ASYMPTOTIC BEHAVIOR OF THE FAR STRESS FIELD IN THE PROBLEM OF CRACK GROWTH IN A DAMAGED MEDIUM UNDER CREEP CONDITIONS

摘要

An asymptotic analysis of stress fields, creep-strain rates, and continuity in the vicinity of the tip of a crack that grows under creep conditions is performed with allowance for accumulation of dissipated damages. The configuration of a region of a fully damaged material adjacent to the crack edges and its tip is determined and studied. It is shown that the Hutchinson-Rice-Rosengren solution cannot be used as the boundary condition at an infinite point, and a new asymptotic representation of the far stress field, governing the geometry of the region of the fully damaged material, is obtained.