scholarly journals Effects of break in period on the 4-ball wear tests using molybdenum disulphide (MoSշ) as EP additives in lithium based grease

2020 ◽  
Vol 51 ◽  
pp. 16-22
Author(s):  
Gabi Nehme ◽  
Sara El-Merhabi ◽  
Saeed Ghalambor
Keyword(s):  
Molybdenum Disulphide ◽  
Wear Tests

scholarly journals Al6061 Hybrid Metal Matrix Composite Reinforced with Alumina and Molybdenum Disulphide

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
G. Pitchayyapillai ◽  
P. Seenikannan ◽  
K. Raja ◽  
K. Chandrasekaran
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Metal Matrix ◽  
Weight Ratio ◽  
Stir Casting ◽  
Wear Behaviour ◽  
Depth Of Cut ◽  
Molybdenum Disulphide ◽  
Hybrid Metal Matrix Composite ◽  
Wear Tests

Aluminum Hybrid Reinforcement Technology is a response to the dynamic ever-increasing service requirement of industries such as transportation, aerospace, automobile, and marine, due to its attractive properties like high ductility, highly conductivity, light weight, and high strength to weight ratio. In this evolution, an attempt has been made to investigate the wear rate of Al6061 hybrid metal matrix composite reinforced with the hard ceramic alumina (4, 8, and 12 wt.% of Al2O3) and soft solid lubricant of molybdenum disulphide (2, 4, and 6 wt.% of MoS2) is fabricated by using stir casting method. The unlubricated pins on disc wear tests were conducted to examine the wear behaviour of Al6061/12 wt.% of Al2O3/MoS2composites. The sliding wear tests were carried out at various loads of 15, 30, and 45 N, sliding velocity (1.25, 2.50, and 3.25 m/sec), and different MoS2 wt.% (2, 4, and 6 wt.%). In addition, the CNC turning experiments were conducted on Al6061/12 wt.% Al2O3/6 wt.% MoS2using CNMG 120408 uncoated carbide cutting tool under cutting of 100, 150, and 200 m/min, feed of 0.1, 0.2, and 0.3 mm/rev, and depth of cut of 1, 1.5, and 2 mm.

Average Worn Profile of Tires in Europe

2014 ◽  
Vol 42 (3) ◽  
pp. 166-184 ◽  
Author(s):  
Frédéric Biesse ◽  
Jérôme Mahé ◽  
Nicolas Lévy
Keyword(s):  
End Of Life ◽  
Development Process ◽  
Measurement Process ◽  
European Countries ◽  
Analysis Method ◽  
Wear Performance ◽  
Usual Behavior ◽  
Wear Tests ◽  
Pattern Width

ABSTRACT Tire tread wear is a key issue in the tire development process and for tire customers. In order to measure the wear performance, tire manufacturers usually proceed to wear tests and calculate the tire life from those tests. An important point in this tire life computation is the criteria chosen for defining the tire's end of life. In Europe, there is a legal minimum tread depth set to 1.6 mm applicable to 75% of the tread pattern width. However, outside those 75% (i.e., on the shoulder part), no clear and shared limit is defined. Also, the usual behavior of customers to decide when their tires should be changed is not well known. The goal of this 2012 study was to identify an average worn profile of tires in Europe and the behavior of customers for replacing their tires. For that, 3000 tires worn out by customers have been collected in scrapyards and measured in five European countries. In this article, we will present the tire collecting method, the measurement process, the analysis method, and some general results and statistics on this 3000 tire database. Finally, the method to compute the average end of life profile and the resulting profile is given.

scholarly journals Thermo-mechanical forging of 708M40 steel ring samples: experiments and modelling

2021 ◽  
Author(s):  
Steven Hill ◽  
Richard P.Turner
Keyword(s):  
Finite Element ◽  
Experimental Parameter ◽  
Compression Tests ◽  
Molybdenum Disulphide ◽  
Heating Unit ◽  
Modelling Framework ◽  
Process Understanding ◽  
Ring Compression ◽  
Water Based ◽  
Temperature Variable

AbstractA series of ring compression tests using BS970:708M40 alloy steel samples were studied. These tests were conducted using a 2-factor soak-temperature variable, namely 1030 °C and 1300 °C, and a 4-factor lubricant variable consisting of unlubricated samples, synthetic water-based, graphite water-based, and graphite and molybdenum disulphide viscous grease. The lubricant agents were all applied to the tool/billet interface. Process variables such as blow force and heating were controlled with the use of a gravitationally operated drop hammer and an automated programmable induction-heating unit. This matrix of the experimental parameters offered a sound base for exploring dominant factors impacting upon bulk deformation. This deformation was measured using fully calibrated equipment and then systematically recorded. A finite element modelling framework was developed to further improve the thermo-mechanical deformation process understanding, with finite element (FE) predictions validated through experimental measurement. Through the combined experimental and FE work, it was shown that temperature variation in the experimental parameter matrix played a larger role in determining deformation than the lubrication agent. Additionally, the use of synthetic and graphite water-based lubricants does not necessarily produce greater deformation when used in high-temperature forgings due to the lubricants breaking down, evaporating, or inducing rapid billet cooling as a result of the carrier used (water). Graphite-molybdenum disulphate grease far outperforms the other lubricants used in this trial in reducing friction and allowing deformation to occur across a die-face.

scholarly journals Dry Sliding Behavior of an Aluminum Alloy after Innovative Hard Anodizing Treatments

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3281
Author(s):  
Chiara Soffritti ◽  
Annalisa Fortini ◽  
Anna Nastruzzi ◽  
Ramona Sola ◽  
Mattia Merlin ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Aluminum Substrate ◽  
Dry Sliding ◽  
Aluminum Oxides ◽  
Wear Rates ◽  
Anodic Aluminum ◽  
Hard Anodizing ◽  
Pin On Disc ◽  
Diffuse Reflectance Infrared ◽  
Wear Tests

This work evaluates the dry sliding behavior of anodic aluminum oxides (AAO) formed during one traditional hard anodizing treatment (HA) and two golden hard anodizing treatments (named G and GP, respectively) on a EN AW-6060 aluminum alloy. Three different thicknesses of AAO layers were selected: 25, 50, and 100 μm. Prior to wear tests, microstructure and mechanical properties were determined by scanning electron microscopy (VPSEM/EDS), X-ray diffractometry, diffuse reflectance infrared Fourier transform (DRIFT-FTIR) spectroscopy, roughness, microhardness, and scratch tests. Wear tests were carried out by a pin-on-disc tribometer using a steel disc as the counterpart material. The friction coefficient was provided by the equipment. Anodized pins were weighed before and after tests to assess the wear rate. Worn surfaces were analyzed by VPSEM/EDS and DRITF-FTIR. Based on the results, the GP-treated surfaces with a thickness of 50 μm exhibit the lowest friction coefficients and wear rates. In any case, a tribofilm is observed on the wear tracks. During sliding, its detachment leads to delamination of the underlying anodic aluminum oxides and to abrasion of the aluminum substrate. Finally, the best tribological performance of G- and GP-treated surfaces may be related to the existence of a thin Ag-rich film at the coating/aluminum substrate interfaces.

scholarly journals Enzymatic identification of the load-bearing boundary lubricant in the joint.

Rheumatology ◽  
1998 ◽  
Vol 37 (2) ◽  
pp. 137-142 ◽  
Author(s):  
B A Hills ◽  
M K Monds
Keyword(s):  
Water Soluble ◽  
Surprising Result ◽  
Lubrication System ◽  
Load Bearing ◽  
Bovine Articular Cartilage ◽  
Boundary Lubricant ◽  
Surface Active ◽  
Per Se ◽  
Dose Dependent ◽  
Wear Tests

Abstract Bovine articular cartilage and synovial fluid (SF) were co-incubated with one of three enzymes selected to destroy each of the three major contenders for the active ingredient imparting such remarkable load-bearing lubrication to the normal joint. Destroying hyaluronic acid (HA), alias hyaluronan, with hyaluronidase, both frictional and wear tests displayed no significant change in accordance with most previous studies of SF alone. Destroying surface-active phospholipid (SAPL) with phospholipase A2, there was a highly significant dose-dependent compromise of lubrication as recorded on both tests. Trypsin produced a somewhat surprising result in that lubrication of the cartilage actually improved. This result can be interpreted as indicating that lubricin is not the lubricant per se, but, as a water-soluble, macromolecular, proteinaceous carrier for phospholipid, its destruction caused more SAPL to be deposited as the true load-bearing lubricant. These results are discussed in the context that SAPL, lubricin and HA each have specific roles in a comprehensive lubrication system.

Lubricants based on molybdenum disulphide

1959 ◽  
Vol 36 (7) ◽  
pp. 333-333
Author(s):  
Rocol Ltd.
Keyword(s):  
Molybdenum Disulphide

On data dispersion in pin-on-disk wear tests

Wear ◽  
2002 ◽  
Vol 252 (11-12) ◽  
pp. 1001-1006 ◽  
Author(s):  
S Guicciardi ◽  
C Melandri ◽  
F Lucchini ◽  
G de Portu
Keyword(s):  
Pin On Disk ◽  
Wear Tests

Molybdenum Disulphide

1959 ◽  
Vol 11 (4) ◽  
pp. 32-36
Author(s):  
C.J.C. Vineall ◽  
Alan Taylor
Keyword(s):  
Molybdenum Disulphide

Mathematical Model of the Sintering Process of Iron-Copper Bearings

2007 ◽  
Vol 23 ◽  
pp. 119-122
Author(s):  
Cristina Teișanu ◽  
Stefan Gheorghe ◽  
Ion Ciupitu
Keyword(s):  
Experimental Data ◽  
Mechanical Properties ◽  
Mathematical Model ◽  
Regression Analysis ◽  
Function Optimization ◽  
Chemical Compositions ◽  
Sintering Process ◽  
Molybdenum Disulphide ◽  
Iron Copper ◽  
Antifriction Properties

The most important features of the self-lubricating bearings are the antifriction properties such as friction coefficient and wear resistence and some mechanical properties such as hardness, tensile strength and radial crushing strength. In order to improve these properties new antifriction materials based on iron-copper powders with several additional components (tin, lead and molybdenum disulphide) have been developed by PM techniques. To find the optimal relationship between chemical compositions, antifriction and mechanical properties, in this paper a mathematical model of the sintering process is developed, which highlighted the accordance of the model with data by regression analysis. For the statistical processing of the experimental data the VH5 hardness values of the studied materials were considered. The development of mathematical model includes the enunciation of the model, the establishment of the performance function (optimization) and the establishment of the model equations and verifying. The accordance of the model with experimental data has been highlighted by regression analysis

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