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 resulting wear scar on the block can be measured using a 3D microscope. A calibrated ocular or a photomicrograph of known magni? Statically applied loads shall be kept constant within a maximum deviation of A fresh supply of lubricant shall be used for each test astn the objective is to evaluate the effects of used lubricants on friction and wear.

Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. Link to Active This link will always route to the current Active version of the standard.

G — 02 and root-mean-square surface roughness. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

The length of the track can be adjusted prior to the start of measurement. Bath temperature shall be controlled to within a maximum deviation of Generally, in calculating wear adtm of the? 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.


Kinetic friction coefficient can be calculated from: 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. Friction coefficient is accurately measured during the test by the g13 of, the easy and quick to calibrate, load cell. Wear rates for the tip and the sample are calculated from the volume of material lost.

As is often the case for wear tests, the within-laboratory repeatability is better than the between-laboratory reproducibility. Friction force and normal force data are measured to obtain the coefficient of friction.

RFG Petro Systems

NOTE 2—This procedure requires full-immersion lubrication. If neither procedure in 8. 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.

This variation is to be expected. Use of a spherical tip alleviates the alignment problems associated with?

Linear Reciprocating (ASTM G)

The ball specimen experiences nominally constant contact, whereas the? If procedures other than A or B are used, the report should explicitly state so, listing the conditions which are different than those described in 8. Summary of Test Method 4.


Multiple sensors, automated test procedures, modularity, easy interchangeability of test setups, and data analyzing capability make the tribometer a key instrument for the automotive industry. Warning—It is not recommended that continuous wear depth data obtained from position-sensing gages be used aatm of the possible complications arising from entrapped debris, thermal expansion due to frictional heating, hydrodynamic lift, and tribochemical? The velocity of movement follows a sine wave with maximum speed in the middle of the track.

Universal Mechanical Testers for Tribology Testing in the Automotive Industry

To determine the change in wear rate with test duration, interrupted tests with periodic wear volume assessments may be made. Refer to the following which applies. NOTE 4—Quantities which have been measured on the same lot used for fabricating wear test specimens should be distinguished from those obtained on other lots of material or handbook values and assumed to apply to the given test specimens.

On the printed pro? Deviations from the prescribed cleaning procedure are permitted, but they shall be described in the report. It is possible that during mounting, some contamination was inadvertently placed on them, and this? This test method encompasses both unlubricated and lubricated testing procedures.