A Fatigue Crack Growth Theory Based On Energy Considerations
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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.
A Fatigue Crack Growth Theory
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Author : Leslie P. Pook
language : en
Publisher:
Release Date : 1973
A Fatigue Crack Growth Theory written by Leslie P. Pook and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with categories.
Expert System For Fatigue Crack Growth Predictions Based On Fatigue Crack Closure
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Author : Ji-Ho Song
language : en
Publisher: Springer Nature
Release Date : 2022-03-04
Expert System For Fatigue Crack Growth Predictions Based On Fatigue Crack Closure written by Ji-Ho Song and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-03-04 with Technology & Engineering categories.
This book demonstrates fatigue crack growth under random loading graphically. This state-of-the-art monograph introduces an expert system for crack growth predictions, particularly based on crack closure. The system is developed after years of research by the authors by using the Math-type software consisting of 5 parts. This system is unique as it is fundamentally different from previous systems as it focuses on fatigue crack growth predictions based on fatigue crack closure. This book can be a useful guide for practicing engineers, researchers, and students in the fields of mechanical, aerospace, or civil engineering.
Mechanics Of Crack Growth
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Author : J. R. Rice
language : en
Publisher: ASTM International
Release Date : 1976
Mechanics Of Crack Growth written by J. R. Rice 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 Technology & Engineering categories.
Stochastic Modeling Of Thermal Fatigue Crack Growth
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Author : Vasile Radu
language : en
Publisher: Springer
Release Date : 2014-11-19
Stochastic Modeling Of Thermal Fatigue Crack Growth written by Vasile Radu and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-19 with Science categories.
The book describes a systematic stochastic modeling approach for assessing thermal-fatigue crack-growth in mixing tees, based on the power spectral density of temperature fluctuation at the inner pipe surface. It shows the development of a frequency-temperature response function in the framework of single-input, single-output (SISO) methodology from random noise/signal theory under sinusoidal input. The frequency response of stress intensity factor (SIF) is obtained by a polynomial fitting procedure of thermal stress profiles at various instants of time. The method, which takes into account the variability of material properties, and has been implemented in a real-world application, estimates the probabilities of failure by considering a limit state function and Monte Carlo analysis, which are based on the proposed stochastic model. Written in a comprehensive and accessible style, this book presents a new and effective method for assessing thermal fatigue crack, and it is intended as a concise and practice-oriented guide for all undergraduate students, young scientists and researchers dealing with probabilistic assessment of structural integrity.
The Mechanics Of Fracture And Fatigue
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Author : A. P. Parker
language : en
Publisher: Spon Press
Release Date : 1981
The Mechanics Of Fracture And Fatigue written by A. P. Parker and has been published by Spon Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Technology & Engineering categories.
Predicition Of Fatigue Crack Propagation Using Strain Energy Density Method
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Author : 黃小華
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27
Predicition Of Fatigue Crack Propagation Using Strain Energy Density Method written by 黃小華 and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.
This dissertation, "Predicition of Fatigue Crack Propagation Using Strain Energy Density Method" by 黃小華, Siu-wah, Wong, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3120950 Subjects: Fracture mechanics - Mathematical models
Fracture And Fatigue In Wood
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Author : Ian Smith
language : en
Publisher: John Wiley & Sons
Release Date : 2003-06-02
Fracture And Fatigue In Wood written by Ian Smith and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-06-02 with Technology & Engineering categories.
Damage in wood is principally the result of fatigue. Fatigue is the process of progressive localised irreversible change in a material, and may culminate in cracks or complete fracture if conditions that initiated or propagated the process persist. Comprehensive understanding of fatigue and fracture in engineered wood components must be founded on a proper understanding of the damage processes. Although wood is the world's most widely used structural material, whether measured by volume consumed or value of finished construction, its behaviour is not well understood even by people who have spent their careers studying it. * What is known about failure processes comes almost entirely from empirical evidence collected for engineering purposes. * Hypotheses about behaviour of wood are based on macroscopic observation of specimens during and following tests. * With only limited resources and the need to obtain practical results quickly, the timber engineering research community has steered away from the scientific approach. * Forestry practices are changing and are known to influence characteristics of wood cells therefore there is a need to periodically reassess the mechanical properties of visually graded lumber the blackbox approach. Fatigue and Fracture of Wood examines the above issues from a scientific point of view by drawing on the authors' own research as well as previously published material. Unlike the empirical research, the book begins by examining growth of wood. It briefly examines its structure in relation to how trees grow, before assessing the fatigue and fracture of wood and discussing the scientific methods of modelling fatigue. * Covers from macro to micro behaviour of wood * Presents direct evidence of how wood fractures using Scanning Electron Microscopy * The first book to present a physically correct model for fracture in wood * Provides experimental proof of so-called memory in wood (i.e. dependence of fatigue behaviour on the loading sequence) * Givse practical illustrations of how theories and models can be applied in practice An essential resource for wood scientists/engineers, timber-engineering practitioners, and graduate students studying wood and solid mechanics.
Fatigue Crack Propagation With Strain Energy Density Approach
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Author : 馮錦生
language : en
Publisher:
Release Date : 2017-01-27
Fatigue Crack Propagation With Strain Energy Density Approach written by 馮錦生 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.
Mechanism Based Models Of Fatigue Crack Growth
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Author : Sassan Steven Shademan
language : en
Publisher:
Release Date : 2000
Mechanism Based Models Of Fatigue Crack Growth written by Sassan Steven Shademan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.