The interpretation of cyclic creep deformation mechanism of copper in terms of the anelastic recovery

Abstract

The cyclic creep deformation behaviour of copper has been studied in the temperature range of 0.4 to 0.5T m and under the constant stress range of (σ/E)=4×10−4 to 10×10−4. To see the effect of cyclic stress frequency, stress amplitude and the duration of the unloading time in a fixed frequency on cyclic creep behaviour, static and cyclic creep tests were conducted under the conditions mentioned above. The measured activation energies for static and cyclic creep were analysed in terms of the various experimental parameters. Anelastic behaviour during the unloading period was also studied to find out the possible assistance for the positive creep deformation in cyclic creep. Using the concept of anelastic recovery and the activation energy for the anelastic it is hypothesized that the accelerated cyclic creep deformation is controlled by the anelastic recovery during the unloading period.