Growth Of Surface Cracks Under Fatigue And Monotonic Increasing Load
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Growth Of Surface Cracks Under Fatigue And Monotonic Increasing Load
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Author : L. Hodulak
language : en
Publisher:
Release Date : 1990
Growth Of Surface Cracks Under Fatigue And Monotonic Increasing Load written by L. Hodulak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Constraint categories.
An engineering assessment of the life time and failure conditions for components with surface cracks can be easily done using a personal computer program. The methods, assumptions and the modeling of surface crack growth used in the program are briefly described.
Surface Crack Growth
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Author : Walter G. Reuter
language : en
Publisher: ASTM International
Release Date : 1990
Surface Crack Growth written by Walter G. Reuter and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Fracture mechanics categories.
From the symposium (on title) held in Sparks, Nevada, April 1988. Twenty-two peer-reviewed papers are divided into sections on models and experiments (monotonic loading), and fatigue crack growth. Areas addressed include the differences in constraint for 2-D through-thickness cracks and 3-D surface
Fatigue Damage Crack Growth And Life Prediction
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Author : F. Ellyin
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Fatigue Damage Crack Growth And Life Prediction written by F. Ellyin and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
Fatigue failure is a multi-stage process. It begins with the initiation of cracks, and with continued cyclic loading the cracks propagate, finally leading to the rupture of a component or specimen. The demarcation between the above stages is not well-defined. Depending upon the scale of interest, the variation may span three orders of magnitude. For example, to a material scientist an initiated crack may be of the order of a micron, whereas for an engineer it can be of the order of a millimetre. It is not surprising therefore to see that investigation of the fatigue process has followed different paths depending upon the scale of phenomenon under investigation. Interest in the study of fatigue failure increased with the advent of industrial ization. Because of the urgent need to design against fatigue failure, early investiga tors focused on prototype testing and proposed failure criteria similar to design formulae. Thus, a methodology developed whereby the fatigue theories were proposed based on experimental observations, albeit at times with limited scope. This type of phenomenological approach progressed rapidly during the past four decades as closed-loop testing machines became available.
Fatigue Crack Growth Thresholds Endurance Limits And Design
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Author : J. C. Newman
language : en
Publisher: ASTM International
Release Date : 2000
Fatigue Crack Growth Thresholds Endurance Limits And Design written by J. C. Newman and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Fatigue categories.
Annotation Contains 24 papers from the November, 1998 symposium of the same name, sponsored by the ASTM Committee E8 on Fatigue and Fracture, and presented by Newman and Piascik (both of the NASA Langley Research Center). The papers focus on such areas as fatigue-crack growth threshold mechanisms, loading and specimen-type effects, analyses of fatigue-crack-growth-threshold behavior, and applications of threshold concepts and endurance limits to aerospace and structural materials. Annotation copyrighted by Book News, Inc., Portland, OR.
Mechanics Of Fatigue Crack Closure
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Author : Wolf Elber
language : en
Publisher: ASTM International
Release Date : 1988
Mechanics Of Fatigue Crack Closure written by Wolf Elber and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Fracture mechanics categories.
A Fatigue Crack Growth Theory Based On Energy Considerations
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Author : PP. Milella
language : en
Publisher:
Release Date : 1999
A Fatigue Crack Growth Theory Based On Energy Considerations written by PP. Milella and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Crack closure categories.
The paper presents a further development of a fatigue crack growth theory based on an energy approach first published by the author in 1981 [1] and later revised in 1996 [2]. In an ideally elastic material containing a crack the only mechanism through which energy can be absorbed during a virtual crack extension is that associated to the creation of new free surface. It is an "in-out" situation in that a crack of a given length 2a under a stress state ? either becomes unstable or stays like it is. At variance, in a real elastic-plastic material the energy absorption rate R derives mainly from the energy stored ahead of the crack tip as plastic strain energy. The resistance R is no longer represented by a constant term, but becomes a rather complex function of crack length, increasing as the crack grows. The consequence is that even though a certain combination of crack size 2a and stress ? does not produce instability, yet there is sufficient energy in the system to drive the crack to a point where the driving force b is equal to the resistance R and the crack stops. Unloading the system and reloading it, the crack grows by fatigue indicating that the previous condition b = R is no longer satisfied. If this happens, it is because the volume that yields ahead of the crack tip is not capable during the reloading to absorb energy with the same rate as before. This forces the crack to grow further to regain the loss of energy absorption rate through the yielding of new material and to establish again the equilibrium between b and R. The author has related this lack of material capability to develop the same energy absorption rate in any of the following cycles to a shake-down effect that takes place in the plastic enclave. In each cycle, the loss of energy absorption rate is a fraction of the elastic one. The author has related this lack of material capability to develop the same energy absorption rate in any of the following cycles to a shake down effect that takes place in the plastic enclave. In each cycle, the loss of energy absorption rate is a fraction of the elastic one. Based on this hypothesis and on the assumption that the maximum fatigue crack growth can be inferred from the extension of the stretch-zone developed at the crack tip at the moment when the material starts to tear in a monotonic loading test, i.e., at JIc, a fatigue crack growth equation is obtained that relates the growth rate ?a not only to the stress intensity factor excursion ?K, but also to the toughness KIc of the material, through an exponent n, ranging from 2 to 4, which depends on the shape of the material J-R curve. The theory and the equation also explain why short cracks shall grow faster than large ones and actually define what shall be considered as a real short crack. It is also explained why the fatigue crack growth rate depends on the ratio between the minimum and maximum applied stress and is practically the same in any material independently of its yield stress and toughness.
Fatigue Crack Growth Under Spectrum Loads
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Author :
language : en
Publisher: ASTM International
Release Date : 1976
Fatigue Crack Growth Under Spectrum Loads written by and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Alloys categories.
The Theory Of Critical Distances
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Author : David Taylor
language : en
Publisher: Elsevier
Release Date : 2010-07-07
The Theory Of Critical Distances written by David Taylor and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-07-07 with Technology & Engineering categories.
Critical distance methods are extremely useful for predicting fracture and fatigue in engineering components. They also represent an important development in the theory of fracture mechanics. Despite being in use for over fifty years in some fields, there has never been a book about these methods – until now. So why now? Because the increasing use of computer-aided stress analysis (by FEA and other techniques) has made these methods extremely easy to use in practical situations. This is turn has prompted researchers to re-examine the underlying theory with renewed interest. The Theory of Critical Distances begins with a general introduction to the phenomena of mechanical failure in materials: a basic understanding of solid mechanics and materials engineering is assumed, though appropriate introductory references are provided where necessary. After a simple explanation of how to use critical distance methods, and a more detailed exposition of the methods including their history and classification, the book continues by showing examples of how critical distance approaches can be applied to predict fracture and fatigue in different classes of materials. Subsequent chapters include some more complex theoretical areas, such as multiaxial loading and contact problems, and a range of practical examples using case studies of real engineering components taken from the author’s own consultancy work. The Theory of Critical Distances will be of interest to a range of readers, from academic researchers concerned with the theoretical basis of the subject, to industrial engineers who wish to incorporate the method into modern computer-aided design and analysis. Comprehensive collection of published data, plus new data from the author's own laboratories A simple 'how-to-do-it' exposition of the method, plus examples and case studies Detailed theoretical treatment Covers all classes of materials: metals, polymers, ceramics and composites Includes fracture, fatigue, fretting, size effects and multiaxial loading
Growth Of Surface Cracks Under Fatigue Loading
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Author : Ichsan S. Putra
language : en
Publisher:
Release Date : 1991
Growth Of Surface Cracks Under Fatigue Loading written by Ichsan S. Putra and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
Fatigue Crack Growth
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Author : Hans Albert Richard
language : en
Publisher: Springer
Release Date : 2016-06-13
Fatigue Crack Growth written by Hans Albert Richard and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-06-13 with Technology & Engineering categories.
This book offers a concise introduction to fatigue crack growth, based on practical examples. It discusses the essential concepts of fracture mechanics, fatigue crack growth under constant and variable amplitude loading and the determination of the fracture-mechanical material parameters. The book also introduces the analytical and numerical simulation of fatigue crack growth as well as crack initiation. It concludes with a detailed description of several practical case studies and some exercises. The target group includes graduate students, researchers at universities and practicing engineers.