Advances in Fatigue Science and Technology

This volume contains the edited version of lectures and selected research contributions presented at the NATO ADVANCED STUDY INSTITUTE on ADVANCES IN FATIGUE SCIENCE AND TECHNOLOGY. held in Alvor. Portugal, 4th to 15th of April 1988. and organized by CEMUL - Center of Mechanics and Materials of The Technical University of Lisbon. The Institute was attended by 101 participants, including 15 lecturers. from 14 countries. The participants were leading scientists and engineers from universities, research institutions and industry. and also Ph.D~ students. Some participants presented papers during the Institute reporting the state-of-art of their research projects. All the sessions wel'e very active and quite extensive discussions on scientific aspects took place during the Institute. The Advanced Study Institute provided a forum for interaction among eminent scientists and engineers. from different schools of thought and young researchers. The Institute addressed the foundations and current state of the art of essential aspects related to fatigue science and technology, namely: Short Cracks, Metallurgical Aspects, Environmental Fatigue, Threshold Behaviour, Notch Behaviour. Creep and Fatigue Interactions at High Temperature, Multiaxial Fatigue, Low Cycle Fatigue, Methodology of Fatigue Testing, Variable Amplitude Fatigue, Fatigue of Advanced Materials. Elastic-Plastic Fatigue, and several engineering applications such as welded joints, energy systems, offshore structures, automotive industry, machine and engine components. This book is organized in three parts: Part I: Fundamentals of Fatigue Part II: Engineering Applications Part III: Research Contributions The research contributions covered most of the areas referred above.

Inhalt

I - Fundamentals of Fatigue.- Short Fatigue Cracks.- The Influence of The Microstructure on Fatigue.- Modelling of Fatigue Crack Growth.- Statistical Analysis of Fatigue Crack Growth.- Fatigue Threshold Behaviour Part I: Modelling of FCG Near Threshold.- II: Theoretical Aspects and Open Questions.- Fatigue at Notches.- A Review of Fatigue Life Prediction Models for the Crack Initiation and Propagation Phases.- Environmentally Assisted Fatigue Crack Growth.- Non-Propagating Fatigue Cracks: The True Fatigue Limit.- Experimental Techniques to Observe and Monitor Short Fatigue Cracks.- Mechanisms of Creep-Fatigue Interactions.- Elevated Temperature Life Prediction Methode.- Multiaxial Fatigue Failure.- Multiaxial Fatigue Crack Propagation Behaviour.- Analysis and Design Methods in Multiaxial Fatigue.- A Review of Fatigue Predictive Methods in the Regime where Inelastic Strains Dominate.- Fatigue Crack Initiation at Notches: Techniques, Experiments and Interpretations.- Creep and Low Cycle Fatigue Analysis of Engineering Alloys - A Review.- The J Integral Approach in Elastic-Plastic Fatigue Crack Propagation.- II - Engineering Applications.- The SAE Round-Robin Fatigue Program with A356-T6 (A17 SiMg) Cast Aluminum Alloy.- Methodology of Variable Amplitude Fatigue Tests.- How to Improve Fatigue Strength of Vehicle Components Employing Different Test Methods.- Fatigue Behaviour of Welded Joints.- Fatigue Design Optimisation in Welded Joints.- Fatigue Life Prediction Methods in Welded Joints: Case Studies.- Fatigue Analysis in Offshore Structures.- The Damaging of Composite Materials: Mechanisms and Detection.- The Fatigue of High Performance Composite Materials.- Damage Assessment in Fatigue of Reinforced Structural Composites.- Mechanical Aspects Related to Fibre Fracture in ARALL 2 Laminates.- Development in Fatigue Design in Automotive Industry Using New Materials.- Damage Evaluation and Life Extension of Structural Components.- Optimisation of Component Design by Fatigue Analysis and Testing.- III - Research Contributions.- Cyclic Hardening and Softening of [001] Al Single Crystals.- Fatigue Crack Growth of Short Cracks in an A1MGSI Alloy.- Generalization of the Kitagawa Diagram to V-Notched Members.- Separate Contributions of Corrosion-Froduct Induced and Roughness-Induced Crack Closure to the Fatigue Threshold of Al Alloys.- Dynamic Analysis of Plasticity - Induced Fatigue Crack Closure.- Fatigue Crack Growth in Textured Metals.- Inelastic Modelling for Engineering Design for High Temperature Conditions.- Total Strain Energy Density as a Fatigue Damage Parameter.- Fatigue Crack Extension, A General Mechanism.- Interaction Between Fatigue Crack Growth, Yielding and Nonlinearly Viscous Material Response.- Multiaxial Fatigue: Damage Mechanisms and Life Predictions.- Cyclic Deformation Behaviour of a Fe-28Cr-4Mo-2Ni-ø.43Nb Superferritic Stainless Steel.- Fatigue and Brittle Fracture in Tubular Joints - A Probabilistic Fracture Mechanics Analysis.- Fatigue Investigation on Preloaded Welded Connections.- Influence of Surface Treatment on Fatigue Resistance of Aircraft Alloys.- The In Service Multi-Axial-Stress Situation in an Uncooled Gas Turbine Blade.- Time Dependent Effects on High Temperature bow Cycle Fatigue and Fatigue Crack Propagation of Nickel Base Superalloys.