Creep Rupture under Uniform Radial Tension of a Disk with a Circular Hole

摘要

A theoretical and experimental study has been carried out where a disk with a circular hole has been subjected to radial tension under creep conditions. The initiation and progression of cracking has been analyzed based on Kachanov's original postulates, using the approaches of Odqvist and Tresca, for the case of quasi-steady or stationary stress states during the progression of cracking. First and second order approximations to the large deformation approach using Tresca's flow criterion are included. The results of an experimental study on thin disks of a magnesium alloy are detailed. Although exhaustive quantitative comparisons could not be attempted due in part to experimental difficulties, the general trend of the data confirms the theoretical predictions. In particular, the radial direction of the observed cracks points to a maximum tensile stress criterion for crack initiation. A simple way of calculating the final rupture time is indicated corresponding to the rupture time produced by the applied stress. (Author)