The Effect of Periodic Loading on the Shear Strength Properties of Thin Organic Polymeric Films

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Abstract
The paper commences with a description of a technique used to obtain the shear strength properties of thin (ca 100nm) solid polymeric films. The effect of velocity in this sliding experiment is rationalized in terms of the contact time in which a load is applied to an element of material and the shear strain rate in the film. The velocity range that may be employed is small in order to minimize the effects of frictional heating which somewhat restricts the investigation of the relative influences of these two parameters. A new experimental technique is described that may be used in conjunction with the conventional sliding system so as to elucidate uniquely the contact time effect. The method involves modulating the normal load with a small sinusoidal component, and while the experiment has not been analyzed rigorously, the accumulated data suggest that the response of the polymer film is dependent on the period in which it is loaded and that retardation in compression occurs with all polymer films to varying extents.

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