Abstract
Single- and multi-asperity models, made of various grades of modelling clay, were separately deformed by being pressed against a hard flat surface. The behaviour of each single conical asperity model followed a qualitatively similar pattern to that exhibited by a conical asperity on a metal surface. At low loads a clay single asperity model deformed in a similar manner to that for an identical asperity when it formed part of an abutting regular array of such asperities. However at higher loads there was a tendency for the multi-asperity model to exhibit greater flow pressures than for the single asperity model: this was due to asperity interaction.
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