Velocity Temperature Superposition – Friction Master Curve
Polymers tend to change their properties (and thus the curves of their properties, such as Young’s Modulus, Bending Modulus and impact toughness) at different temperatures. Friction is not exempt from this impact. With the method presented in this report, a huge velocity range can be generated by testing the same material at constant velocity levels, while only varying the temperature. This is very helpful if one would like to extend the capacities to extremely low or extremely high sliding velocities, which are not accessible directly through experimental testing.
In this report, a method for characterizing tribological polymer properties at different temperatures using an Anton Paar MCR Tribometer is explained. Using a simple test setup and only testing at a few different temperatures, a huge velocity range can be displayed. Often very low and very high sliding velocities cannot be tested due to the mechanical limits of the testing equipment. To get information beyond these limits, it is possible to test at different temperatures and superpose the curves to get an overlapping “master curve” covering a huge range of sliding velocities. The scientific background for this can be found in the rheology and tribology of elastomers, for which this procedure is already a common practice for obtaining information about a broad velocity range.
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