Download or read book Study of the Precision of X Ray Stress Analysis written by M. R. James and published by . This book was released on 1976 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Software is described for complete computer control of residual stress measurements. One program (that incorporates either the two tilt method, the sin squared psi procedure, or the Cohen-Marion technique) has been developed for use with either a normal detector or a position sensitive detector. The operator inputs the desired error in stress and various instrumental parameters that determine systematic errors. The counting strategy to obtain the total error is then determined by the software. Employing this automated system, an investigation of a parabolic fit to the top of a diffraction profile indicates that a three point fit is satisfactory only for sharp profiles. Surprisingly, with a standard detector for fixed total time of data accumulation, the sin squared psi procedure gives better precision than the two tilt method. A position sensitive detector system exhibited excellent precision in replicate residual stress measurements. Errors of + or - 6000 psi were obtained on samples having broad diffraction profiles in only 30 seconds. It was also found that sample displacement is less important for stationary slit geometry than with parafocusing technique. Parallel beam geometry shows minimal effects due to sample displacement (as is well known) but precision of the residual stress measurement decreases because this procedure broadens the diffraction profile. Design parameters for a portable unit based on these results are discussed. This research was supported by the U.S. Office of Naval Research. (Author).
Download or read book Proceedings of a Symposium on Accuracy in Powder Diffraction Held at the National Bureau of Standards Gaithersburg Maryland June 11 15 1979 written by Stanley Block and published by . This book was released on 1980 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Measurement of Crack Tip Stresses by X ray Diffraction written by John Edmond Allison and published by . This book was released on 1978 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: To ensure the structural integrity of present day structures subjected to variable amplitude cyclic stress histories, a knowledge of the crack tip stress field is important. In this investigation, crack tip stresses were measured in specimens of 1020 and 1045 steel using a semi-automatic x-ray diffraction technique. Crack tip residual stresses were measured in the unloaded condition and crack tip 'applied' stresses were measured under load. It was observed that, for the alloys tested and within the confines of stress analysis by x-ray diffraction, a dependence exists for the maximum crack tip residual stress on the level of the previous stress intensity factor and also for the maximum crack tip 'applied' stress on the level of the applied stress intensity. This is in sharp contrast to theoretical models of the crack tip stress fields which predict an independence between crack tip stresses and stress intensity levels. Crack tip stresses were observed relative to the fatigue crack growth retardation process. Post overload crack tip stresses were greatly reduced from their pre-overload levels. Limited studies indicated that crack growth, after an overload, had little or no effect on the overload-induced crack tip residual stress distribution. Measurements taken at applied loads, indicated that portions of the material behind the tip of the extended crack were in compression while areas ahead of the extended crack were in tension. These results were considered in light of possible retardation mechanisms.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 996 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Special Publication written by and published by . This book was released on 1980 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography on X ray Stress Analysis written by Herbert Rudolf Isenburger and published by . This book was released on 1953 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Precision X ray Stress Analysis of Uranium and Zirconium written by Edward Carringer House and published by . This book was released on 1959 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book X Ray Measurement of Residual Stress Using a Precision Specimen Stage written by Roderick Durrett Stroud and published by . This book was released on 1980 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1974 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in X ray Analysis written by and published by . This book was released on 1987 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods of Residual Stress Measurement written by and published by . This book was released on 1965 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual has been assembled as a ready reference source for the engineer who must measure residual stresses. Although the literature has abundant information on the individual methods of residual stress measurement, this manual is unique in that most of the useful methods have been selected, described, classified, and compared.Methods of measuring residual stress may be classified as mechanical, physical, or chemical. Mechanical methods that are most widely used involve the machining of the part to release the residual stresses. These methods are considered in detail and occupy the bulk of this manual.Of the physical methods, x-ray diffraction has many advantages in solving some residual stress problems. One of the major advantages is that it is completely nondestructive if only surface residual stresses are desired. This method is briefly described and its limitations discussed so that the investigator may choose this method if it fulfills his needs. The method and the necessary techniques have been covered in detail in Ref. 1.Of the chemical methods, the stress corrosion cracking technique seems to be the most useful. This cracking is known to be dependent upon the surface tensile stress level. At present it is only a qualitative measure of the stress, but perhaps at some future date, quantitative chemical methods may be developed.To make residual stress measurements, the engineer must: 1Select the most appropriate method. 2Completely familiarize himself with the theory behind the method chosen. 3Learn the techniques of measurement used by previous investigators.Note that the word "method" is reserved to mean the individual category of stress analysis, and that "technique" applies to the experimental procedure.The choice of the method depends to a large extent upon the geometry of the specimen, the precision desired, the type and location of the stress it is desired to measure, and the equipment available. The numerous mechanical methods available are classified into four groups. These are: the parting-out method, the layer removal method, the boring and turning method, and the hole drilling method. The nonmechanical x-ray method is briefly discussed here for comparison.Once the method has been selected, measurements should not be taken and their values blindly substituted into equations. Each term in the expressions relating the deformation to the residual stress should be completely understood and the sign convention used for these terms should be well known. For this reason, a derivation for each method has been included with the necessary assumptions and limitations. Following a study of these equations, it may be decided whether some automatic or computer technique should be used. In some instances in which a large number of specimens are to be analyzed, the computer technique offers obvious advantages. At this point, it is also necessary to determine the precision with which the stresses are to be determined. This, of course, can be related directly to the precision used in the measurement of the deformation changes and the original dimensions of the specimen itself.The correct choice of the many and varied techniques for measuring dimensional changes used in the determination of residual stress is extremely important if accurate and reproducible data are to be obtained. Machining stress introduced in dissecting must not be larger or more significant than the stress that is to be measured. The techniques used to remove material are numerous, and some of the better currently used techniques are considered. The specific techniques associated with any particular method are included and special fixtures and procedures are described and sample calculations are given.
Download or read book Nondestructive Evaluation of Materials written by Volker Weiss and published by Springer Science & Business Media. This book was released on 2013-03-12 with total page 533 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Army Materials and Mechanics Research Center of Water town, Massachusetts in cooperation with the Materials Science Group of the Department of Chemical Engineering and Materials Science of Syracuse University has conducted the Sagamore Army Materials Research Conference since 1954. The main purpose of these conferences has been to gather together over 150 scientists and engineers from academic institutions, industry and government who are uniquely qualified to explore in depth a subject of importance to the Department of Defense, the Army and the scientific community. This volume NONDESTRUCTIVE EVALUATION OF MATERIALS, addresses the areas of x-ray, ultrasonics and other methods of nondestructive testing. We wish to acknowledge the dedicated assistance of Joseph M. Bernier of the Army Materials and Mechanics Research Center and Helen Brown DeMascio of Syracuse University throughout the stages of the conference planning and finally the publication of this book. Their help is deeply appreciated. Syracuse University Syracuse, New York The Editors Contents SESSION I X-RAY S. Heissman, Moderator H. K. Herglotz, Moderator 1. Overview of X-Ray Diffraction Methods for Nondestructive Testing • • • • • • • ••• 1 L. V. Azaroff 2. Detection of Fatigue Damage by X-Rays 21 S. Taira and K. Kamachi 3. A Historical Example of Fatigue Damage • • • • • • • 55 H. K. Herglotz 4. The Application of X-Ray Topography to Materials Science . . . . . . . . . . . . . . . . . . . . 69 S. Weissman 5.
Download or read book Precision X ray Stress Analysis of Uranium and Zirconium written by Edward C Wooden Bruce J House and published by Hassell Street Press. This book was released on 2021-09-10 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work has been selected by scholars as being culturally important and is part of the knowledge base of civilization as we know it. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
Download or read book Evaluation of X ray Elastic Constants Using X ray Diffraction Data for Residual Stress Analysis written by Jun Seok Park and published by . This book was released on 1991 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Springer Handbook of Experimental Solid Mechanics written by William N. Sharpe, Jr. and published by Springer Science & Business Media. This book was released on 2008-12-04 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Experimental Solid Mechanics documents both the traditional techniques as well as the new methods for experimental studies of materials, components, and structures. The emergence of new materials and new disciplines, together with the escalating use of on- and off-line computers for rapid data processing and the combined use of experimental and numerical techniques have greatly expanded the capabilities of experimental mechanics. New exciting topics are included on biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Presenting complete instructions to various areas of experimental solid mechanics, guidance to detailed expositions in important references, and a description of state-of-the-art applications in important technical areas, this thoroughly revised and updated edition is an excellent reference to a widespread academic, industrial, and professional engineering audience.
Download or read book The Measurement of Residual Stress with X Ray Diffraction written by Charles P. Gazzara and published by . This book was released on 1983 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A concise summary of the application of X-ray diffraction principles involved in the measurement of residual stresses is presented for those users of this technique having little exposure to this field. The latest developments in X-ray diffraction residual stress analysis, XRDRSA, are applied in simplified form so that this report can serve as a working manual. Five general areas are considered, namely: theory, history and progress, technical problems, apparatus, and examples of specific problems involving the measurement of residual stresses using X-ray diffraction procedures. Much of the material presented is the result of research (6.1) and Materials Testing Technology (MTT) projects conducted at AMMRFC and was presented at a seminar at the Naval Air Rework Facility in San Diego, Calif. on 18 and 19 November, 1981. (Author).
Download or read book Technical Report research Paper written by and published by . This book was released on 1957 with total page 842 pages. Available in PDF, EPUB and Kindle. Book excerpt:
