Practical Challenges Testing Coupons with Residual Stresses from Cold Expanded Holes PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Practical Challenges Testing Coupons with Residual Stresses from Cold Expanded Holes PDF full book. Access full book title Practical Challenges Testing Coupons with Residual Stresses from Cold Expanded Holes by Len Reid. Download full books in PDF and EPUB format.
Author: Len Reid Publisher: ISBN: Category : Crack growth Languages : en Pages : 17
Book Description
Cold expanding holes in metal components is widely used throughout the aerospace industry to extend fatigue life and damage tolerance. The beneficial residual stresses induced by hole cold expansion arrest or significantly retard the growth of fatigue cracks, and in doing so make fatigue or crack growth life prediction more difficult. Under low stress level/high cycle fatigue testing, residual compressive stresses have been shown to increase the fatigue strength of the material leading to an "infinite life" and consequent "run-out" of test coupons at the test hole or changing the location of failure away from the test hole. While advantageous to aircraft operators, it makes statistical life prediction difficult because the incomplete data have to be censored, leading to a knock-down of the beneficial life attained. Conversely, increasing stress levels toward material yield stress; life improvement factors are more definitive and tend toward unity. This paper reviews the derivation of residual stresses induced by hole cold expansion and discusses benefits to the structure/test coupon and how the residual stress field impacts fatigue life and damage tolerance/durability under cyclic load conditions. Challenges observed when testing coupons that have been processed using hole cold expansion including modification of the crack behavior and its effect on material microstructure, relocation of crack initiation, dynamics of the redistribution of stress and the crack growth mechanism as well as scatter of results, are also discussed with a focus on aluminum materials.
Author: Len Reid Publisher: ISBN: Category : Crack growth Languages : en Pages : 17
Book Description
Cold expanding holes in metal components is widely used throughout the aerospace industry to extend fatigue life and damage tolerance. The beneficial residual stresses induced by hole cold expansion arrest or significantly retard the growth of fatigue cracks, and in doing so make fatigue or crack growth life prediction more difficult. Under low stress level/high cycle fatigue testing, residual compressive stresses have been shown to increase the fatigue strength of the material leading to an "infinite life" and consequent "run-out" of test coupons at the test hole or changing the location of failure away from the test hole. While advantageous to aircraft operators, it makes statistical life prediction difficult because the incomplete data have to be censored, leading to a knock-down of the beneficial life attained. Conversely, increasing stress levels toward material yield stress; life improvement factors are more definitive and tend toward unity. This paper reviews the derivation of residual stresses induced by hole cold expansion and discusses benefits to the structure/test coupon and how the residual stress field impacts fatigue life and damage tolerance/durability under cyclic load conditions. Challenges observed when testing coupons that have been processed using hole cold expansion including modification of the crack behavior and its effect on material microstructure, relocation of crack initiation, dynamics of the redistribution of stress and the crack growth mechanism as well as scatter of results, are also discussed with a focus on aluminum materials.
Author: Jay Carroll Publisher: Springer ISBN: 3319628313 Category : Science Languages : en Pages : 123
Book Description
Fracture, Fatigue, Failure and Damage Evolution, Volume 7 of the Proceedings of the 2017 SEM Annual Conference & Exposition on Experimental and Applied Mechanics, the seventh volume of nine from the Conference, brings together contributions to this important area of research and engineering. Session organizers include: Jay Carroll, Shuman Xia, Allison Beese, Ryan Berke, Garrett Pataky, Samantha Daly, Kavan Hazeli, Antonios Kontsos, Omer Ozgur Capraz, Scott Grutzik, Onome Scott-Emaukpor The collection presents early findings and case studies on a wide range of areas, including: Mechanics of Energy & Energetic Materials Vibration Effects in Fracture & Fatigue Fracture & Fatigue of Additively Manufactured Materials In Situ Techniques for Fatigue & Fracture Microscale & Microstructural Effects on Mechanical Behavior Fracture & Fatigue of Composites Integration & Validation of Models with Experiments Fracture & Fatigue in Extreme Environments Novel Experimental Methods for Fatigue and Fracture Fracture of Brittle & Ductile Materials Interfacial Fracture
Author: American Petroleum Institute Publisher: ISBN: Category : Oil well drilling Languages : en Pages : 226
Book Description
Papers on drilling and production practice, selected by the Program Committee of the American Petroleum Institute's Central Committee on Drilling and Production Practices, from the papers delivered at national or district meetings of the Division of Production.
Author: Gary S. Schajer Publisher: John Wiley & Sons ISBN: 1118342372 Category : Technology & Engineering Languages : en Pages : 328
Book Description
An introductory and intermediate level handbook written in pragmatic style to explain residual stresses and to provide straightforward guidance about practical measurement methods. Residual stresses play major roles in engineering structures, with highly beneficial effects when designed well, and catastrophic effects when ignored. With ever-increasing concern for product performance and reliability, there is an urgent need for a renewed assessment of traditional and modern measurement techniques. Success critically depends on being able to make the most practical and effective choice of measurement method for a given application. Practical Residual Stress Measurement Methods provides the reader with the information needed to understand key residual stress concepts and to make informed technical decisions about optimal choice of measurement technique. Each chapter, written by invited specialists, follows a focused and pragmatic format, with subsections describing the measurement principle, residual stress evaluation, practical measurement procedures, example applications, references and further reading. The chapter authors represent both international academia and industry. Each of them brings to their writing substantial hands-on experience and expertise in their chosen field. Fully illustrated throughout, the book provides a much-needed practical approach to residual stress measurements. The material presented is essential reading for industrial practitioners, academic researchers and interested students. Key features: • Presents an overview of the principal residual stress measurement methods, both destructive and non-destructive, with coverage of new techniques and modern enhancements of established techniques • Includes stand-alone chapters, each with its own figures, tables and list of references, and written by an invited team of international specialists
Author: Gary S. Publisher: Springer Nature ISBN: 3031797132 Category : Technology & Engineering Languages : en Pages : 172
Book Description
This book describes the theory and practice of the Hole-Drilling Method for measuring residual stresses in engineering components. Such measurements are important because residual stresses have a "hidden" character because they exist locked-in within a material, independent of any external load. These stresses are typically created during component manufacture, for example, during welding, casting, or forming. Because of their hidden nature, residual stresses are difficult to measure and consequently are often ignored. However, they directly add to loading stresses and can cause catastrophic failure if not properly included during engineering design. Thus, there is an urgent need to be able to identify and measure residual stresses conveniently and reliably. The Hole-Drilling Method provides an adaptable and well-proven method for measuring residual stresses in a wide range of materials and component types. It is convenient to use and gives reliable results. Because of the hidden nature of residual stresses, the measurement method must necessarily be indirect, thus, additional care and conceptual understanding are necessary to achieve successful results. This book provides a practical introduction to the Hole-Drilling Method, starting from its historical roots and going on to focus on its modern practice. The various chapters describe the nature of residual stresses, the principle of hole-drilling measurements, procedures and guidance on how to make successful measurements, and effective mathematical procedures for stress computation and analysis. The book is intended for practitioners who need to make residual stress measurements either occasionally or routinely, for practicing engineers, for researchers, and for graduate engineering and science students.
Author: Thomas M. Holden Publisher: Materials Research Forum LLC ISBN: 1945291176 Category : Technology & Engineering Languages : en Pages : 638
Book Description
This book presents the proceedings of the International Conference on Residual Stresses 10 and is devoted to the prediction/modelling, evaluation, control, and application of residual stresses in engineering materials. New developments, on stress-measurement techniques, on modelling and prediction of residual stresses and on progress made in the fundamental understanding of the relation between the state of residual stress and the material properties, are highlighted. The proceedings offer an overview of the current understanding of the role of residual stresses in materials used in wide ranging application areas.
Author: Len Reid
Author: Len Reid
Author: Jay Carroll
Author: 
Author: International Committee on Aeronautical Fatigue. Conference
Author: American Petroleum Institute
Author: 
Author: Gary S. Schajer
Author: Gary S.
Author: Thomas M. Holden
Author: