RESOLUTION OF THE TWENTIETH CENTURY CONUNDRUM IN ELASTIC STABILITY

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Resolution Of The Twentieth Century Conundrum In Elastic Stability

Author : Isaac Elishakoff
ISBN : 9789814583558
Genre : Technology & Engineering
File Size : 27.40 MB
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There have been stability theories developed for beams, plates and shells — the most significant elements in mechanical, aerospace, ocean and marine engineering. For beams and plates, the theoretical and experimental values of buckling loads are in close vicinity. However for thin shells, the experimental predictions do not conform with the theory, due to presence of small geometric imperfections that are deviations from the ideal shape. This fact has been referred to in the literature as ‘embarrassing’, ‘paradoxical’ and ‘perplexing’. Indeed, the popular adage, “In theory there is no difference between theory and practice. In practice there is”, very much applies to thin shells whose experimental buckling loads may constitute a small fraction of the theoretical prediction based on classical linear theory; because in practice, engineers use knockdown factors that are not theoretically substantiated. This book presents a uniform approach that tames this prima-donna-like and capricious behavior of structures that has been dubbed the ‘imperfection sensitivity’ — thus resolving the conundrum that has occupied the best minds of elastic stability throughout the twentieth century. Contents:IntroductionProbabilistic ResolutionHybrid Uncertainty in Imperfections and Axial LoadingNon-Probabilistic ResolutionNontraditional Imperfections in ShellsLower Bound for Buckling Load in Presence of Uncertainty Miscellaneous Topics Readership: Graduate Students, researchers, professionals in the field of mechanical engineering. Keywords:Stability;Imperfection-Sensitivity;Reliability
Category: Technology & Engineering

Fluid Structure Interactions

Author : Michael P. Paidoussis
ISBN : 9780123973139
Genre : Science
File Size : 41.37 MB
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The first of two books concentrating on the dynamics of slender bodies within or containing axial flow, Fluid-Structure Interaction, Volume 1 covers the fundamentals and mechanisms giving rise to flow-induced vibration, with a particular focus on the challenges associated with pipes conveying fluid. This volume has been thoroughly updated to reference the latest developments in the field, with a continued emphasis on the understanding of dynamical behaviour and analytical methods needed to provide long-term solutions and validate the latest computational methods and codes. In this edition, Chapter 7 from Volume 2 has also been moved to Volume 1, meaning that Volume 1 now mainly treats the dynamics of systems subjected to internal flow, whereas in Volume 2 the axial flow is in most cases external to the flow or annular. Provides an in-depth review of an extensive range of fluid-structure interaction topics, with detailed real-world examples and thorough referencing throughout for additional detail Organized by structure and problem type, allowing you to dip into the sections that are relevant to the particular problem you are facing, with numerous appendices containing the equations relevant to specific problems Supports development of long-term solutions by focusing on the fundamentals and mechanisms needed to understand underlying causes and operating conditions under which apparent solutions might not prove effective
Category: Science

Probabilistic Methods In The Theory Of Structures Strength Of Materials Random Vibrations And Random Buckling

Author : Elishakoff Isaac E
ISBN : 9789813149878
Genre : Technology & Engineering
File Size : 80.41 MB
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The first edition of this book appeared over three decades ago (Wiley-Interscience, 1983), whereas the second one saw light on the verge of new millennium (Dover, 1999). This is third, corrected and expanded edition that appears in conjunction with its companion volume Probabilistic Methods in the Theory of Structures: Complete Worked-Through Solutions. Thus, the reader is able to both get acquainted with the theoretical material and be able to master some of the problems, following Chinese dictum: I hear and I forget. I see and I remember. I do and I understand — Confucius. The main idea of the book lies in the fact that three topics: probabilistic strength of materials, random vibrations, and probabilistic buckling are presented in a single package allowing one to see the forest in between the trees. Indeed, these three topics usually are presented in separate manners, in different specialized books. Here, the reader gets a feeling of true unity of the subject at large in order to appreciate that in the end what one wants is reliability of the structure, in conjunction with its operating conditions. As the author describes in the Preface of the second edition, this book was not conceived ab initio, as a book that author strived to compose. Rather, it was forced, as it were, upon me due to two reasons. One was rather a surprising but understandable requirement in the venerable Delft University of Technology, The Netherlands to prepare the lecture notes for students with the view of reducing skyrocketing costs of acquisition of textbooks by the students. The other one was an unusually warm acceptance of the notes that the author prepared while at Delft University of Technology and later in Haifa, at the Technion-Israel Institute of Technology by the legendary engineering scientist Warner Tjardus Koiter (1914–1997). The energy necessary to prepare the second and third editions came from enthusiastic reviews that appeared in various sources. Author embraced the simplicity of exposition as the main virtue following Isaac Newton's view that "Truth is ever to be found in simplicity, and not in the multiplicity and confusion of things."
Category: Technology & Engineering

Numerical Analysis And Its Applications

Author : Ivan Dimov
ISBN : 9783642415159
Genre : Computers
File Size : 29.38 MB
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This book constitutes thoroughly revised selected papers of the 5th International Conference on Numerical Analysis and Its Applications, NAA 2012, held in Lozenetz, Bulgaria, in June 2012. The 65 revised papers presented were carefully reviewed and selected from various submissions. The papers cover a broad area of topics of interest such as numerical approximation and computational geometry; numerical linear algebra and numerical solution of transcendental equation; numerical methods for differential equations; numerical stochastics, numerical modeling; and high performance scientific computing.
Category: Computers

Forward Looking Decision Making

Author : Robert E. Hall
ISBN : 1400835267
Genre : Business & Economics
File Size : 69.36 MB
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Individuals and families make key decisions that impact many aspects of financial stability and determine the future of the economy. These decisions involve balancing current sacrifice against future benefits. People have to decide how much to invest in health care, exercise, their diet, and insurance. They must decide how much debt to take on, and how much to save. And they make choices about jobs that determine employment and unemployment levels. Forward-Looking Decision Making is about modeling this individual or family-based decision making using an optimizing dynamic programming model. Robert Hall first reviews ideas about dynamic programs and introduces new ideas about numerical solutions and the representation of solved models as Markov processes. He surveys recent research on the parameters of preferences--the intertemporal elasticity of substitution, the Frisch elasticity of labor supply, and the Frisch cross-elasticity. He then examines dynamic programming models applied to health spending, long-term care insurance, employment, entrepreneurial risk-taking, and consumer debt. Linking theory with data and applying them to real-world problems, Forward-Looking Decision Making uses dynamic optimization programming models to shed light on individual behaviors and their economic implications.
Category: Business & Economics

New Research Opportunities In The Earth Sciences

Author : Committee on New Research Opportunities in the Earth Sciences at the National Science Foundation
ISBN : 9780309219242
Genre : Science
File Size : 79.94 MB
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The 2001 National Research Council (NRC) report Basic Research Opportunities in Earth Science (BROES) described how basic research in the Earth sciences serves five national imperatives: (1) discovery, use, and conservation of natural resources; (2) characterization and mitigation of natural hazards; (3) geotechnical support of commercial and infrastructure development; (4) stewardship of the environment; and (5) terrestrial surveillance for global security and national defense. This perspective is even more pressing today, and will persist into the future, with ever-growing emphasis. Today's world-with headlines dominated by issues involving fossil fuel and water resources, earthquake and tsunami disasters claiming hundreds of thousands of lives and causing hundreds of billions of dollars in damages, profound environmental changes associated with the evolving climate system, and nuclear weapons proliferation and testing-has many urgent societal issues that need to be informed by sound understanding of the Earth sciences. A national strategy to sustain basic research and training of expertise across the full spectrum of the Earth sciences is motivated by these national imperatives. New Research Opportunities in the Earth Sciences identifies new and emerging research opportunities in the Earth sciences over the next decade, including surface and deep Earth processes and interdisciplinary research with fields such as ocean and atmospheric sciences, biology, engineering, computer science, and social and behavioral sciences. The report also identifies key instrumentation and facilities needed to support these new and emerging research opportunities. The report describes opportunities for increased cooperation in these new and emerging areas between EAR and other government agency programs, industry, and international programs, and suggests new ways that EAR can help train the next generation of Earth scientists, support young investigators, and increase the participation of underrepresented groups in the field.
Category: Science

Abolition

Author : Seymour Drescher
ISBN : 9781139482967
Genre : History
File Size : 44.98 MB
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In one form or another, slavery has existed throughout the world for millennia. It helped to change the world, and the world transformed the institution. In the 1450s, when Europeans from the small corner of the globe least enmeshed in the institution first interacted with peoples of other continents, they created, in the Americas, the most dynamic, productive, and exploitative system of coerced labor in human history. Three centuries later these same intercontinental actions produced a movement that successfully challenged the institution at the peak of its dynamism. Within another century a new surge of European expansion constructed Old World empires under the banner of antislavery. However, twentieth-century Europe itself was inundated by a new system of slavery, larger and more deadly than its earlier system of New World slavery. This book examines these dramatic expansions and contractions of the institution of slavery and the impact of violence, economics, and civil society in the ebb and flow of slavery and antislavery during the last five centuries.
Category: History

Confronting Consumption

Author : Thomas Princen
ISBN : 0262661284
Genre : Business & Economics
File Size : 78.38 MB
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Essays that offer ecological, social, and political perspectives on the problem of overconsumption.
Category: Business & Economics