Relation Between Cyclic Creep and Conventional Creep on Pure Copper

Abstract

The behaviour of a pure copper subject to conventional creep and cyclic creep under imposed load is examined at room temperature, 200°C, 300°C, and 400°C to show the relation between these two kinds of phenomena. Plots of observed strain, not against the number of cycles, but against time are available for the direct comparison between cyclic creep and creep. The plastic strain, of which the instantaneous strain consisted together with the elastic strain, has considerable effect on the succeeding mechanisms of both creep and cyclic creep. At a high temperature of 400°C, strain accumulation due to creep is much more than that due to cyclic creep, while at room temperature cyclic creep has the superiority.