Characterization of Stress Fields Near Pores and Application to Fatigue Lives 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 Characterization of Stress Fields Near Pores and Application to Fatigue Lives PDF full book. Access full book title Characterization of Stress Fields Near Pores and Application to Fatigue Lives by James C. Sobotka. Download full books in PDF and EPUB format.
Author: James C. Sobotka
Publisher:
ISBN:
Category : Additive manufacturing
Languages : en
Pages : 14
Get Book Here
Book Description
Additive manufacturing (AM) is a novel fabrication process with the potential to create unique parts beyond the capabilities of conventional manufacturing methods. However, because the AM process produces both the part and the material simultaneously, certification of safety-critical structural metallic parts requires new approaches that more explicitly quantify the influence of the AM process on the quality of the part. For example, the AM process can, when not properly designed and controlled, create defects, such as porosity, lack of fusion, or severe surface roughness. If these defects occur in a region of significant cyclic stress, they can promote the nucleation of cracks that, in turn, can grow to cause fracture of the part. This paper summarizes recent investigations into analytical characterization of defects and their effect on the structural integrity of additive manufactured parts. Specifically, this work documents predictive mechanics models that characterize the effects of pores on fatigue crack formation. These results provide insight into the effects of pore size and shape on fatigue lives under uniaxial tension.
Author: James C. Sobotka
Publisher:
ISBN:
Category : Additive manufacturing
Languages : en
Pages : 14
Get Book Here
Book Description
Additive manufacturing (AM) is a novel fabrication process with the potential to create unique parts beyond the capabilities of conventional manufacturing methods. However, because the AM process produces both the part and the material simultaneously, certification of safety-critical structural metallic parts requires new approaches that more explicitly quantify the influence of the AM process on the quality of the part. For example, the AM process can, when not properly designed and controlled, create defects, such as porosity, lack of fusion, or severe surface roughness. If these defects occur in a region of significant cyclic stress, they can promote the nucleation of cracks that, in turn, can grow to cause fracture of the part. This paper summarizes recent investigations into analytical characterization of defects and their effect on the structural integrity of additive manufactured parts. Specifically, this work documents predictive mechanics models that characterize the effects of pores on fatigue crack formation. These results provide insight into the effects of pore size and shape on fatigue lives under uniaxial tension.
Author: J. Schijve
Publisher: Springer Science & Business Media
ISBN: 1402068085
Category : Science
Languages : en
Pages : 627
Get Book Here
Book Description
Fatigue of structures and materials covers a wide scope of different topics. The purpose of the present book is to explain these topics, to indicate how they can be analyzed, and how this can contribute to the designing of fatigue resistant structures and to prevent structural fatigue problems in service. Chapter 1 gives a general survey of the topic with brief comments on the signi?cance of the aspects involved. This serves as a kind of a program for the following chapters. The central issues in this book are predictions of fatigue properties and designing against fatigue. These objectives cannot be realized without a physical and mechanical understanding of all relevant conditions. In Chapter 2 the book starts with basic concepts of what happens in the material of a structure under cyclic loads. It illustrates the large number of variables which can affect fatigue properties and it provides the essential background knowledge for subsequent chapters. Different subjects are presented in the following main parts: • Basic chapters on fatigue properties and predictions (Chapters 2–8) • Load spectra and fatigue under variable-amplitude loading (Chapters 9–11) • Fatigue tests and scatter (Chapters 12 and 13) • Special fatigue conditions (Chapters 14–17) • Fatigue of joints and structures (Chapters 18–20) • Fiber-metal laminates (Chapter 21) Each chapter presents a discussion of a speci?c subject.
Author: Yung-Li Lee
Publisher: Elsevier
ISBN: 0080477690
Category : Technology & Engineering
Languages : en
Pages : 417
Get Book Here
Book Description
Fatigue Testing and Analysis: Theory and Practice presents the latest, proven techniques for fatigue data acquisition, data analysis, and test planning and practice. More specifically, it covers the most comprehensive methods to capture the component load, to characterize the scatter of product fatigue resistance and loading, to perform the fatigue damage assessment of a product, and to develop an accelerated life test plan for reliability target demonstration. This book is most useful for test and design engineers in the ground vehicle industry. Fatigue Testing and Analysis introduces the methods to account for variability of loads and statistical fatigue properties that are useful for further probabilistic fatigue analysis. The text incorporates and demonstrates approaches that account for randomness of loading and materials, and covers the applications and demonstrations of both linear and double-linear damage rules. The reader will benefit from summaries of load transducer designs and data acquisition techniques, applications of both linear and non-linear damage rules and methods, and techniques to determine the statistical fatigue properties for the nominal stress-life and the local strain-life methods. Covers the useful techniques for component load measurement and data acquisition, fatigue properties determination, fatigue analysis, and accelerated life test criteria development, and, most importantly, test plans for reliability demonstrations Written from a practical point of view, based on the authors' industrial and academic experience in automotive engineering design Extensive practical examples are used to illustrate the main concepts in all chapters
Author: Yukitaka Murakami
Publisher: Elsevier
ISBN: 0080496563
Category : Technology & Engineering
Languages : en
Pages : 384
Get Book Here
Book Description
Metal fatigue is an essential consideration for engineers and researchers who are looking at factors that cause metals to fail through stress, corrosion, etc. This is an English translation of a book originally published in Japan in 1993, with an additional two chapters on the fatigue failure of steels and the effect of surface roughness on fatigue strength. The methodology is based on important and reliable results and may be usefully applied to other fatigue problems not directly treated in this book.
Author: Norman E. Dowling
Publisher: Prentice Hall
ISBN: 9780131863125
Category : Technology & Engineering
Languages : en
Pages : 912
Get Book Here
Book Description
Comprehensive in scope and readable, this book explores the methods used by engineers to analyze and predict the mechanical behavior of materials. Author Norman E. Dowling provides thorough coverage of materials testing and practical methods for forecasting the strength and life of mechanical parts and structural members.
Author: Theodore Nicholas
Publisher: Elsevier
ISBN: 0080458874
Category : Science
Languages : en
Pages : 657
Get Book Here
Book Description
Dr Theodore Nicholas ran the High Cycle Fatigue Program for the US Air Force between 1995 and 2003 at Wright-Patterson Air Force Base, and is one of the world’s leading authorities on the subject, having authored over 250 papers in leading archival journals and books. Bringing his plethora of expertise to this book, Dr Nicholas discusses the subject of high cycle fatigue (HCF) from an engineering viewpoint in response to a series of HCF failures in the USAF and the concurrent realization that HCF failures in general were taking place universally in both civilian and military engines. Topic covered include: Constant life diagrams Fatigue limits under combined LCF and HCF Notch fatigue under HCF conditions Foreign object damage (FOD) Brings years of the Author's US Air Force experience in high cycle fatigue together in one text Discusses HCF in the context of recent international military and civilian engine failures
Author: Lorna J. Gibson
Publisher: Cambridge University Press
ISBN: 9780521499118
Category : Science
Languages : en
Pages : 536
Get Book Here
Book Description
In this new edition of their classic work on Cellular Solids, the authors have brought the book completely up to date, including new work on processing of metallic and ceramic foams and on the mechanical, electrical and acoustic properties of cellular solids. Data for commercially available foams are presented on material property charts; two new case studies show how the charts are used for selection of foams in engineering design. Over 150 references appearing in the literature since the publication of the first edition are cited. The text summarises current understanding of the structure and mechanical behaviour of cellular materials, and the ways in which they can be exploited in engineering design. Cellular solids include engineering honeycombs and foams (which can now be made from polymers, metals, ceramics and composites) as well as natural materials, such as wood, cork and cancellous bone.
Author: United States. Naval Air Systems Command
Publisher:
ISBN:
Category :
Languages : en
Pages : 360
Get Book Here
Book Description
Author: Subra Suresh
Publisher: Cambridge University Press
ISBN: 9780521578479
Category : Technology & Engineering
Languages : en
Pages : 708
Get Book Here
Book Description
Written by a leading researcher in the field, this revised and updated second edition of a highly successful book provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, non-metals and composites. The author discusses the principles of cyclic deformation, crack initiation and crack growth by fatigue, covering both microscopic and continuum aspects. The book begins with discussions of cyclic deformation and fatigue crack initiation in monocrystalline and polycrystalline ductile alloys as well as in brittle and semi-/non-crystalline solids. Total life and damage-tolerant approaches are then introduced in metals, non-metals and composites followed by more advanced topics. The book includes an extensive bibliography and a problem set for each chapter, together with worked-out example problems and case studies. This will be an important reference for anyone studying fracture and fatigue in materials science and engineering, mechanical, civil, nuclear and aerospace engineering, and biomechanics.
Author: Lauralice de Campos Franceschini Canale
Publisher: ASM International
ISBN: 1615030980
Category : Technology & Engineering
Languages : en
Pages : 651
Get Book Here
Book Description
