Author(s)

M. Nakamura

Abstract

Constriction resistance of conducting spots in an electric contact surface M. Nakamura Department of Electronic Engineering, Tamagawa University, Machida, Tokyo 19 4 ^ Japan ABSTRACT In electric or electronic circuits, there are always contact surfaces such as relay and switch. When an electric current flows through the contact boundary surface between two conducting bodies, the real contact area where the current can pass is far smaller than the nominal or apparent contact area, and the current constricts to real contact conducting spots. The resistance of conducting spots is called the constriction resistance. In this parer the boundary clement method is introduced into the computation of the constriction resistance, and the superiority of the method is particularly demonstrated in the computation. At first the constriction resistance of a circular spot is computed, the computed values arc compared with the exact solution, and the high

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