Wear of Tank Track Pad Rubber Vulcanizates by Various Rocks

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Abstract
Wear of tank track pad compounds against various rocks at different normal loads and frictional work has been investigated. The track pads have been based on natural rubber (NR) and hydrogenated nitrile rubber (HNBR). The rocks have various hardness and chemical compositions. Wear, V, increases with normal load, N, and frictional work, F, and is related by V=KFn, where k and n are constants. The value of n is lower for filled compounds and abrasion against soft rock. At any normal load, the rate of wear of HNBR is much lower than that of NR, though the temperature developed is higher for HNBR compounds. All the results could be explained with the help of dynamic coefficient of friction, frictional work, and structural changes during abrasion. Ridges are found on the abraded surface of NR, and the surface is tarry. A dry and particulate wear is observed in HNBR compounds, and the size of debris increases with frictional work.

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