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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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.
For example, crankshafts and camshafts have critical requirements for proper functioning aztm diverse service conditions.
To measure the wear, it is necessary to clean the specimens in such a way that the surface features are not altered. Nominal friction coefficient values were obtained from chart recordings of the root-mean-square friction force.
Use of a spherical tip alleviates the alignment problems associated with? The method of sensing and recording friction force during the test shall be described in the testing report.
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.
NOTE 3—Various methods have been used to measure the wear volumes of non-? In this test method, wear is reported only asgm the total volume lost after a set period of sliding. Friction force and normal force data are measured sstm obtain the coefficient of friction. A flat, pin or ball tip is loaded onto a test sample with a precise weight. Wear rates for the tip and the adtm are calculated from the volume of material lost. Eo is obtained from: If a cycle-counter is available, this may be used instead of the timer, in which case Eq 2 will be used.
This avoids making the assumption that the wear rate was constant during the test. The ASTM G test method uses a reciprocating sliding arrangement to simulate the type of oscillating contact that occurs between a piston ring and its mating cylinder bore surface near the top-dead-center position in the cylinder where the most severe surface contact conditions occur Figure 2.
The scope of this test method does not include testing in corrosive or chemically aggressive environments.
Universal Mechanical Testers for Tribology Testing in the Automotive Industry
Work Item s – proposed revisions of this standard. G313 involving proprietary materials are speci? The load, stroke length, frequency of oscillation, temperature, condition of lubrication, and test duration are selected from one of the two procedures see Table. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Humidity can vary with air?
The ball is rigidly mounted and has a spherical tip which moves back and forth across the surface of a polished? A calibrated ocular or a photomicrograph of known magni? For unlubricated tests, a concentrated jet of air may be used to dispel the debris from the worn area of the specimens.
If a bearing ball is used, it shall be clamped tightly enough to prevent slippage during the test.
Linear Wear Friction Testing ASTM G
In most cases, the width and depth of the wear scar on the? A commercial version of this machine is available with a signal conditioner to rectify, and output the root-mean-square friction force to a strip-chartrecorder or to a computerized data acquisition system.
If a lubricant is asstm, provide its commercial name or other description, and any other properties needed to identify the source and traceability of the lubricant.
Link to Active This link will always route to the current Active version of the standard. The coefficient of variation of the wear volume of the? Other tests, such as those for door handles and lock mechanisms, include evaluation of different base materials, heat treatment conditions, surface coatings, and lubricants. Also, report any unusual frictional behavior, as indicated in Two wear tests were performed on each?
Any ball movement within the holder during the test invalidates the test results. This test method encompasses both unlubricated and lubricated testing procedures. Generally, in calculating wear volume of the? G — 02 friction forces generated during sliding.
Either of two sets of testing conditions designated Procedures Atm and B may be used. Universal mechanical testers UMTs that are able to perform multiple tests in a single platform with interchangeable modules can help manufacturers meet test specifications quickly and economically.
Refer to the following which applies.
Linear Reciprocating (ASTM G133)
Tests include evaluation of base materials, heat-treated parts, surface coatings, and lubricants. A spread sheet computer software package designed for Guide G was used to process test data on steady-state friction coefficient and the computed wear volumes? New fuel cell concept brings biological design to better electricity Some materials wear evenly so as to produce clearly de?
All other provisions of Test Method G have been followed. Aatm New fuel cell concept brings biological design to better electricity This test is also applicable to addressing tribological concerns for engine valve stems and rollers, including measurement of hardness and modulus of valve material, and wear tests on the valve and cylinder head interface.