By MJ Neale and M Gee (Auth.)
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Additional resources for A Guide to Wear Problems and Testing for Industry
However, the true surface finish on the cylinder liner cannot be reproduced easily. Wear Tests to Simulate Practical Conditions 53 A problem with this arrangement [Fig. 4(a)] is that the running temperature tends to be controlled by the frictional heating and this may not match the practical values combined with typical contact loads and speeds. This can be overcome by the use of the arrangement shown in Fig. 4(c), which can attempt to simulate the conditions for a piston ring around top dead centre, where the wear usually occurs.
52 Wear Problems and Testing for Industry However, the test specimens are of a relatively complex geometry, which is a disadvantage if new materials are to be tested. Tests on existing materials can conveniently use test specimens cut from the actual components. However, if an actual piston ring is used with a matching liner it will be found that the free ring curvature does not match that of the liner, when the ring is not radially compressed as in the piston. A practical solution to this is to use test pieces cut from the ring next to its gap and discard the rest of the ring.
A pin-on-disc test as shown in the arrangement depicted by Fig. 4(a) has been used as a very simplified test for piston ring and cylinder materials with the pin representing the ring and the disc representing the cylinder. The pin has a continuous rubbing contact and the disc an intermittent contact, and the pin diameter and its rubbing radius should be matched to the practical configuration. The contact surface of the pin can also be spherically shaped to represent the running surface of a piston ring, which is typically similar to a barrel with a large radius of curvature.