Creep of hollow concentric tubes

Abstract

Abstract

For a thin outer tube of non-linearly creeping material with a sharp yield stress surrounding a thick inner tube of linearly creeping material with a sharp yield stress which is swelling at a constant rate, the conditions in which each tube is plastic and in which each tube creeps have been determined for the conditions of zero axial load and zero axial strain. Equations yielding the ratios of the axial and circumferential creep rates of the outer tube to the swelling rate of the inner have been determined in terms of the material parameters for each of the above conditions and have been solved on the assumption that these ratios are small.