Random-Loading Fatigue Crack Growth Behavior of Some Aluminum and Titanium Alloys PDF Download
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Author: S. H. Smith Publisher: ISBN: Category : Airframes Languages : en Pages : 27
Book Description
This paper presents the results of an experimental investigation of the fatigue crack growth characteristics of some airframe materials under sinusoidal, narrow-band, and broad-band random loadings. Prerecorded random-time histories, generated by filtering the output of a white-noise generator to produce desired power spectral shapes, were utilized as input loadings to an electrohydraulic fatigue crack growth testing system. Uniform tension-tension loadings were applied to centrally cracked panels, and the fatigue crack growth behavior was observed. Alloys studied include 7075-T6 bare aluminum alloy, 2024-T3 bare aluminum alloy, Ti-8Al-1Mo-1V duplex and mill anneal, and Ti-6Al-4V mill anneal. Fracture-mechanics concepts are applied in correlating and comparing the fatigue crack growth behavior of the alloys. A comparison of sinusoidal- and random-loading behavior, based on the average of the greatest rise or fall in stress intensity between mean-level crossings, shows a faster fatigue crack growth rate for sinusoidal loading at the higher stress-intensity levels and a slower rate at the lower stress-intensity levels.
Author: S. H. Smith Publisher: ISBN: Category : Airframes Languages : en Pages : 27
Book Description
This paper presents the results of an experimental investigation of the fatigue crack growth characteristics of some airframe materials under sinusoidal, narrow-band, and broad-band random loadings. Prerecorded random-time histories, generated by filtering the output of a white-noise generator to produce desired power spectral shapes, were utilized as input loadings to an electrohydraulic fatigue crack growth testing system. Uniform tension-tension loadings were applied to centrally cracked panels, and the fatigue crack growth behavior was observed. Alloys studied include 7075-T6 bare aluminum alloy, 2024-T3 bare aluminum alloy, Ti-8Al-1Mo-1V duplex and mill anneal, and Ti-6Al-4V mill anneal. Fracture-mechanics concepts are applied in correlating and comparing the fatigue crack growth behavior of the alloys. A comparison of sinusoidal- and random-loading behavior, based on the average of the greatest rise or fall in stress intensity between mean-level crossings, shows a faster fatigue crack growth rate for sinusoidal loading at the higher stress-intensity levels and a slower rate at the lower stress-intensity levels.
Author: James M. Larsen Publisher: ISBN: Category : Aluminum alloys Languages : en Pages : 286
Book Description
An investigation was performed to study the effects of slip character and crack closure on the propagation of small fatigue cracks in titanium- aluminum alloys. The materials examined were solution-treated Ti-4Al and Ti-8Al, as well as aged Ti-8Al. The propagation of naturally initiated surface cracks of depths as small as 25 micrometers was compared with the behavior of large through-thickness cracks. An extensometer was used to monitor crack closure throughout the large crack tests, and the closure behavior of the small cracks was measured using a computerized laser interferometric displacement gage having a displacement resolution of 0.01 micrometer. The measurements of crack closure were used to compute an effective stress intensity factor range. In all three alloys and for all test conditions, which included a range of stress levels and stress ratios, small cracks propagated faster than large cracks subjected to an equivalent Delta K, and the small cracks propagated under conditions that were significantly below the large-crack threshold, Delta K(th). Although the character and distribution of slip in Ti-Al alloys may have a dramatic influence on fatigue crack initiation and on the propagation of large cracks, this effect was minimal for small cracks.
Author: Christian Lalanne Publisher: John Wiley & Sons ISBN: 1118618939 Category : Technology & Engineering Languages : en Pages : 368
Book Description
Mechanical Vibration and Shock Analysis, Second Edition Volume 4: Fatigue Damage Fatigue damage in a system with one degree of freedom is one of the two criteria applied when comparing the severity of vibratory environments. The same criterion is also employed for a specification representing the effects produced by the set of vibrations imposed in a real-world environment. In this volume, which is devoted to the calculation of fatigue damage, the author explores the various hypotheses and models used to describe the behavior of material suffering fatigue and the laws of fatigue accumulation. He also considers the methods of counting response peaks, which are used to establish a histogram when it is impossible to use the probability density of the peaks obtained with a Gaussian signal. The expressions for mean damage and its standard deviation are established and other hypotheses are tested. The Mechanical Vibration and Shock Analysis five-volume series has been written with both the professional engineer and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and extremely significant areas of mechanical engineering, from both a theoretical and practical point of view. The five volumes cover all the necessary issues in this area of mechanical engineering. The theoretical analyses are placed in the context of both the real world and the laboratory, which is essential for the development of specifications.
Author: J.W. Provan Publisher: Springer Science & Business Media ISBN: 9401727643 Category : Science Languages : en Pages : 477
Book Description
With the advent of the 80's there has been an increasing need for analytic and numerical techniques, based on a thorough understanding of microstructural processes, that express in a manner suitable for practicing engineers the reliability of components and structures that are being subjected to degradation situations. Such situations fall within the framework offracture mechanics, fatigue, corrosion fatigue and pitting corrosion. Luckily, such techniques are now being developed and it was felt timely to combine in one volume reports by the leaders in this field who are currently making great strides towards solving these problems. Hence the idea of this monograph was born and I am pleased to be associated both with it and the contributors whose chapters are included in this volume. A very large part of the credit for this monograph must go to the authors who have taken time out from their busy schedules to prepare their submissions. They have all worked diligently over the last few months in order to get their manuscripts to me on time and I sincerely thank them for their help throughout the preparation of this volume.
Author: G. Lütjering Publisher: Elsevier ISBN: 008055282X Category : Technology & Engineering Languages : en Pages : 755
Book Description
The aim of the 6th International Fatigue Congress, besides covering the entire field of fatigue, was to promote the intimate connection between basic science and engineering application by the selection of appropriate session topics. Fatigue is the main cause of failure of engineering structures and components. Making reliable fatigue predictions is highly difficult because knowledge about fatigue mechanisms in all stages of the fatigue process must be developed much further. In addition, the decreasing availability of raw materials and energy resources forces engineers to continually reduce the weight of constructions. This congress presents research results also particularly for new materials, including composites. Researchers, on the other hand, are confronted with the engineering demands. Futhermore, the overwhelming development which is presently taking place in the field of computer software and hardware dealing with fatigue problems is outlined along with the directions of future developments in all areas of fatigue. Close to 300 fully peer-reviewed papers are published in the proceedings, including nearly 30 overview and keynote papers covering the various session topics. The proceedings should therefore serve as a comprehensive review of the fatigue field at the present state-of-the-art, suitable for scientists, engineers and students.
Author: S. H. Smith
Author: S. H. Smith
Author: James M. Larsen
Author: Christian Lalanne
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Author: Todd P. Albertson
Author: J. B. Chang
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Author: J.W. Provan
Author: G. Lütjering