A new direct shear testing apparatus for the examination of the velocity- and time-dependent friction

Csatár, Attila and Safranyik, Ferenc and Bercesi, Gábor (2013) A new direct shear testing apparatus for the examination of the velocity- and time-dependent friction. Hungarian Agricultural Engineering, 25. pp. 54-58. ISSN 0864-7410

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Abstract

There are contacting surfaces in all mechanisms moving on each other. Between these surfaces friction occurs, because of this we have to take the friction in all cases into consideration during design. Nevertheless in certain cases the description of the friction process is very difficult; because it depends on multiple number of parameters. In case of polymers, granular materials or in geology the velocity- and time dependent friction have great importance. In this paper, development of a direct shear testing apparatus to examine the velocity- and time-dependent friction is proposed. This shear apparatus is attached to the INSTRON 5581 type universal material testing machine and suitable for shearing with different (very low) velocities and on different loads. With our new apparatus creep and relaxation tests can be made, so the velocity- and time- dependent friction can be better understood.

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