaluate their mechanical, tribological, and noise properties. In this paper, friction material mixed with carbon nanotubes have been fabricated with different carbon nanotube contents and the same fabrication parameters. The carbon nanotubes have been produced using the conventional submerged arc discharge technique. The produced friction materials have been cut into pieces with standard sizes and then tested mechanically and tribologically. The results of tests have illustrated that the addition of carbon nanotubes into the friction materials could improve their mechanical properties (hardness, strength, and modulus) and also could enhance their tribological properties (wear rate and friction coefficient). Moreover, the tests showed that the presence of carbon nanotubes in friction materials could reduce the noise, vibration of the friction materials, and reduce the temperature rise due to the effect of friction, which means that the carbon nanotubes could raise the thermal conductivity of friction material, while the friction coefficient has stayed within the allowable standard limits (0.35–0.45). Surface morphology shows that the presence of carbon nanotubes in the friction materials could help to avoid surface friction cracks or fins within the normal operating conditions. The good combination of mechanical and tribological properties was obtained at 0.5% carbon nanotubes.

The Microstructure and Tribological Properties of Carbon Fibre Reinforced Carbon/SiC Dual Matrix Composites

2010 ◽  
Vol 434-435 ◽  
pp. 95-98 ◽  
Author(s):  
Xiao Peng ◽  
Li Zhuan ◽  
Xiong Xiang
Keyword(s):  
Friction Coefficient ◽  
Carbon Fibre ◽  
High Performance ◽  
Chemical Vapor ◽  
Static Friction ◽  
Chemical Vapor Infiltration ◽  
Three Dimension ◽  
Matrix Composites ◽  
Wear Rates ◽  
Dynamic Friction Coefficient

Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) are new type of high performance brake materials, and possess a series of outstanding advantages. In the present study, the C/C-SiC brake composites were fabricated by the combination of chemical vapor infiltration with liquid silicon infiltration. The fabric preforms were prepared by three dimension needling method. Results show the SiC form inside the short-cut fabric, around the needing fibre and among the fibre bundles in the non-woven web of the C/C-SiC composites. The average static friction coefficient of the C/C-SiC materials was 0.61. The average dynamic friction coefficient were between 0.41 and 0.54 with the increase of brake speed, and the wear rates are not sensitive to the brake speed and maintained about 0.02 cm3•MJ-1 all along.

Research on the Performance Influence of Second Adhesive to Friction Materials

2013 ◽  
Vol 461 ◽  
pp. 415-420
Author(s):  
Jie Peng ◽  
Yu Cheng Liu ◽  
Zhi Feng Yan ◽  
Bao Gang Wang ◽  
Fu Dong Lin ◽  
...  
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Friction Material ◽  
Molten State ◽  
Wear Performance ◽  
Friction Materials ◽  
Low Wear ◽  
The One ◽  
Better Than

The friction materials have many species and they are being used widely, but people have higher requests to friction materials along with the development of technology. the friction material of this expermental optimization formula have the advantages of suitable and stable friction coefficient under high temperature, low wear rate, good restoration characteristics and so on. It can effcetively reduce heat fade of friction and wear under high temperature barking. fricton and wear performance of friction material with second adhesive is better than common preparation friction material , it has higher friction coefficient and lower wear rate, It was determined by physical chemical properities of tin and sulfer. while heating or wearing, the temperature of friction material reach melting temperature of tin, it will become molten state, and sulfer has strong oxidation, on the one hand, tin and sulfer occurred chemical reaction, generating sulfide, stannous (one sulfide tin),on the other hand, while the sulfer is being molten state, it will absorb some abrasive dust, at the same time of generating sulfide, abrasive dust will be adsorb and solidify to pits of friction surface, forming abrasive dust membrane, let the friction coefficient of sample become stable rapidly, reducing the wear rate of friction material.

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