Nondestructive Testing of Materials and Structures
Author: O. Büyüköztürk, M. Taşdemir, O. Güneş, Y. Akkaya Editors | Size: 43.55 MB | Format:PDF | Quality:Original preprint | Publisher: Springer | Year: 2013 | pages: 1130 | ISBN: 9789400707238
Condition assessment and characterization of materials and structures by means of nondestructive testing (NDT) methods is a priority need around the world to meet the challenges associated with the durability, maintenance, rehabilitation, retrofitting, renewal and health monitoring of new and existing infrastructures including historic monuments. Numerous NDT methods that make use of certain components of the electromagnetic and acoustic spectra are currently in use to this effect with various levels of success and there is an intensive worldwide research effort aimed at improving the existing methods and developing new ones. The knowledge and information compiled in this book captures the current state-of-the-art in NDT methods and their application to civil and other engineering materials and structures. Critical reviews and advanced interdisciplinary discussions by world-renowned researchers point to the capabilities and limitations of the currently used NDT methods and shed light on current and future research directions to overcome the challenges in their development and practical use. In this respect, the contents of this book will equally benefit practicing engineers and researchers who take part in characterization, assessment, evaluation and health monitoring of materials and structures.
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Article/eBook Full Name: ASTM E2126 - 11 Standard Test Methods for Cyclic (Reversed) Load Test for Shear Resistance of Vertical Elements of the Lateral Force Resisting Systems for Buildings
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PLASTIC buckling of plates and shells has been worked out by Bijlaard, Ilyushin, Stowell, Handelman and Prager, Gerard and others. Some investigators have assumed deformation type stress-strain laws while others have used incremental type (flow type) stress-strain laws. The present work is an extension of the work started by Gerard along the lines initiated by Stowell.
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Plastic buckling of cylindrical shells under biaxial loading
Author: J. J. Giezen, C. D. Babcock, J. Singer | Size: 758 KB | Format:PDF | Quality:Unspecified | Publisher: Springer | Year: 1991 | pages: 7
he predictions for plastic buckling of shells are significantly affected by the plasticity model employed, in particular in the case of nonproportional loading. A series of experiments on plastic buckling of cylindrical aluminum alloy shells under biaxial loading (external pressure and axial tension), with well-defined loading and boundary conditions, was therefore carried out to provide experimental data for evaluation of the suitability of different, plasticity models. In the experiments, initial imperfections and their growth under load were measured and special attention was paid to buckling detection and load path control. The Southwell plot was applied with success to smooth the results. The results show that axial tension decreases resistance to buckling under external pressure in the plastic region due to ‘softening’ of the material behavior. Comparison with numerical calculations usingJ 2 deformation and incremental theories indicate that both theories do not predict correctly plastic buckling under nonproportional loading.
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For elastic-plastic cylindrical shells with initial axisymmetric imperfections bifurcation into a non-axisymmetric shape is analysed. The shell material is represented by a phenomenological plasticity theory that accounts for the formation of a vertex on subsequent yield surfaces. The influence of various geometric and material parameters is investigated for a wide range of radius-to-thickness ratios. It is shown that for the thicker shells bifurcation generally occurs beyond the maximum axial compressive load. A few analyses for shells with additional non-axisymmetric imperfections show the unstable post-bifurcation behaviour and the sensitivity to imperfections of more general shapes.
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This paper focuses on the buckling of cylindrical shells with small thickness variations. Two important cases of thickness variation pattern are considered. Asymptotic formulas up to the second order of the thickness variation parameter ε are derived by the combination of the perturbation and weighted residual methods. The expressions obtained in this study reduce to Koiter's formulas, when only the first-order term of the thickness variation parameter is retained in the analysis. Results from the asymptotic formulas are compared with those obtained through the purely numerical techniques of the finite difference method and the shooting method.
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Article/eBook Full Name: Nonlinear Buckling Behaviour of Imperfect Cylindrical Shells under Global Bending in the Elastic-Plastic Range
Author(s): Lei Chen
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The most powerful aspects of myths are their ability to incite wonder and excitement. We're creating a myth that does these things while also challenging audiences to think.
The myth is that located in Rochester, NY, is the Escherian Stairwell, an architectural marvel that seems to violate the laws of physics and basic logic by looping back into itself. In order to lend credence to this myth, we're creating an episode for a family-friendly science show that demonstrates the staircase in action, various clips from a 1997 documentary with prominent thinkers grappling with the existence of this apparent contradiction and pontificating on its implications, and a whole slew of supplemental online materials for today's internet savvy audience to stumble across while trying to see if this thing is real (websites, scholarly articles, fan-pages, blogs, etc.). Help us build the myth!
Why create a myth?
Well, the short answer is that myths are awesome. Especially when done right. The slightly longer answer is that we are passionate about immersing audiences with a sense of wonder and surrounding them with a wealth of detail executed with such rigorous realism that they can choose to step into it, get lost in it, and believe in it. Films like Close Encounters and 2001 inspired us with awe, and even a hint of fear, when we first saw them. How do we capture that feeling again? The internet and the age of social media seem to be opening up doors to reinvent the medium and reignite those in-theater experiences that have gotten stale over the decades.
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REQUEST: Foundation Vibration Analysis Using Simple Physical Models
Author: John P. Wolf | Size: ?? MB | Format:PDF | Quality:Unspecified | Publisher: Prentice Hall | Year: May 21, 1994 | pages: 464 | ISBN: 0130107115, 9780130107114
This book provides simple physical models to represent the unbounded soil in time and frequency domain analysis. They do not supplant the more generally applicable rigorous methods, but rather supplement them. The physical models used consists of the following representations: cones based one-dimensional rod theory; lumped-parameter models with frequency-independent springs, dashpots, and masses; and prescribed wave patterns in the horizontal plane. The physical models thus offer a strength-of-materials approach to foundation dynamics.
From the Publisher
Offering a strength-of-materials approach to foundation dynamics, this volume shows how to use such simple physical models (cones, lumped-parameter models, and prescribed wave patterns in the horizontal plane) for analysis of foundation vibration problems that result from earthquakes, machine foundation, explosions, winds, and ocean waves on offshore platforms.
From the Back Cover
The rigorous methods used to model unbounded soil in large, complex projects are often not really appropriate for use in smaller, less critical projects. However, simple physical models are useful for the vast majority of foundation projects and they easily fit the budget and available time and require no sophisticated computer code. Offering a strength-of-materials approach to foundation dynamics, this volume shows how to use such simple physical models (cones, lumped-parameter models, and prescribed wave patterns in the horizontal plane) for analysis of foundation vibration problems that result from earthquakes, machine foundation, explosions, winds, and ocean waves on offshore platforms. Considers foundation on surface of homogeneous soil halfspace; foundation on surface of soil layer on rigid rock; embedded foundation and pile foundation; simple vertical dynamic-Green's function; seismic excitation; and dynamic soil-structure interaction. Features easy-to-use tables and detailed case studies. For geotechnical engineers, structural engineers, and engineering mechanics specialists.
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