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

ISBN-13: 9789401087483 / Angielski / Miękka / 2011 / 308 str.

A. S. Krausz

Opis

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.

Spis treści

Numerical Modelling of Creep Crack Growth.- The Cyclic Deformation of 70-30?-Brass: Internal and Effective Stresses and Dislocation Substructures.- Fatigue Crack Growth — A Metallurgist’s Point of View.- The Effect of Solute Distribution on Creep Fracture in a Ni Alloy.- Some Factors Affecting the Corrosion Fatigue Performance of Welded Joints in Offshore Structures.- The Fractography of Environmentally Assisted Cracking.- Residual Strength of a Pressurized Heat Transport Pipe Containing a Defect.- Microstructural Effects on Creep and Fatigue.- Ethanol Craze Growth in Polycarbonate.- Effects of Microstructure, Cold Work and Anisotropy on Creep Crack Growth in Carbon Manganese Steel at 360°C.- Stress Corrosion Life Expectancy Topographs for the Determination of Design and Inspection Data.- Effects of Hydrogen and Heat Treatment Conditions on Fracture Toughness (J-lntegral) of Quenched and Tempered SAE-4130 Steel.- Influence of Interfacial Adhesion on Fatigue of Comaco Composites.- Thermal-Mechanical Fatigue Crack Growth in Inconel X-750.- Microstructura1 Features of High-Temperature Low-Cycle Fatigue Failure of MAR-M-200(+Hf) Alloy Under Basic Strainrange Partitioning Modes of Straining.- On Certain Fracture Mechanics Considerations in Environmental Cracking.- A Review of Fatigue Crack Initiation.- Creep Crack Growth in Ductile Materials.- Time Dependent Parameters in Dynamic Fracture.- A Proposed Rationale for Accounting for Boundary Layer Effects in Designing Against Fracture in Three Dimensional Problems.- The Influence of Microstructure upon the Creep and Fatigue Crack Growth Behaviour in Inconel 718.- On the Embrittlement of Niobium by Oxygen.- Cyclic Crack Growth Under Repeated Rolling Contact.- The Development of Curved Fracture Toughness Specimens Predicting Crack Growth in Candu Reactor Pressure Tubes.- List of Participants.