Plastics � Determination of abrasive wear by reciprocating linear sliding motion

2020 ◽  
Keyword(s):  
Abrasive Wear ◽  
Sliding Motion

High-Temperature High-Speed Tribometer With Complex Motion

2005 ◽  
Author(s):  
Hooshang Heshmat ◽  
Michael J. Tomaszewski ◽  
Crystal Heshmat ◽  
James F. Walton ◽  
Said Jahanmir
Keyword(s):  
Friction Force ◽  
High Speed ◽  
Advanced Materials ◽  
Sliding Motion ◽  
Force Transducers ◽  
Contact Loads ◽  
Wide Range ◽  
Directional Motion ◽  
Pin On Disk

Complex motions and wide variations in relative surface velocities are likely to be experienced in mechanical systems such as an engine (e.g., piston rings, wrist pins and crankshaft main bearings in a piston type engine). Currently available tribometers use simple motions and often a constant speed. A new tribometer is designed with the capability of three types of motions: (1) unidirectional rotary motion (similar to a conventional pin-on-disk tribometer), (2) reciprocating sliding motion, and (3) complex multi-directional motion that can be achieved when the disk rotates and the pin reciprocates along a linear path. Depending on the pin location with respect to the center of the disk, the reciprocation frequency, and the rotational speed of the disk, a wide range of complex motions are possible. Tribological testing can be performed at contact loads up to 400 N, at speeds up to 80m/s, and temperatures of 600 °C in superheated steam. Due to complex motions, the measurement of friction force becomes challenging. To properly monitor the normal force and the friction force along two orthogonal axes, three force transducers are used. This unique design allows for the determination of tribological performance of advanced materials and coatings under conditions that simulate those encountered in small steam engines currently under development.

ABRASIVE WEAR MECHANISMS OF ANTIWEAR COATINGS IN BALL-CRATERING TESTS

Tribologia ◽  
2016 ◽  
Vol 270 (6) ◽  
pp. 95-106
Author(s):  
Edyta OSUCH-SŁOMKA
Keyword(s):  
Abrasive Wear ◽  
Surface Coating ◽  
Boundary Surface ◽  
Work Conditions ◽  
Pvd Coatings ◽  
Repetitive Nature ◽  
Microscopic Techniques ◽  
Selection Of ◽  
Scanning Electron

The article is a continuation of research on the mechanisms of wear on PVD coatings observed after tests had been performed with the use of the ball-cratering method evaluating the wear. The work conditions of friction point in which tribological tests had been performed were calculated based on the optimization experiments described in independent studies [L. 1–2]. The aim of the article is to analyse the boundary surface coating–substrate resulting from abrasive wear. The observed area is located on the border of the trace of wear in the shape of a crater, at the point of the exit of the ball from the trace in accordance with the direction of the selection of the coating. The tested surface was observed with the use of microscopic techniques: scanning electron microscope (SEM) and interferometric microscope (WLI). The authors attempted to present the repetitive nature of the mechanism of the wear of thin PVD coatings with the use of the ball-cratering method, including its influences on receiving repeated traces of wear, which, in turn, has an influence on the determination of a reproducible value of the wear rate Kc, which is the factor determining the resistance of the tested coating to abrasive wear.

Determination of the influence of structural parameters of steels on their abrasive wear resistance

2021 ◽  
pp. 50-54
Author(s):  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Computer Program ◽  
Abrasive Wear ◽  
Structural Parameters ◽  
Extreme Temperature ◽  
Abrasive Wear Resistance ◽  
Thermal Hardening ◽  
Heat Treated

Relationships are established between the parameters of the structure of heat-treated steels and their abrasive wear resistance. A computer program is developed for the choice of material and methods of thermal hardening in order to ensure the required wear resistance. Keywords: heat treatment, dislocation density, extreme temperature, lowalloy steel, computer program. [email protected]

Experimental Studies on Abrasive Wear of Surface-Hardened and Shot Peened Alloy Cast Steels

2016 ◽  
Vol 674 ◽  
pp. 201-206
Author(s):  
Andrzej Norbert Wieczorek
Keyword(s):  
Abrasive Wear ◽  
Cast Steel ◽  
Experimental Studies ◽  
Operating Conditions ◽  
Linear Wear ◽  
Plastic Properties ◽  
Cast Steels ◽  
Wear Tests ◽  
Alloy Cast

The paper presents the results of wear tests of shot-peened and non-shot-peened cast steels with the use of an especially designed test rig simulating real operating conditions of chain wheels. The chain wheels subjected to tests were operated with the use of loose quartz abrasive. The studies involved the determination of strength and plastic properties, hardness distributions, microstructure and linear wear of the selected cast steels. Based on the results obtained, the following was found: the abrasive wear of cast steel chain wheels increased after shot peening.

scholarly journals Prediction of oil-film thickness and shape in elliptical point contacts under combined rolling and sliding motion

2000 ◽  
Vol 214 (5) ◽  
pp. 427-437 ◽  
Author(s):  
D Jalali-Vahid ◽  
H Rahnejat ◽  
R Gohar ◽  
Z. M. Jin
Keyword(s):  
Point Contact ◽  
Rolling Element Bearings ◽  
Point Contacts ◽  
Practical Applications ◽  
Sliding Motion ◽  
Numerical Predictions ◽  
Local Point ◽  
Rolling Element ◽  
Raphson Method

The paper presents a numerical solution for elliptical point contact conjunctions under combined rolling and sliding motion. This condition is prevalent in many practical applications, such as rolling element bearings and conformal gears. An effective influence Newton-Raphson method is employed in local point distributed or global line distributed low-relaxation iterations. This method enables determination of the pressure distribution and film shape at high loads such as are encountered in many practical applications. Some of the numerical predictions have been validated against experimental results.

Determination of basic factors affecting the abrasive wear of pipes

1986 ◽  
Vol 28 (3) ◽  
pp. 214-216 ◽  
Author(s):  
Yu. G. Solov'ev ◽  
P. M. Yushkevich ◽  
N. P. Bondar' ◽  
N. V. Kravchenko
Keyword(s):  
Abrasive Wear ◽  
Factors Affecting

Determination of Resistance to Abrasive Wear. VII. Uniformity of Results Obtained with the Du Pont Machine

1948 ◽  
Vol 21 (1) ◽  
pp. 257-261
Author(s):  
J. F. Morley ◽  
J. R. Scott
Keyword(s):  
Abrasive Wear ◽  
Left Hand ◽  
Emery Paper ◽  
Solid Disc ◽  
The Right ◽  
Right And Left Hand

Abstract (1) Tests have been made to investigate the variability of the abrasive papers used on the du Pont abrasion machine; the data obtained have also been examined to detect any variation in rate of abrasion during one test, and differences between the right- and left-hand specimens. (2) Differences in abrasiveness of 13 per cent were found between the different sheets of emery paper, even when compared with the differences between the rubber specimens, and it is considered that a solid disc of bonded abrasive, as used on the Akron machine, would be preferable to emery papers. (3) As there is no evidence of variation in rate of abrasion during a 20-minute run, there seems to be no objection to using different test-periods for different rubbers if circumstances render this desirable. (4) There are small, but not consistent, differences between the abrasion losses on the right- and left-hand specimens, which may arise from the 8-lb. load not being equally distributed between them. It is considered that the machine could be improved by making the arm that carries the specimens free to oscillate in a plane perpendicular to the abrasive, so that the loads on the specimens would be automatically equalized. The practice of rigidly fixing the arm parallel to the plane of the abrasive seems unsound because, if the parallelism were really rigid, the rates of wear on the two specimens would of necessity be equal, even if the rubbers had different abrasion resistances. Moreover, any suggestion to test the sample under examination and a standard rubber simultaneously is clearly unsound unless a freely oscillating arm is provided.

Determination of Resistance to Abrasive Wear. V. Influence of Calender Grain

1948 ◽  
Vol 21 (1) ◽  
pp. 254-256
Author(s):  
R. W. Parris ◽  
J. R. Scott
Keyword(s):  
Abrasive Wear ◽  
Test Piece ◽  
Flat Surface ◽  
Testing Machine ◽  
Standard Form ◽  
Magnesium Carbonate ◽  
Actual Use ◽  
Cutting Out ◽  
Abrasion Testing

Abstract The standard form of test-piece used on the type of abrasion testing machine of the Akron Standard Mold Company is a disc of about 63.5 mm. diameter and 12.5 mm. thick. This can be made either (1) by vulcanizing in a mold of appropriate shape, which is filled with a blank cut from a sheet of stock about 13 mm. thick, or (2) by cutting out from a mold-vulcanized slab 12.5 mm. thick. In either case the abrasive wear takes place on a surface corresponding to the edge of a disc cut from the sheet of stock. The same is true if tests are made on discs cut from rubber articles such as soles, flooring, or other material in sheet form. In the actual use of such articles as tires, soles and heels flooring, conveyor belting, and tough rubber cable sheaths, the abrasive wear occurs on a surface representing substantially the flat surface of the sheet of stock. If the stock contains fillers that produce a calender grain effect, e.g., magnesium carbonate and clay, it cannot be assumed that the wear on the flat surface of the sheet is the same as that on the edge of a disc cut from it, which lies in a plane perpendicular to the former surface. If there is a difference between the rates of wear on these two surfaces, the type of test-piece described above must give an incorrect indication of the abrasion resistance of the rubber in actual use.

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