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The phenomenon of friction reduces the efficiency of almost all machines in practice. For reduce the deficits we have to understand this phenomenon and we have to take it in all cases into consideration during design. Nevertheless in certain cases the describing of a friction process is very difficult; because this depends on a lot of parameters. In case of polymers, granular materials or in geology the rateand state dependent friction have great importance. In this paper velocityand time dependent friction of polyamide and steel is examined with the help of a direct shear apparatus, which was developed in our earlier work. Based on the results of experimental measurements the previously developed apparatus is suitable for examine time dependent properties of friction.

EXAMINING THE VELOCITY- AND TIME-DEPENDENT FRICTION IN CASE OF STEEL AND POLYAMIDE