The linear wear test, ASTM G, reproduces the linear reciprocating motion found in many real-world tribology mechanisms. ASTM G – Designation: G – 02 Standard Test Method for Linearly Reciprocating Ball-on-Fla. ASTM G – – Download as PDF File .pdf), Text File .txt) or read online. ASTM G –

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The range of relative humidities over which pronounced changes in tribological behavior occur may be relatively short and it may vary between materials. The ASTM G test method utilizes a flat lower specimen and a ball-shaped upper counterpart that slides against the flat specimen Figure 1.

A statement such as the following may then be used: Stepper-type motors may also be used provided that the motion is smooth and uniform. The following equation may be used: For liquid-lubricated specimens, ultrasonic cleaning in a suitable solvent may be used. The flexibility of the UMT test platform to control multiple variables, including normal load, reciprocating speed, and stroke length, as well as to introduce environmental factors such as hot, cold, and humid conditions, enables a user to perform the widest range of possible experimentation.

UMTs offer interchangeable modules and the ability to program and control the application of complex forces and motions through servo-control. The height of the specimen or mount may require adjustment to ensure that this condition is ful? The load, stroke length, frequency of oscillation, temperature, condition of lubrication, and test duration are selected from one of the two procedures see Table.


The principal quantities of interest are the wear volumes of the contacting ball and? The coefficient of variation for the friction coefficient in the same tests was 1. Any ball movement within the holder during the test invalidates the test results.


G — 02 friction forces generated during sliding. It has been estimated that half or more of the friction losses in internal combustion engines occur at that interface, making friction tests of those areas critical.

Diamond, WC, Rubber and many other materials: Linear Wear Friction Process: NOTE 5—Friction force may vary during an experiment due to run-in and other factors. Run-in wear rates can exceed steady-state wear rates, and catastrophic transitions in wear rate can occur to end the useful life of a component.

Specimens shall be thoroughly dried. Warning—Due to inertial effects, differences in the loading and? Eight replicate tests were performed in one laboratory to evaluate the repeatability of this procedure. If the calculated contact stress exceeds the hardness of either material, there will be permanent plastic deformation and elastic conditions do not apply.

Since the repeatability and reproducibility of wear and friction data are material-dependent, a general statement for Procedures A or B cannot be made.

It should therefore not be assumed that the same relative wear volumes would be obtained if materials for ball and? In a polished condition, the surface should be as free as possible from preparation artifacts such as grinding-induced cracks, gross grinding marks, and grain pull-out.

ASTM G133 – 05(2016)

G — 02 and root-mean-square surface roughness. The method of sensing and ast friction force during the test shall be described in the testing report.

Link to Active This link will always route to the current Active version of the standard. A number in parentheses indicates the year of last reapproval. If a h133 is available, this may be used instead of the timer, in which case Eq 2 will be used. A provision is made for applying a uniform normal force load to the contact between the ball and the?

All other provisions of Test Method G have been followed. Similarly, any slippage of the? Deviations from the prescribed cleaning procedure are permitted, but they shall be described in the report. This website uses cookies to improve user experience. Either of two sets of testing conditions designated Procedures A and B may be used.


Users have the option to test against required industry standards, or to perform customized tests to gather accurate data for a wider array of analyses. If neither procedure in 8. In most cases, the width and depth of the wear scar on the?

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Photomicrographs of the scars should be included, if available. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. The wear resulting from this mode of movement may differ from that experienced by the same materials sliding continuously in only one direction unidirectional sliding even for comparable durations of contact.

In this test, a block is loaded from the top and pressed against a rotating ring. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.

Inspect the ball tip with a hand lens after it is mounted to ensure that there are no defects in the contact area. As the test starts, the tip creates a linear wear track zigzag pattern also possible. To measure the wear, it is necessary to clean the specimens in such a way that the surface features are not altered.

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