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A Study Of Crack Closure In Fatigue

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A Study Of Crack Closure In Fatigue

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Author : T. T. Shih
language : en
Publisher:
Release Date : 1973

A Study Of Crack Closure In Fatigue written by T. T. Shih and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Metals categories.

Crack closure phenomenon in fatigue was studied by using a Ti-6Al-4V titanium alloy. The occurrence of crack closure was directly measured by an electrical-potential method, and indirectly by load-strain measurement. The experimental results showed that the onset of crack closure depends on both the stress ratio, and the maximum stress intensity factor. No crack closure was observed for stress ratio, greater than 0.3 in this alloy. A two-dimensional elastic model was used to explain the behavior of the recorded load-strain curves. Closure force was estimated by using this model. Yield level stress was found near the crack tip. Based on this estimated closure force, the crack opening displacement was calculated. This result showed that onset of crack closure detected by electrical-potential measurement and crack-opening-displacement measurement is the same. The implications of crack closure on fatigue crack are considered. The experimental results show that crack closure cannot fully account for the effect of stress ratio, on crack growth, and that it cannot be regarded as the sole cause for delay.

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.

Advances In Fatigue Crack Closure Measurement And Analysis

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Author : R. Craig McClung
language : en
Publisher: ASTM International
Release Date : 1999

Advances In Fatigue Crack Closure Measurement And Analysis written by R. Craig McClung and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Fracture mechanics 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.

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.

Experimental Study Of Fatigue Crack Propagation And Retardation Using Polymethylmethacrylate

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Author : Francis J. Pitoniak
language : en
Publisher:
Release Date : 1972

Experimental Study Of Fatigue Crack Propagation And Retardation Using Polymethylmethacrylate written by Francis J. Pitoniak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1972 with Polymethylmethacrylate categories.

Fatigue cracks were grown in compact tension specimens of polymethylmethacrylate, a transparent polymer which was used as a model for metals. Various peak overloads applied to the constant DeltaK baselines used produced changes in the baseline load crack growth rates. A study of the monochromatic light interference fringe patterns emanating from the fatigue cracks at zero load indicated that the crack surface were closed along the saw cut edge and on the free surface of the specimens. The crack surfaces were displaced in the interior of the specimen at zero load. Measurement of the crack opening displacements from the fringe patterns indicated that the crack surfaces opened on the free surface at approximately half the baseline load level for a stress ratio of approximately zero. This is in agreement with the Elber crack closure concept.

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.