Assessment of J-integral near the tip of a circumferential edge crack in a thick-walled pipe on rapid cooling of its inner surface

Introduction. For the elastic model of metal behavior the value of stress intensity factor near the crack tip serves as the estimate of brittle fracture resistance of crack-containing structural elements [1]. Brittle fracture resistance under the elastoplastic deformation of the metal near the crack tip is evaluated by the stress intensity factor calculated from the J-integral value [2–5]. For instance, for the opening mode crack at the plane strain state, the