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 Crack Tip Stress Distributions by X Ray Diffraction written by JE. Allison and published by . This book was released on 1979 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Crack-tip stress distributions were measured on the surface of fatigue-cracked specimens of 1045 steel using a semiautomatic X-ray diffraction technique. The influence of overload cycles and crack extension on crack-tip stress profiles was studied. These overload-influenced stress profiles were observed to follow current analytical models generally. Overload cycles were shown to have a strong effect on subsequent residual and applied stress profiles. It was deduced that overload-induced crack-tip residual stresses are tensile on the interior of the specimen, the implication being that crack growth retardation may thus be a surface related phenomenon. Crack tip applied stresses were also measured and were found to be consistent with simple models for the crack tip applied stress profile.
Download or read book X Ray Diffraction Measurements of Crack Tip Stresses as a Crack Advances Through a Single Overload Affected Zone written by Donald R. Holloway and published by . This book was released on 1979 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress levels were measured in the vicinity of a crack tip using an x-ray diffraction technique to determine the correlation of these measurements with crack closure and residual stress theories. A single tensile overload was applied to a modified compact specimen of 1020 steel. The material had been heat-treated to obtain an ASTM grain size of 10 to 11 and a yield strength of 70 ksi. Crack tip residual stresses were measured in the unloaded condition and crack tip applied stresses were measured under load. These measurements were made as the crack was extended into and past the overload affected zone. Results suggested that overload retardation was primarily due to residual compressive stresses generated at the point of overload. It was observed that the effect of the overload had dissipated by the time the crack was propagated through a distance approximately equal to the plastic zone caused by the overload.
Download or read book X ray Diffraction Measurements of Crack Tip Stresses as a Crack Advances Through a Single Overload Affected Zone written by Donald R. Holloway and published by . This book was released on 1979 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stress levels were measured in the vicinity of a crack tip using an x-ray diffraction technique to determine the correlation of these measurements with crack closure and residual stress theories. A single tensile overload was applied to a modified compact specimen of 1020 steel. The material had been heat-treated to obtain an ASTM grain size of 10 to 11 and a yield strength of 70 ksi. Crack tip residual stresses were measured in the unloaded condition and crack tip applied stresses were measured under load. These measurements were made as the crack was extended into and past the overload affected zone. Results suggested that overload retardation was primarily due to residual compressive stresses generated at the point of overload. It was observed that the effect of the overload had dissipated by the time the crack was propagated through a distance approximately equal to the plastic zone caused by the overload.
Download or read book Fracture Mechanics written by Thomas A. Cruse and published by ASTM International. This book was released on 1988 with total page 796 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Fracture Mechanics written by Lawrence Kai Lai Tu and published by . This book was released on 1975 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Transactions of the JSNDI written by H. Kato and published by CRC Press. This book was released on 1991 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comprehensive Materials Processing written by and published by Newnes. This book was released on 2014-04-07 with total page 5485 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive Materials Processing, Thirteen Volume Set provides students and professionals with a one-stop resource consolidating and enhancing the literature of the materials processing and manufacturing universe. It provides authoritative analysis of all processes, technologies, and techniques for converting industrial materials from a raw state into finished parts or products. Assisting scientists and engineers in the selection, design, and use of materials, whether in the lab or in industry, it matches the adaptive complexity of emergent materials and processing technologies. Extensive traditional article-level academic discussion of core theories and applications is supplemented by applied case studies and advanced multimedia features. Coverage encompasses the general categories of solidification, powder, deposition, and deformation processing, and includes discussion on plant and tool design, analysis and characterization of processing techniques, high-temperatures studies, and the influence of process scale on component characteristics and behavior. Authored and reviewed by world-class academic and industrial specialists in each subject field Practical tools such as integrated case studies, user-defined process schemata, and multimedia modeling and functionality Maximizes research efficiency by collating the most important and established information in one place with integrated applets linking to relevant outside sources
Download or read book Practical Residual Stress Measurement Methods written by Gary S. Schajer and published by John Wiley & Sons. This book was released on 2013-08-01 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: An introductory and intermediate level handbook written in pragmatic style to explain residual stresses and to provide straightforward guidance about practical measurement methods. Residual stresses play major roles in engineering structures, with highly beneficial effects when designed well, and catastrophic effects when ignored. With ever-increasing concern for product performance and reliability, there is an urgent need for a renewed assessment of traditional and modern measurement techniques. Success critically depends on being able to make the most practical and effective choice of measurement method for a given application. Practical Residual Stress Measurement Methods provides the reader with the information needed to understand key residual stress concepts and to make informed technical decisions about optimal choice of measurement technique. Each chapter, written by invited specialists, follows a focused and pragmatic format, with subsections describing the measurement principle, residual stress evaluation, practical measurement procedures, example applications, references and further reading. The chapter authors represent both international academia and industry. Each of them brings to their writing substantial hands-on experience and expertise in their chosen field. Fully illustrated throughout, the book provides a much-needed practical approach to residual stress measurements. The material presented is essential reading for industrial practitioners, academic researchers and interested students. Key features: • Presents an overview of the principal residual stress measurement methods, both destructive and non-destructive, with coverage of new techniques and modern enhancements of established techniques • Includes stand-alone chapters, each with its own figures, tables and list of references, and written by an invited team of international specialists
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1974 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fracture Mechanics written by National Symposium on Fracture Mechanics and published by ASTM International. This book was released on 1979 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ASTM Special Technical Publication written by and published by . This book was released on 1979 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residual Stresses III written by Nihon Zairyō Gakkai and published by . This book was released on 1992 with total page 766 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 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frattura ed Integrit Strutturale Annals 2014 written by Luca Susmel and published by Gruppo Italiano Frattura. This book was released on 2014-09-12 with total page 1208 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Japanese Science and Technology 1983 1984 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch and published by . This book was released on 1985 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Fracture Research written by B.L. Karihaloo and published by Elsevier. This book was released on 2012-12-02 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fracture is a major cause of failure in metallic and non-metallic materials and structures. An understanding of the micro- and macro- mechanisms of fracture enables materials scientists to develop materials with high fracture resistance, which in turn helps engineers and designers to ensure the soundness and integrity of structures made from these materials. The International Congress on Fracture is held every four years and is an occasion to take stock of the major achievements in the broad field of fracture, to honour those who have made lasting contributions to this field, and to reflect on the future directions. ICF9 is published in six volumes covering the areas of:-- Failure Analysis, Remaining Life Assessment, Life Extension and Repair- Failure of Multiphase and Non-Metallic Materials- Fatigue of Metallic and Non-Metallic Materials and Structures- Theoretical and Computational Fracture Mechanics and New Directions- Testing and Characterization Methods, and Interfacial Fracture Mechanics- High Strain Rate Fracture and Impact Mechanics.
