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 –
The principal quantities of interest are the wear volumes of the contacting ball and flat specimen materials; however, the coefficient of kinetic friction may also be measured using the method described. Wear test results are usually reported as the volume of material lost for the block.
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 standard ring is installed on the arbor, which rotates in the horizontal axis. Because of the integrated 16bit external position encoder, friction can be displayed for any specific point for each pass.
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.
Diamond, WC, Rubber and many other materials: Friction coefficient is accurately measured during the test by the deflection of, the easy and quick to calibrate, load cell. Electronic timers can be used to terminate the test.
Linear Reciprocating (ASTM G133)
Tests can be run with diverse loads, velocities, and temperatures that simulate actual service conditions using various lubricants and liquids. Warning—It is not recommended that continuous wear depth data obtained from position-sensing gages be used because of the possible complications arising from entrapped debris, thermal expansion due to frictional heating, hydrodynamic lift, and tribochemical?
Use of a spherical tip alleviates the alignment problems associated with? Either of two sets of testing conditions designated Procedures A and B may be used.
Appendix X1 provides examples of the repeatability and reproducibility of Procedures A and B when applied to tests of silicon nitride ceramics. These numerical values for repeatability and reproducibility do not necessarily represent those quantities which would be obtained if other material combinations were tested 6 where: Work Item s – proposed revisions of this standard.
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. Calibration of the friction force see section 7. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Any ball movement within the holder during the test invalidates the test results. To measure the wear, it is necessary to clean the specimens in such a way that the surface features are not altered. Commercial designations for materials should be given, if applicable. Two wear tests were performed on each?
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A statement such as the following may then be used: However, the replacement of the specimens in the machine to continue testing may not produce identical contact conditions to those when the test was interrupted. Linear wear friction test reproduces the linear reciprocating motion found in many real-world tribology mechanisms.
Originally approved in Construction of a controlledhumidity enclosure around the testing? Statically applied loads shall be kept constant within a maximum deviation of A small, shallow annulus surrounding the elastically deformed area may give the impression of wear, whereas little or no appreciable wear has actually occurred.
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. The direction of the relative motion between sliding surfaces reverses in y133 periodic fashion asrm that the sliding occurs back and forth and b133 a straight line.
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. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? Surface roughnesses of 0. Test parameters to be reported should conform with either Procedure A or B. This is essential to accurately study the trend of friction across the full length of the test. Current edition approved Nov.
Extending Your Robot’s Reach: Generally, in calculating wear volume of the? Test loads and speeds are to be determined by the severity of the proposed application or purpose of the testing. If other methods, such a controlled drip feeding system, are used to simulate certain applications, the provisions of 8.
A cycle is de? Other tests, such as those for door handles and lock mechanisms, include evaluation of different base materials, heat treatment conditions, surface coatings, and lubricants. Piston ring segment holder Comprehensive tribology testing plays an important role in automotive applications.
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. Testing on days with similar humidity readings is a less-desirable alternative.
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