Fatigue Crack Growth Behavior in Alloy C415 in the Near Threshold Region PDF Download
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Author: Ashok Saxena
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages :
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Book Description
Author: Ashok Saxena
Publisher:
ISBN:
Category : Aluminum alloys
Languages : en
Pages :
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Book Description
Author: David L. Davidson
Publisher: Society for Mining Metallurgy & Exploration
ISBN: 9780895204752
Category : Technology & Engineering
Languages : en
Pages : 584
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Book Description
Author: Bhaskar Medapuram
Publisher:
ISBN:
Category :
Languages : en
Pages : 292
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Book Description
Author: J. C. Newman
Publisher: ASTM International
ISBN: 0803126247
Category : Fatigue
Languages : en
Pages : 436
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Book Description
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.
Author: Fei Chen
Publisher:
ISBN:
Category :
Languages : en
Pages : 370
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Book Description
The fatigue behaviour of aerospace structural components is dominated by the time to grow from a small sub mm size flaw to a flaw of the order of a few mm. As such crack growth is dominated by the Region I growth of short cracks. Consequently management of the fleet requires that Region I short crack growth be both understood and predicted. Recent studies at the NASA Johnson Space Center have shown that the current ASTM testing standards can produce Region I da/dN versus K data that are a function of the test geometry and, as result, that similitude was not valid in Region I. As a result the NASA Johnson Space Center has abandoned these standards. Similar conclusions follow from recent Australian studies into cracking in 7050-T7451 aluminium alloy under variable amplitude loading. This research particularly focuses on the near threshold crack growth behaviour in 7050-T7451 aluminium Alloy, which is widely used in F/A-18 Hornet, the Super Hornet and the Joint Strike Fighter (F35).In order to understand the short crack growth behaviour, a fatigue test program in 7050-T7451 Aluminium Alloy specimens under repeated block loading was performed. The results show that the short crack growth rate (da/dN) versus K anomaly is due to forcing a relationship between them. It is also shown that this anomaly vanishes if crack growth is expressed using the Generalized Frost-Dugdale crack growth equation or the Hartman-Shijve crack growth equation.In order to investigate the effect of the stress concentration factor (Kt) on the crack growth rate, the growth of fatigue cracks from etched pits and machinery defects at a fastener hole under an operation RAAF load spectrum was analysed. The results of this study show that the Hartman-Schijve equation can be used to predict DSTO short crack growth tests data for both low and high Kt specimens.Crack growth under a representative combat and transport load spectrum was also studied. The characteristic stress intensity factor range Krms and the Effective Block Approach for analysing fatigue crack growth was conducted. Here it was found that the Krms effective block approach is a valid method for predicting crack growth under F-15 Eagle fighter aircraft and military transport spectra.The use of the fractal based crack growth equation was also evaluated. In this content it was found that fracture surfaces associated with the growth of cracks from small near micron initial defects can be treated as a fractal set and that crack growth conforms to a fractal crack growth equation.From this research, the growth of fatigue cracks from small pits, typically less than 20m, to long cracks, can be represented by the Generalized Frost-Dugdale crack growth equation and the Hartman-Schijve crack growth equation.
Author: Jan Bäcklund
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 624
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Book Description
Author: K.S. Ravichandran
Publisher: Elsevier
ISBN: 0080569706
Category : Technology & Engineering
Languages : en
Pages : 511
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Book Description
This book contains the fully peer-reviewed papers presented at the Third Engineering Foundation Conference on Small Fatigue Cracks, held under the chairmanship of K.S. Ravichandran and Y. Murakami during December 6-11, 1998, at the Turtle Bay Hilton, Oahu, Hawaii. This book presents a state-of-the-art description of the mechanics, mechanisms and applications of small fatigue cracks by most of the world's leading experts in this field. Topics ranging from the mechanisms of crack initiation, small crack behavior in metallic, intermetallic, ceramic and composite materials, experimental measurement, mechanistic and theoretical models, to the role of small cracks in fretting fatigue and the application of small crack results to the aging aircraft and high-cycle fatigue problems, are covered.
Author: Gert Heinrich
Publisher: Springer Nature
ISBN: 3030689204
Category : Technology & Engineering
Languages : en
Pages : 491
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Book Description
The book summarizes recent international research and experimental developments regarding fatigue crack growth investigations of rubber materials. It shows the progress in fundamental as well as advanced research of fracture investigation of rubber material under fatigue loading conditions, especially from the experimental point of view. However, some chapters will describe the progress in numerical modeling and physical description of fracture mechanics and cavitation phenomena in rubbers. Initiation and propagation of cracks in rubber materials are dominant phenomena which determine the lifetime of these soft rubber materials and, as a consequence, the lifetime of the corresponding final rubber parts in various fields of application. Recently, these phenomena became of great scientific interest due to the development of new experimental methods, concepts and models. Furthermore, crack phenomena have an extraordinary impact on rubber wear and abrasion of automotive tires; and understanding of crack initiation and growth in rubbers will help to support the growthing number of activities and worldwide efforts of reduction of tire wear losses and abrasion based emissions.
Author: Roger Lumley
Publisher: Elsevier
ISBN: 0857090259
Category : Technology & Engineering
Languages : en
Pages : 862
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Book Description
Aluminium is an important metal in manufacturing, due to its versatile properties and the many applications of both the processed metal and its alloys in different industries. Fundamentals of aluminium metallurgy provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries.Part one discusses different methods of producing and casting aluminium, covering areas such as casting of alloys, quality issues and specific production methods such as high-pressure diecasting. The metallurgical properties of aluminium and its alloys are reviewed in Part two, with chapters on such topics as hardening, precipitation processes and solute partitioning and clustering, as well as properties such as fracture resistance. Finally, Part three includes chapters on joining, laser sintering and other methods of processing aluminium, and its applications in particular areas of industry such as aerospace.With its distinguished editor and team of expert contributors, Fundamentals of aluminium metallurgy is a standard reference for researchers in metallurgy, as well as all those involved in the manufacture and use of aluminium products. - Provides a comprehensive overview of the production, properties and processing of aluminium, and its applications in manufacturing industries - Considers many issues of central importance in aluminium production and utilization considering quality issues and design for fatigue growth resistance - Metallurgical properties of aluminium and its alloys are further explored with particular reference to work hardening and applications of industrial alloys
Author: JC. Newman
Publisher:
ISBN:
Category : Crack growth
Languages : en
Pages : 16
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Book Description
The accurate representation of fatigue crack threshold, the region defining crack growth as either very slow or nonexistent, is extremely important. If the experimentally measured threshold is unconservatively high, a structural component designed with this data may fail long before the fatigue analysis predicts. The fatigue crack growth threshold is experimentally defined using ASTM standard E 647, which has been shown to exhibit anomalies. Alternate test methods have been proposed, such as the constant Kmax test procedure, to define the threshold regime without ambiguity. However, only the current test method defined by ASTM is designed to produce the range of fatigue crack thresholds (e.g., low and high R) needed to characterize an acrospace loading environment. It is the scope of this paper to determine the fatigue crack growth threshold of a well characterized aerospace alloy, 7075-T7351 aluminum, using different methods, to compare the results, and to draw conclusions.
