Download or read book X ray Diffraction Study of the Effects of Uniaxial Plastic Deformation on Residual Stress Measurements written by A. L. Esquivel and published by . This book was released on 1968 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: Uniaxial plastic deformation has been known to produce anomalies in residual stress measurements based on x-ray diffraction techniques. This study was undertaken to determine the magnitude of the effects, if any, on residual stress calculations from various materials subjected to UPD. An x-ray diffraction study using the two-exposure method was made on several iron, aluminum, and titanium alloys before and after these alloys were deformed plastically by bending on a U-bend test fixture. The x-ray peak shifts were recorded and the x-ray stress factors calculated by three different methods. These results are discussed together with observations on the additivity of residual and applied stresses, and the per cent differences in the stress measurements based on stress factors calculated by three different methods. (Author).

Download or read book Residual Stress written by Ismail C. Noyan and published by Springer. This book was released on 2013-03-07 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book International Conference on Residual Stresses written by G. Beck and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 1043 pages. Available in PDF, EPUB and Kindle. Book excerpt: Residual stresses are always introduced in materials when they are produced, or when they undergo non-uniform plastic deformation during use. The circumstances that can cause residual stresses are therefore numerous. Residual stresses exist in all materials and, depending on their distribution, can playa beneficial role (for example, compressive surface stress) or have a catastrophic effect, especially on fatigue behaviour and corrosion properties. The subject of residual stresses took form around 1970 with the development of methods to measure macroscopic deformations during the machining of materials or on an atomic scale by X-ray diffraction. These techniques have made considerable progress in the last 20 years. The meetings organized in several countries (Germany, France, Japan, etc. ) have largely contributed to this progress, aided by the numerous exchanges of information and knowledge to which they have given rise. Studies of the formation of residual stresses began more slowly, but have progressed with the emergence of increasingly realistic models of materials behaviour and with access to ever more powerful codes for numerical calculations. Two successive meetings for discussing this topic have been held in Europe. The first, held in 1982 in Nancy (France), consisted of 30 participants from 5 countries. The second was held in Linkoping (Sweden) in 1984, with 80 participants of 16 nationalities. It was decided to hold a first International Conference, ICRS, to address all aspects of the problem. Held in 1986 in Garmisch-Partenkirschen (FRG), it was an assembly of neady 300 participants from 21 countries.

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 Measurement of Residual Stress by X ray Diffraction written by A. L. Esquivel and published by . This book was released on 1964 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the measurement of residual stresses, x-ray diffraction is potentially the best nondestructive method available. Ex periments are described in which silicon bronze and alpha brass samples were examined by x-rays while subjected to tensile deformation. The positions of the diffraction lines and their breadths were measured and analyzed. The special features of the experimental arrangement employed are presented and the method of analysis explained. An important result of this study is the observation that the stress-strain curve obtained from the x-ray diffraction measurements follows the stress-strain curve obtained from a standard tensile test, contrary to what many previous investigators have reported with different experimental techniques. Furthermore, for materials which may form stacking faults upon deformation, the x-ray data must first be corrected for the effects produced from stacking faults before the stress is calculated. (Author).

Download or read book X Ray Diffraction Studies on the Deformation and Fracture of Solids written by Kazuyoshi Tanaka and published by Elsevier. This book was released on 2017-01-24 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume covers current research findings and engineering applications of X–ray methods by the Japanese X–ray group members. The first part of the volume deals with fundamental problems in the methods for X–ray stress measurement. Phase stresses in the constituent phases of ceramic composites and ceramic-fiber reinforced metal-matrix composites are separately measured by X–rays, while three-dimensional stresses and thermal stresses in composites measured by X–rays are compared with the theoretical and numerical analyses. This work will therfore provide significant information for designing high-performance composites. Other topics covered include synchrotron X–ray radiation and the analysis of X–ray data by the Guassian curve method. Part two is devoted to the application of X–ray diffraction methods for various engineering purposes, the residual stress and half-value breadth (the full width at half the maximum) of the diffraction profiles being the two main X–ray parameters utilized in those applications. Chapters are included on X–ray fractography, a powerful technique for failure analysis, which is applied to the brittle fracture of ceramics and to the fatigue fracture of steels under various service conditions.

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the Annual Conference on Industrial Applications of X ray Analysis written by and published by . This book was released on 1969 with total page 672 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1058 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Analysis of Residual Stress by Diffraction using Neutron and Synchrotron Radiation written by M.E. Fitzpatrick and published by CRC Press. This book was released on 2003-02-06 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: While residual stress can be a problem in many industries and lead to early failure of component, it can also be introduced deliberately to improve lifetimes. Knowledge of the residual stress state in a component can be critical for quality control of surface engineering processes or vital to performing an accurate assessment of component life unde

Download or read book Advances in X ray Analysis written by and published by . This book was released on 1983 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Crystal Plasticity Finite Element Methods written by Franz Roters and published by John Wiley & Sons. This book was released on 2011-08-04 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written by the leading experts in computational materials science, this handy reference concisely reviews the most important aspects of plasticity modeling: constitutive laws, phase transformations, texture methods, continuum approaches and damage mechanisms. As a result, it provides the knowledge needed to avoid failures in critical systems udner mechanical load. With its various application examples to micro- and macrostructure mechanics, this is an invaluable resource for mechanical engineers as well as for researchers wanting to improve on this method and extend its outreach.

Download or read book U S Government Research Development Reports written by and published by . This book was released on 1966-11 with total page 1014 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Journal of Analytical Chemistry of the USSR written by and published by . This book was released on 1971-07 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Industrial Laboratory written by and published by . This book was released on 1971-06 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An X Ray Diffraction Study of the Residual Stress Strain Distribution in Shot Peened Two Phase Brass written by I. C. Noyan and published by . This book was released on 1985 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray residual stress determination and line broadening analysis were used to study the deformation distributions existing in the surface layers of a shot-peened two-phase brass specimen. The results indicate inhomogeneous partitioning of the plastic strains between the alpha- beta-strains, as well as between the surface layers and the bulk. The microstresses, which occur due to differential deformation between alpha and beta strains, have a maximum in the beta-grains at the material surface, while the macro-residual stresses, which arise due to differential plastic deformation between the surface and the bulk, exhibit a maximum deeper in the material. A qualitative model (describing these residual stress profiles in terms of the plastic strains caused by the peening operation) is presented. Originator supplied keywords include: residual stresses, two-phase materials, peening, shot-peening, alpha brass.