Instability of Clamped-Hinged Circular Arches Subjected to a Point Load
D. A. DaDeppo and R. Schmidt
J. Appl. Mech.
42(4),
894-896 (Dec 01, 1975)
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Posted by: asim99 - 03-04-2013, 06:25 AM - Forum: General Books
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IIW Recommendations on Methods for Improving the Fatigue Strength of Welded Joints IIW-2142-110.
Author: P. J. Haagensen and S. J. MaddoxOxford | Size: 4 MB | Format:PDF | Quality:Unspecified | Publisher: Woodhead Pub Ltd | Year: 2013 | pages: 46 | ISBN: 9781782420644
The weld toe is a primary source of fatigue cracking because of the severity of the stress concentration it produces. Weld toe improvement can increase the fatigue strength of new structures significantly and can also be used to repair or upgrade existing structures. However, practitioners have reported wide variations in the actual improvements in fatigue strength. Based on an extensive testing program organized by the International Institute of Welding (IIW), this report reviews the main methods for weld toe improvement to increase fatigue strength: burr grinding, TIG dressing and hammer and needle peening. The report provides specifications for the practical use of each method, including equipment, weld preparation and operation. It also offers guidance on inspection, quality control and training as well as assessments of fatigue strength and thickness effects possible with each technique. These recommendations will allow for a more consistent use of these methods and more predictable increases in fatigue strength.
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The notch stress approach for fatigue assessment of welded joints is based on the highest elastic stress at the weld toe or root. In order to avoid arbitrary or infinite stress results, a rounded shape with a reference radius instead of the actual sharp toe or root is usually assumed.Wolfgang Fricke reviews different proposals for reference radii together with associated S-N curves. The guidelines give detailed recommendations for the numerical analysis of notch stress by the finite or boundary element method and present appropriate S-N curves for the assessment of the fatigue strength of different materials. Finally, four examples illustrate the application of the approach as well as the variety of structures which can be analyzed and the range of results which can be obtained from different models. Published in Association with the International Institute of Welding (IIW).
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The energy, petrochemical, aerospace and other industries all require materials able to withstand high temperatures. High temperature strength is defined as the resistance of a material to high temperature deformation and fracture. This important book provides a valuable reference to the main theories of high temperature deformation and fracture and the ways they can be used to predict failure and service life.
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This handbook provides a comprehensive analysis of the current state of welding technology as applied to large structures and process plant. The author takes account of the increasing necessity for engineers at all levels to be aware of problems such as fatigue failure and provides advice.
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Professor Nedoseka presents an essential guide to the key principles and problems involved in the analysis of welded structures. In the introductory chapter, he discusses design issues, key equations and calculations, and the effects of varied heat sources in relation to the temperature field in welding. Subsequent chapters explore welding stresses and strains and fracture mechanics, the load carrying capacity of welded structures, diagnostics and prediction of the residual life of welded structures and acoustic emission techniques for the analysis of welded structures. The conclusion supplies supplementary information on numerical techniques and other tests for welded structures.
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Posted by: asim99 - 03-03-2013, 05:54 AM - Forum: General Books
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Principles of Physics, For Scientists and Engineers
Author: Hafez A. Radi, John O. Rasmussen | Size: 59 MB | Format:PDF | Quality:Unspecified | Publisher: Springer | Year: 2013 | pages: 1039 | ISBN: 9783642230257
This textbook presents a basic course in physics to teach mechanics, mechanical properties of matter, thermal properties of matter, elementary thermodynamics, electrodynamics, electricity, magnetism, light and optics and sound. It includes simple mathematical approaches to each physical principle, and all examples and exercises are selected carefully to reinforce each chapter. In addition, answers to all exercises are included that should ultimately help solidify the concepts in the minds of the students and increase their confidence in the subject. Many boxed features are used to separate the examples from the text and to highlight some important physical outcomes and rules. The appendices are chosen in such a way that all basic simple conversion factors, basic rules and formulas, basic rules of differentiation and integration can be viewed quickly, helping student to understand the elementary mathematical steps used for solving the examples and exercises. Instructors teaching form this textbook will be able to gain online access to the solutions manual which provides step-by-step solutions to all exercises contained in the book. The solutions manual also contains many tips, colored illustrations, and explanations on how the solutions were derived.
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Effect of Openings on Elephant’s Foot Buckling of Large Oil Tanks
Author: Zhi Ping Chen, Shun Juan Yan, Chu Lin Yu, Guo Wei Cao, Lei Wang, Li Cai Yang | Size: 1 MB | Format:PDF | Quality:Unspecified | Publisher: Scientific.Net | Year: 2010 | pages: 5
Large non-anchored welded steel oil tanks are important equipments that are renowned for their extremely large structures, they are vulnerable to elephant’s foot buckling failure which can cause serious damages in seismic. Generally, locations of tank openings are at the first layer of shell course which are just close to elephant’s foot buckling position of oil tanks. While learning the effect of openings on elephant’s foot buckling of oil tanks, the welding residual deformation was assumed to be initial geometric imperfections. Numerical simulation method was adopted to analyze the effect of three factors (oil tanks with or without openings, opening sizes and opening positions) on elephant’s foot buckling critical load of oil tanks. Results show that the openings and reinforcement plates are beneficial to the increase of buckling critical load; the size and location of the openings have little effect on the buckling critical load.
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Like never before we are aware of the crucial place of bridges in our lives. The spans that warranted little notice are now at the forefront of public and political debate and we are reminded of the rich history-and the uncertain future-of bridging in Minnesota. Historian Denis P. Gardner documents and celebrates a wide range of the state’s rural and urban spans, telling the remarkable stories of their construction and impact on Minnesota life and culture. From Pratt trusses to bowstring arches, Wood, Concrete, Stone, and Steel describes nearly every bridge type found in Minnesota, including railroad spans, and features more than 225 illustrations of historical and extant bridges. Gardner details the development of engineering and construction innovations (complete with a guide to trusses) and traces the fascinating politics and personalities behind the task of creating and maintaining safe, and often beautiful, crossings. Through arresting photographs and lively narrative, Gardner makes a compelling argument for the value of preserving our bridges and the cultural heritage they carry and brings to life their importance in Minnesota’s past, present, and future. Denis P. Gardner is an award-winning historian who has documented properties for the National Register of Historic Places and the Historic American Engineering Record. He is the author of Minnesota Treasures: Stories behind the State’s Historic Places. Eric DeLony is former director of the Historic American Engineering Record.
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