A Model on Fatigue Crack Growth Rates in the Threshold Region in Polycrystalline Metallic Materials and Analysis of Crack Closure PDF Download
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Author: Bhaskar Medapuram
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Author: Bhaskar Medapuram
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Author: J. C. Newman
Publisher:
ISBN:
Category : Materials
Languages : en
Pages : 45
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Book Description
This paper reviews the capabilities of a plasticity-induced crack-closure model and life-prediction code to predict fatigue crack growth and fatigue lives of metallic materials. Crack-tip constraint factors, to account for three-dimensional effects, were selected to correlate large-crack growth rate data as a function of the effective-stress-intensity factor range ([pie]Keff) under constant-amplitude loading. Some modifications to the [pie]Keff-rate relations were needed in the near-threshold regime to fit small-crack growth rate behavior and endurance limits. The model was then used to calculate small- and large-crack growth rates, and in some cases total fatigue lives, for several aluminum and titanium alloys under constant-amplitude, variable-amplitude, and spectrum loading. Fatigue lives were calculated using the crack-growth relations and microstructural features like those that initiated cracks. Results from the tests and analyses agreed well.
Author: S. J Hudak
Publisher: ASTM International
ISBN:
Category : Aluminum alloys
Languages : en
Pages : 374
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Author: J. C. Newman (Jr)
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Author: Michael K. Schaper
Publisher:
ISBN:
Category : Crack closure
Languages : en
Pages : 23
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Book Description
This paper summarizes long-term research on fatigue crack closure in several labs of the author. Various experimental techniques were used in different combinations. Primarily, a sophisticated dynamic compliance technique based on highly sensitive resonance vibration measurements and crack tip diffracted ultrasonic wave analysis is applied. Whereas the first method reflects the global through thickness behavior, the second method enables spatial resolution, which is achieved with a reduction of sensitivity yet has the advantage that the signal generation is independent on the stress state ahead of the crack tip. The results allow a coherent view into the effects of the stress state, material plasticity, fracture surface roughness, and oxidation tendency on the closure behavior and, therefore, on both the threshold stress intensity and near-threshold crack propagation. Specifically, the different load ratio, load sequence, and the environmental effects on the threshold values of ferritic, martensitic, and austenitic steels are addressed.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 934
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Author: Ji-Ho Song
Publisher: Springer Nature
ISBN: 9811680361
Category : Technology & Engineering
Languages : en
Pages : 88
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Book Description
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.
Author:
Publisher:
ISBN:
Category : Mechanics, Applied
Languages : en
Pages : 692
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 830
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Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Author: Andrea Carpinteri
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 1052
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