Studies Concerning Variation of the Friction Coefficient in Case of Polymeric Composite Materials Reinforced with Carbon Fibers

2013 ◽  
Vol 371 ◽  
pp. 343-347
Author(s):  
Radu Caliman
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Carbon Fibers ◽  
Polymeric Composite ◽  
Tribological Behaviour ◽  
Fiber Concentration ◽  
Rotating Speed ◽  
Mechanical And Tribological Properties ◽  
Pin On Disc

Thanks to their low density, good thermal, mechanical and tribological properties, composites made of carbon fibres and epoxy are particularly adapted to the manufacturing of aircraft brake discs. Several methods have been developed to improve their performance. The purpose of the present study was to evaluate the influence of different epoxy/carbon fibers ratio enhance modification on the friction behaviour and to identify the related mechanisms. Nine different hybrid matrix composites were elaborated. These samples were submitted to structural and mechanical characterization, then to friction and wear tests using a pin-on-disc tribometer, at ambient temperature and humidity, constant rotating speed, varying the loading pressure. As the content of carbon fiber increased, the wear rate of the composites trended to increase. Under the friction condition of high applied load, the friction coefficient inclined to decrease while wear rate increased. When slided under a relatively high load of 12 daN, the wear resistance behaved was better as the content of carbon fiber increased. The aim of the present study was to understand the friction mechanisms of these composites, dealing with the effects of varying the carbon fiber concentration within the matrix, not only on the tribological behaviour but also on the superficial mechanical properties.

scholarly journals Effect of Carbon Fiber Addition on Ceramic Reinforced Phenolic Resin Based Friction Composites

2010 ◽  
Vol 13 (1-2) ◽  
pp. 49
Author(s):  
L.M. Manocha ◽  
Guddu Prasad ◽  
S. Manocha
Keyword(s):  
Friction Coefficient ◽  
Carbon Fibers ◽  
Tribological Properties ◽  
Phenolic Resin ◽  
Inert Atmosphere ◽  
Lower Amount ◽  
Linear Speed ◽  
Mechanical And Tribological Properties ◽  
Micron Size ◽  
Pin On Disc

Carbon fibers have been used as additional reinforcing fibers to improve the mechanical and tribological properties of phenolic resin-based ceramic-carbon composites. The composites comprising ceramic particulates such as Silicon carbide, Boron carbide of 1-30 micron size as reinforcement and phenolic resin as matrix carbon precursor were prepared by compaction method followed by carbonization to 1000 °C in inert atmosphere. Experimental results indicate that carbonization results in decrease in thickness and weight, the amount of reduction increasing with addition of carbon fibers results in compact high density composites. Composites comprising of 10 wt. % fibers exhibited maximum hardness, compressive strength and density after  carbonization. Tribological properties of the composites were evaluated against Cr6 ball using a pin-on-disc Tribometer with different linear speed, sliding distance and load conditions. It was found that the composites filled with lower amount of carbon fibers showed relatively higher friction coefficient value. Also, it was noted that friction coefficient increases with increase in the applied load (1N, 2N and 5N) and linear speed.

Mechanical and Tribological Properties of Polyimide Composite Reinforced with Carbon Fibers and Carbon Nanotube

2011 ◽  
Vol 311-313 ◽  
pp. 189-192
Author(s):  
Rui Ya Rong ◽  
Zhen Hua Li ◽  
Yun Xuan Li ◽  
Chi Lan Cai
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Beneficial Effect ◽  
Carbon Fibers ◽  
Friction And Wear ◽  
Tensile Tests ◽  
Reinforced Composites ◽  
Mechanical And Tribological Properties ◽  
The Coefficient Of Friction

Reinforced polyimide composite with of carbon fiber and carbon nanotube were prepared by hot molding technology. The mechanical and friction and wear behaviors of the reinforced composites were studied. Tensile tests showed that SCF and CNT exhibit a beneficial effect for restoring the stiffness of the CF/PI composite. The carbon fiber reinforcement was found effective in reducing the coefficient of friction and the wear rate. This implied that the CNT improves the adhesion between SCF and PI.

Effect of Carbon Fiber Reinforcement on the Mechanical and Tribological Properties of PA6/PPS Composites

2012 ◽  
Vol 476-478 ◽  
pp. 2323-2327
Author(s):  
Shao Feng Zhou ◽  
Chao Qun Wu ◽  
Lian Hui Chen ◽  
Qiao Xin Zhang
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Impact Strength ◽  
Wear Rate ◽  
Tribological Properties ◽  
Elongation Rate ◽  
Polymer Materials ◽  
Mechanical And Tribological Properties ◽  
Practical Guidance ◽  
Different Content

The mechanical and tribological properties of PA6/PPS blend reinforced by different content of carbon fiber were studied in the manuscript. It was found that the strength, modulus and hardness of PA6/PPS blend is improved apparently though breaking elongation rate and impact strength decreases to some extent. Average friction coefficient value of the carbon fiber reinforced PA6/PPS (PA6/PPS-CF) composites at the state stage is lower than PA6/PPS blend and PA6/PPS-CF10% exhibits the lowest friction coefficient of 0.34. As the content of carbon fiber increases, wear rate of the PA6/PPS-CF composites trends to increasing. These results is useful for providing some practical guidance for the application of polymer materials in the tribological field.

Friction Coefficient and Wear Rate of Different Materials Sliding Against Stainless Steel

2013 ◽  
Vol 1 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Asaduzzaman Chowdhury
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Normal Load ◽  
304 Stainless Steel ◽  
Sliding Velocity ◽  
Stainless Steel 304 ◽  
Different Types ◽  
Pin On Disc ◽  
Ss 304

This paper examines the relation between friction/wear and different types of steel materials under different normal loads and sliding velocities and to explore the possibility of adding controlled normal load and sliding velocity to a mechanical process. In order to do so, a pin on disc apparatus is designed and fabricated. Experiments are carried out when different types of disc materials such as stainless steel 304 (SS 304), stainless steel 316 (SS 316) and mild steel slide against stainless steel 304 (SS 304) pin. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities are investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. The obtained results reveal that friction coefficient decreases with the increase in normal load for all the tested materials. It is also found that friction coefficient increases with the increase in sliding velocity for all the materials investigated. Moreover, wear rate increases with the increase in normal load and sliding velocity. At identical operating condition, the magnitudes of friction coefficient and wear rate are different for different materials depending on sliding velocity and normal load.

Effect of Regimes of Anode Plasma Electrolytic Carburizing on Tribological Properties of Titanium Alloy VT 20

2016 ◽  
Vol 844 ◽  
pp. 133-140 ◽  
Author(s):  
Mariya R. Komissarova ◽  
Ilia G. Dyakov ◽  
Yurii P. Gladii
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Titanium Alloys ◽  
Wear Behavior ◽  
Untreated Sample ◽  
X Ray ◽  
Pin On Disc ◽  
Anode Plasma ◽  
Plasma Electrolytic

Microhardness, friction coefficient, and wear rate of carburized titanium alloy VT 20 are considered. An X-ray diffractometer, a scanning electron microscopy (SEM) used to characterize the phase composition of the modified layer and its surface morphology. A pin-on-disc tribometer was occupied to evaluate wear behavior of the treated titanium alloys. It is established that the friction coefficient decreases from 0.46 (untreated sample) to 0.15 for the sample carburized at 750 °C during 5 min. Therefore, the anode carburizing of titanium alloys results in the reducing of the wear rate by 2 orders.

EVALUATION ON THE TRIBOLOGICAL PROPERTIES OF DOUBLE FRACTIONATED PALM OLEIN AT DIFFERENT LOADS USING PIN-ON-DISC MACHINE

2015 ◽  
Vol 75 (11) ◽  
Author(s):  
N. Nuraliza ◽  
S. Syahrullail ◽  
M.N. Musa
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Palm Olein ◽  
Pure Aluminum ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Hydraulic Oil ◽  
Before And After ◽  
Pin On Disc

The use of vegetable oil-based lubricant as a lubricant in various applications has increased and it is eyed by the industry due to its superior tribological properties, besides possessing the potential to replace petroleum-based lubricants. Palm olein is one of alternative lubricants that could be suitable and attractive as a lubricant to be studied due to its advantages and large production in the country. Thus, in this study, the behavior of palm olein characteristics was investigated by using pin-on-disc experiment, in which a hemispherical pin was loaded against the rotating grooved disc. The experiments via sliding were performed with pin-on-disc tester using pure aluminum as the material for hemispherical pin and SKD11 for disc. The test was implemented by dropping continuous flow of palm olein as lubricating oil on sliding surface at different loads applied, which were 10N, 50N, and 100N. The wear rate of the pin and the friction coefficient were also investigated. Moreover, the surface roughness before and after the experiment was analyzed as well. All the results obtained were compared to hydraulic oil and engine oil-SAE 40. From the analysis, the friction coefficient acquired from lubricated with palm olein was the lowest for both conditions. The wear rate obtained for the three lubricants increased from 10N to 100N load for palm oil, but decreased for hydraulic and engine oil-SAE 40. Meanwhile, the wear rate obtained for lubrication with hydraulic oil showed the lowest value compared to Engine oil-SAE 40 and double fractionated palm olein. 

Prediction of Wear Rate Dispersion in Mixed Lubrication

2005 ◽  
Author(s):  
F. Robbe-Valloire ◽  
R. Progri ◽  
B. Paffoni ◽  
R. Gras
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Boundary Lubrication ◽  
Mixed Lubrication ◽  
Tribological Behaviour ◽  
Low Friction ◽  
Local Boundary ◽  
Physico Chemical ◽  
Lubricant Films ◽  
Second Category

Mixed lubrication is usually related to the partition of contacts, and these latter may be divided into two categories. The first includes all asperities working in thin lubricated film (physico-chemical film) conditions. This situation corresponds to local boundary lubrication and is characterised by a local friction coefficient around 0.1. The second category contains all other asperity types. Due to the existence of a thick lubricant films asperities belonging to the second category exhibit a low friction coefficient. The global tribological behaviour for a given contact, however, is function of both categories, since it involves asperities from both categories.

Modification of the Titanium Surface Layer by the Yttrium

2015 ◽  
Vol 1085 ◽  
pp. 63-67
Author(s):  
Yurii F. Ivanov ◽  
Natalja Popova ◽  
Mark Kalashnikov ◽  
Victor Gromov ◽  
Evgeniy Budovskih ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electron Beam ◽  
Phase Composition ◽  
Friction Coefficient ◽  
Wear Rate ◽  
High Intensity ◽  
Titanium Surface ◽  
Mechanical And Tribological Properties ◽  
Modified Layer ◽  
Combined Technique

Modification of a titanium surface layer with yttrium using the combined technique of electroexplosive doping and the subsequent irradiation by a high-intensity electron beam is carried out. The studies on the structure, the element and the phase composition, mechanical and tribological properties of the doped layer are carried out. Formation of a multiphase submicron-nanocrystalline eutectic is revealed. A multifold increase in the microhardness, a decrease in the friction coefficient and the wear rate of the modified layer is established.

Studies Regarding the Influence of Loading Force on the Wear Intensity in Case of Polymeric Composite Materials Reinforced with Short Carbon Fibers

2014 ◽  
Vol 1036 ◽  
pp. 36-39
Author(s):  
Radu Caliman
Keyword(s):  
Composite Materials ◽  
Carbon Fibers ◽  
Research Work ◽  
Polymeric Composite ◽  
Wear Intensity ◽  
Tantalum Carbide ◽  
Carbon Fibres ◽  
Polymeric Composite Materials ◽  
Pin On Disc ◽  
Short Carbon

This paper presents a study of the wearing behaviour of polymeric composite materials reinforced with short carbon fibres. Reinforces carbon fiber materials are more effective if refer to specific properties per unit volume compared to conventional isotropic materials. The composite materials used in this research work are obtained combining epoxy with short carbon fibres with titanium carbide and tantalum carbide in order to investigate the wearing intensity of the obtained composites. Varying the percent of epoxy from 29,35% to 43,92% and the percent of short carbon fibres from 35,43% to 53,70%, two different composite materials are obtained and tested. Wearing intensity tests are carried out, at room temperature, in dry conditions, on a pin-on-disc machine. The friction coefficient was measured maintaining constant the rotational speed (14 m/s) and time (120s) and varying the pin-on-disc pressing force: 4, 8 and 12 daN. The pressing load had different effects on the wearing behaviour of the composite coating in dry friction condition. With low percent of epoxy and high percent of carbon fibers the wearing intensity is touching the highest value and gradually decreases with the increasing load, while in low percent of carbon fibers the wearing intensity became larger gradually along with the load increasing.

Characterization of the Interphase in Carbon Fiber Reinforced Polymeric Composite by a Modulus Mapping Test

2013 ◽  
Vol 586 ◽  
pp. 253-256
Author(s):  
Zbyněk Sucharda ◽  
Tomas Suchy ◽  
Radek Sedláček ◽  
Karel Balik ◽  
Josef Šepitka ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
Matrix Composite ◽  
Structural Integrity ◽  
Polymeric Composite ◽  
Nanoindentation Test ◽  
Fiber Reinforced ◽  
Steam Sterilization ◽  
Interphase Region

The effect of sterilization on the structural integrity of the polydimethylsiloxane (PDMS) matrix composite reinforced with carbon fibers (CF) is investigated by nanoindentation test. We present the investigation of the influence of sterilization processes on fiber/matrix interphase properties. The effect of multiple widely-used steam sterilization processes on fibers/matrix interphase region properties was studied by modulus mapping test.

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