Advances in Fracture Research, Volume 6, documents the proceedings of the 5th International Conference on Fracture (ICF5) held in Cannes, France, 29 March-3 April 1981. The conference was attended by 670 participants from 26 countries. The program consisted of plenary sessions with invited speakers, technical sessions with contributed papers, a poster session, and two round table discussions.This volume contains 14 papers that deal with topics such as advancements in fracture mechanics; the application of fracture mechanics in three damage tolerance requirements for aircraft structures, toughness requirements for bridges and heat up and cool down schedule, and evaluation of in service NDE indications for nuclear pressure vessels; and the analysis of crack-tip stress and strain fields for stationary and growing cracks in inelastic solids under monotonic loading. Also included are papers on the impact of environment on fracture; the problem of fracture of large concrete structures; and microcracking in hydrogenated austenitic steels.