Time-Dependent Fracture : Proceedings of the Eleventh Canadian Fracture Conference, Ottawa, Canada, June 1984

The understanding of time dependent crack propagation processes occupies a central place in the study of fracture. It also encompasses a wide range of conditions: failure under sustained loading in a corrosive environment, fracture under cyclic loading in non-degrading and in corrosive environment, and rupture at high temperature. This list covers probably 90% of the failures that occur in engineering practice. The process of time dependent fracture is controlled by the physics of atomic interaction changes; it is strongly influenced by the micro­ structure; and affected by the interaction of the material with the mechanical (load, displacement), the thermal (temperature), and the chemical or radiation environment. To be able to control crack propagation the development of testing methods and the understanding of the industrial environment is essential. The conference was organized in this context. A call was issued for contributions to the following topics. THERMAL ACTIVATION. Theoretical papers dealing with the modification of fracture mechanics to accommodate thermally activated processes. TIME DEPENDENT MICRO-PROCESSES. Presentations covering both the theoretical and observational aspects of creep and fatigue damage in materials whose microstructures may exert a significant influence on crack growth. INDUSTRIAL APPLICATIONS. Submissions describing the practical application of fracture mechanics and damage tolerance analysis to the determination of useful operating lives. x ENVIRONMENTAL EFFECTS. Papers dealing with engineering materials and/or components exposed to aggressive environments, with and without temperature effects. The response was gratifying. Leading experts responded; the organizers of the conference are grateful for the large number of excellent contributions. Front Matter....Pages I-X Numerical Modelling of Creep Crack Growth....Pages 1-12 The Cyclic Deformation of 70-30 α-Brass: Internal and Effective Stresses and Dislocation Substructures....Pages 13-26 Fatigue Crack Growth — A Metallurgist’s Point of View....Pages 27-42 The Effect of Solute Distribution on Creep Fracture in a Ni Alloy....Pages 43-52 Some Factors Affecting the Corrosion Fatigue Performance of Welded Joints in Offshore Structures....Pages 53-67 The Fractography of Environmentally Assisted Cracking....Pages 69-82 Residual Strength of a Pressurized Heat Transport Pipe Containing a Defect....Pages 83-92 Microstructural Effects on Creep and Fatigue....Pages 93-110 Ethanol Craze Growth in Polycarbonate....Pages 111-120 Effects of Microstructure, Cold Work and Anisotropy on Creep Crack Growth in Carbon Manganese Steel at 360°C....Pages 121-130 Stress Corrosion Life Expectancy Topographs for the Determination of Design and Inspection Data....Pages 131-145 Effects of Hydrogen and Heat Treatment Conditions on Fracture Toughness (J-Integral) of Quenched and Tempered SAE-4130 Steel....Pages 147-158 Influence of Interfacial Adhesion on Fatigue of Comaco Composites....Pages 159-166 Thermal-Mechanical Fatigue Crack Growth in Inconel X-750....Pages 167-178 Microstructural Features of High-Temperature Low-Cycle Fatigue Failure of Mar-M-200(+Hf) Alloy under Basic Strainrange Partitioning Modes of Straining....Pages 179-188 On Certain Fracture Mechanics Considerations in Environmental Cracking....Pages 189-200 A Review of Fatigue Crack Initiation....Pages 201-212 Creep Crack Growth in Ductile Materials....Pages 213-222 Time Dependent Parameters in Dynamic Fracture....Pages 223-232 A Proposed Rationale for Accounting for Boundary Layer Effects in Designing Against Fracture in Three Dimensional Problems....Pages 233-243 The Influence of Microstructure upon the Creep and Fatigue Crack Growth Behaviour in Inconel 718....Pages 245-260 On the Embrittlement of Niobium by Oxygen....Pages 261-270 Cyclic Crack Growth under Repeated Rolling Contact....Pages 271-280 The Development of Curved Fracture Toughness Specimens for Predicting Crack Growth in Candu Reactor Pressure Tubes....Pages 281-291 Back Matter....Pages 293-298