![]() ![]() A typical friction curve measurement recorded on a pin on disk apparatus is shown in the figure below:Īs can be seen form the figure, at the start of the test, the measured coefficient of friction (COF) is high and with further progress drops. During the test, the friction force, wear and temperature are continuously monitored. The pin can be of any shape, however, the most popular shapes are spherical (ball or lens) or cylindrical due to ease of alignment of such pins (flat pins are typically subject to certain misalignment which can lead to non-uniform loading and difficulties for theoretical analysis). The stationary pin is pressed against rotating disk under the given load. Schematically, the pin on disk test is depicted in the figure above. Schematic diagram of a pin on disk test Pin on disk tribometer Further information on the tribology testing standards can be found here. Typically, the tests are performed under the following testing standards: ASTM G99, ASTM G133 and ASTM F732. The test typically allows to test several motion modes, such as unidirectional, fretting modes and recently any other complex motion patterns. ![]() The popularity of the method is due to its relative simplicity and abundance of the tribological contacts that can be well described by the a simple pin on disk motion: from dry contacts of bolt screws to rail wheels to rail contact and to lubricated contact of biological implants. Friction and wear (typically wear rates and wear resistance) characterization of materials is typically performed using various types of tribometers, while pin on disk test being probably one of the most common. ![]()
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