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Development Of A Scatter Factor Applicable To Aircraft Fatigue Life
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Book Synopsis Development of a Scatter Factor Applicable to Aircraft Fatigue Life by : L. F. Impellizzeri
Download or read book Development of a Scatter Factor Applicable to Aircraft Fatigue Life written by L. F. Impellizzeri and published by . This book was released on 1966 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scatter in fatigue test results is one of the more important factors to be considered in predicting a safe service life for aircraft. A scatter factor is developed using statistical techniques to cover the variation in fatigue life among nominally identical specimens subjected to identical loading histories. A procedure is included to handle those cases where the life demonstrated in the laboratory is a least-of-two test result. The statistical analysis is supplemented by a review of numerous constant- and variable-amplitude test results which reveals that the log normal distribution is applicable and the standard deviation of log life is constant within a certain range of average cycles to failure. Fatigue test results of 120 composite aluminum structures are utilized to compute an unbiased sample standard deviation. A significant development of the derived statistical approach is the removal of the necessity to determine confidence intervals for the true mean and standard deviation. This is accomplished by the introduction of a new random variable from which these unknown population parameters vanish.
Book Synopsis Fatigue Strength Design and Analysis of Aircraft Structures by : Paul R. Abelkis
Download or read book Fatigue Strength Design and Analysis of Aircraft Structures written by Paul R. Abelkis and published by . This book was released on 1967 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aircraft fatigue strength design and analysis concepts were investigated in the areas of fatigue life scatter factors and fatigue strength design-analysis charts. A fatigue scatter factor is defined as the ratio of the mean life to the life for a specified probability of failure and confidence level. For design purposes, operational life scatter factor are defined in terms of the joint probability distribution of the applied loads spectra variation in a fleet of aircraft and the basic fatigue life scatter represented by fatigue test data. Basic fatigue life scatter properties for aluminum alloy materials and structures were statistically derived from a fatigue test data survey of over 6,000 specimens. The basic scatter derived frequency and probability distributions greatly deviate from the log Normal distribution beyond micron + or -2 sigma. Several joint probability distribution models illustrate the procedure of calculating operational life scatter factors. An actual aircraft service failure history is accurately predicted by the joint probability distribution concept. A procedure for the development of fatigue strength design-analysis charts is outlined and illustrated by several examples. The charts, in the form of damage rate curves, are defined by generalized loads spectra parameters and the fatigue quality of the structural element.
Book Synopsis Fatigue in Aircraft Structures by : United States. Air Force. Air Research and Development Command
Download or read book Fatigue in Aircraft Structures written by United States. Air Force. Air Research and Development Command and published by . This book was released on 1956 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Fatigue in Aircraft written by and published by . This book was released on 1966 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Damage, Crack Growth and Life Prediction by : F. Ellyin
Download or read book Fatigue Damage, Crack Growth and Life Prediction written by F. Ellyin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Fatigue Design Procedures by : E. Gassner
Download or read book Fatigue Design Procedures written by E. Gassner and published by Elsevier. This book was released on 2014-05-16 with total page 535 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fatigue Design Procedures presents the full text of the papers presented at the 4th Symposium of the International Committee on Aeronautical Fatigue held in Munich, Germany on June 16-18, 1965, and summaries of the discussion held about them. The papers featured in the volume covers different aspects of fatigue design. These include fail-safe design for a jet transport airplane, the weapon systems fatigue certification program of the U.S. Air Force, the role of variable amplitude or constant amplitude tests in design studies, the evaluation of allowable design stress and corresponding fatigue life, and the importance of fatigue design testing. This book will be of interest to persons dealing with studies on fatigue design methods.
Book Synopsis Fatigue Analysis of a Paper Airplane by : Michael R. Urban Ph.D.
Download or read book Fatigue Analysis of a Paper Airplane written by Michael R. Urban Ph.D. and published by Covenant Books, Inc.. This book was released on 2023-10-02 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accounting for fatigue loadings has been a concern ever since the widespread introduction of metallic materials into load-bearing components in the nineteenth century. Calculations were developed based on the analysis capabilities of their time incorporating all the latest technologies of their era. At the time, that technology was pencil-and-paper calculations. Today's calculations are computer-based. The widespread use of computing methods has greatly enhanced the analyst abilities for simulating internal stress and strain fields. Unfortunately, current fatigue analyses often force-fit current stress field calculations into fatigue analysis methods meant for nineteenth century stress calculation methods. It's never a good idea to force methods optimized for pre-computer calculations to work with computers. This text presents a more integrated approach to computer-based fatigue analysis methods. Like what was originally done, the latest technologies are applied rather than force-fitting computer computational capabilities into nineteenth-century techniques. Holistic approaches incorporating all knowledge have long been established as the most successful approach to problem-solving. Incorporating all knowledge with the most modern capabilities is the preferred approach. Holistic methods strive to reduce subjective inputs and replace them with consistent objective ones. This text aims to transition disjointed inefficient analyses into a unified computer-based holistic technique by introducing a fatigue analysis method specifically developed for computer simulations. Ultimately, for any method or theory to be valuable, it must be put into practice and prove itself. That entails leadership decision-making. Engineering design development activities will lead to final decisions. Information in a holistic approach must include the reliability of the information. How consistent are the predictions? Are the two types of potential scatter, analytic, and physical properly addressed? Is analytic scatter minimized while maintaining creativity? Is physical scatter totally understood? Effective program management requires knowledge on both types of scatter and, most importantly, the ability to realize the difference. A novel computer-based unified approach to fatigue methods is presented which incorporates a holistic approach for more accurate and consistent analyses, including the management and leadership of fatigue analysis projects, minimization of analytic scatter, management of physical scatter, and unification of methods that minimize subjective inputs often needed to bridge inconsistent techniques.
Book Synopsis Mechanical Vibration and Shock Analysis, Fatigue Damage by : Christian Lalanne
Download or read book Mechanical Vibration and Shock Analysis, Fatigue Damage written by Christian Lalanne and published by John Wiley & Sons. This book was released on 2013-03-04 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Probabilistic fracture mechanics and reliability by : J.W. Provan
Download or read book Probabilistic fracture mechanics and reliability written by J.W. Provan and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Materials, Experimentation and Design in Fatigue by : F. Sherratt
Download or read book Materials, Experimentation and Design in Fatigue written by F. Sherratt and published by . This book was released on 1981 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fatigue Damage written by Christi Lalanne and published by CRC Press. This book was released on 2002-03-29 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: About the Series: This important new series of five volumes has been written with both the professional engineers and the academic in mind. Christian Lalanne explores every aspect of vibration and shock, two fundamental and crucially important areas of mechanical engineering, from both the theoretical and practical standpoints. As all products need to be designed to withstand the environmental conditions to which they are likely to be subjected, prototypes must be verified by calculation and laboratory tests, the latter according to specifications from national or international standards. The concept of tailoring the product to its environment has gradually developed whereby, from the very start of a design project, through the to the standards specifications and testing procedures on th e prototype, the real environment in which the product being tested will be functioning is taken into account. The five volumes of Mechanical Shock and Vibration cover all the issues that need to be addressed in this area of mechanical engineering. The theoretical analyses are placed in the context of the real world and of laboratory tests - essential for the development of specifications. Volume IV: 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 specifciation representing the effects produced by the set of vibrations imposed in a real environment. In this volume, which is devoted to the calculation of fatigue damage, the author explores the hypotheses adopted to describe the behavior of material suffering fatigue and the laws of fatigue accumulation. He also considers the methods of counting the response peaks, which are used to establish the 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.
Book Synopsis Development of Fatigue Loading Spectra by : John M. Potter
Download or read book Development of Fatigue Loading Spectra written by John M. Potter and published by ASTM International. This book was released on 1989 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Exploitation of Structural Loads/health Data for Reduced Life Cycle Costs by : North Atlantic Treaty Organization. Applied Vehicle Technology Panel. Specialists' Meeting
Download or read book Exploitation of Structural Loads/health Data for Reduced Life Cycle Costs written by North Atlantic Treaty Organization. Applied Vehicle Technology Panel. Specialists' Meeting and published by . This book was released on 1998 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reliability Assessment of Aircraft Structures Based on Probabilistic Interpretation of the Scatter Factor by :
Download or read book Reliability Assessment of Aircraft Structures Based on Probabilistic Interpretation of the Scatter Factor written by and published by . This book was released on 1975 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 'scatter factor' S as used in fatigue design of aircraft is defined as the ratio between the location parameter (estimate) of the 'population' of all aircraft, obtained from n full-scale tests, and the first failure in a fleet of m aircraft. Introducing the Third Asymptotic distribution of smallest values for the fatigue life of the population, this definition produces a Pareto-type distribution of the scatter-factor, on the basis of which S can be related to the numbers n and m and the reliability level R. Tables of S for different combinations of n, m, R and the 'minimium fatigue life' are evaluated. Useful values of the scatter factor for different materials and purposes are suggested.
Download or read book Aircraft Fatigue written by J. Y. Mann and published by Elsevier. This book was released on 2013-10-22 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aircraft Fatigue: Design, Operational and Economic Aspects contains the proceedings of the ""Symposium on Aircraft Fatigue—Design, Operational and Economic Aspects,"" held in Melbourne, Australia, on May 22-24, 1967. The papers explore the design and operational aspects of the fatigue problem in general aviation and transport aircraft, as well as the economic aspects of the fatigue problem as it affects both operators and manufacturers. This book is comprised of 21 chapters and begins with a description of an approach to structural reliability analysis based on order statistics and the expected time to first failure in a fleet of specified magnitude, along with its application to structures subject to progressive fatigue damage. The following chapters deal with structural load measurement and analysis; design and certification programs for a wide range of aircraft types including the Anglo-French and American civil supersonic transports; acoustic fatigue; and the design of joints. The detection of fatigue cracks in service and the effects of fatigue on the cost of design and operation of aircraft are also discussed. This monograph will be a useful resource for aircraft and aeronautical engineers as well as officials of civil aviation.
Book Synopsis Reliability Abstracts and Technical Reviews by :
Download or read book Reliability Abstracts and Technical Reviews written by and published by . This book was released on 1966 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bibliography on the Fatigue of Materials, Components and Structures by : J. Y. Mann
Download or read book Bibliography on the Fatigue of Materials, Components and Structures written by J. Y. Mann and published by Elsevier. This book was released on 2013-09-03 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bibliography on the Fatigue of Materials, Components and Structures, Volume 4: 1966 - 1969 presents the publications relevant to the study of materials science, particularly fatigue. The selection presents materials that cover fixed and mobile structures for use on land, sea and air; pressure vessels and nuclear reactors; mechanical components; and surgical implants. The publications presented tackle the developments in technological processes, evaluation of fatigue performance. The selection also covers the fundamental research on the subject and the development of theories. The book will be of great interest to students, researchers, and practitioner of materials science.
