Measurement of Contact Pressure by Electrodeposited Copper Foil : 3rd Report, Evaluation of Cyclic Pressure by the Foil with Micro Projections

Abstract

The method for measuring cyclic pressure distribution between two bodies in contact is investigated by applying the electrodeposited copper foil with pyramidal micro projections. Namely, sandwiching the foil between contact surfaces of the elements, the effects of static pressure p_m and cyclic pressure p_d on the deformation of micro projections are examined by a laser microscope. Aiming at the work hardening by p_m and cyclic softening by p_d occurred at the micro projection, the relationship among p_m, p_d and the real contact area A_r of micro projections to the elements are formulated. On the basis of this formula, the cyclic pressure distribution occurred between the circular cylinder made of carbon steel and the element with flat surface made of brass or steel compressed each other are obtained, respectively by measuring A_r by p_m and that by p_m plus p_d and the accuracy of this method is examined.