I hate to say this, but I have gotten 2 warnings back to back few weeks ago.
It is without saying that the warnings I've received were due to violation of one rule.
At the first time I received, I thought I violated other rule than the one that I did, so I repeated my mistake.
Hence, my suggestion is, when you describe which rule a user violate, use the rule number instead of description. Then, refer to the rule page. Personally, I think it's more logical to direct to the rule page instead of describing what user did wrong.
Author: Several | Size: 3.63 MB | Format:PDF | Quality:Original Preprint | Publisher: Kansas Department of Transportation | Year: Nov, 2011 | pages: 70 | ISBN: none
Soil nail walls are a widely used technology for retaining vertical and nearly vertical cuts in soil. A significant portion of the cost of soil nail wall construction is related to the construction of a reinforced concrete face. The potential for use of a flexible facing design for soil nail walls to replace reinforced concrete facing was evaluated using three-dimensional finite difference modeling and physical testing of a 1.5 meter by 1.5 meter unit cell of a soil nail wall in clay. A steel mesh form of flexible facing was used as a substitute for concrete. The finite difference model predicted large vertical and horizontal deformations for surcharges of approximately 5 psi. In the physical testing, the flexible facing products performed well with regard to strength, but the facing experienced large vertical and horizontal deformations that were consistent with the numerical modeling. Based on these results, it is recommended that use of flexible facing as a substitute for reinforced concrete be limited to non-critical structures where large vertical and horizontal deformations are acceptable.
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Folder Guard® is a powerful computer security program that you can use to control access to files, folders, and other Windows resources, such as Control Panel, Start Menu, and so on. You can use Folder Guard to lock your personal files and folders with passwords, to stop other users from peeking into your records. You can even completely hide your private folders from virtually all applications, and such folders would remain invisible until you enter a valid password. You can also protect sensitive system files from modification or destruction, disable access to the removable drives, restrict access to Control Panel, and more.
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Equivalent Beam Method for Trusses,
Practice Periodical on Structural Design and Construction
Giltner, B. and Kassimali, A. (2000). ”Equivalent Beam Method for Trusses.” Pract. Period. Struct. Des. Constr., 5(2), 70–77.
Elasticity, plasticity, damage mechanics and cracking are all phenomena that determine the resistance of solids to deformation and fracture. The authors of this book discuss a modern method of mathematically modeling the behavior of macroscopic volume elements. The first three chapters review physical mechanisms at the microstructural level, thermodynamics of irreversible processes, mechanics of continuous media, and the classification of the behavior of solids. The rest of the book is devoted to the modeling of different types of material behavior. In each case the authors present characteristic data for numerous materials, and discuss the physics underlying the phenomena together with methods for the numerical analysis of the resulting equations
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This text is intended for the study of fluid mechanics at an intermediate level. The presentation starts with basic concepts, in order to form a sound conceptual structure that can support engineering applications and encourage further learning. The presentation is exact, incorporating both the mathematics involved and the physics needed to understand the various phenomena in fluid mechanics. Where a didactical choice must be made between the two, the physics prevails. Throughout the book the authors have tried to reach a balance between exact presentation, intuitive grasp of new ideas, and creative applications of concepts. This approach is reflected in the examples presented in the text and in the exercises given at the end of each chapter. Subjects treated are hydrostatics, viscous flow, similitude and order of magnitude, creeping flow, potential flow, boundary layer flow, turbulent flow, compressible flow, and non-Newtonian flows. This book is ideal for advanced undergraduate students in mechanical, chemical, aerospace, and civil engineering. Solutions manual available The Field of Fluid Mechanics -- The Continuum -- Local Properties in a Continuum -- Body and Surface Forces -- Stress at a Point -- Definition of a Fluid -- Units and Dimensions -- Dimensional Homogeneity -- Fluid Properties -- Stress in a Fluid -- The Momentum Equations -- Index Notation -- Moments on a Cube -- Forces at a Point on a Plane -- The Elementary Tetrahedron -- Stress in a Fluid at Rest -- Stress in a Moving Fluid -- A Case where the Stress Is Not Constant -- The Stress Tensor -- Transformation of Coordinates--Vectors -- Transformation of Coordinates--Tensors -- Principal Directions -- Identical Principal Stresses--Pascal's Law -- Fluid Statics -- The Equation of Hydrostatics -- Manometers -- Equation of Hydrostatics in Accelerating Frames of Reference -- Forces Acting on Submerged Surfaces -- Force on a Submerged Plane Surface -- Forces on Submerged Surfaces--The General Case -- Hydrostatic Stability -- Fluids in Motion--Integral Analysis -- Thermodynamic Systems and Control Volumes -- Reynolds Transport Theorem -- Control Volume Analysis of Conservation of Mass -- Conservation of Mass under Steady State Conditions -- The Momentum Theorem for a Control Volume -- Other Forces on the Control Volume -- Angular Momentum Theorem for a Control Volume -- Correction Factor for Average Velocity in Momentum Theorem -- Fluids in Motion--Differential Analysis -- Differential Representation -- Streamlines, Stream Sheets and Stream Tubes -- The Material Derivative -- Conservation of Mass--The Equation of Continuity
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This text provides a thorough treatment of the fundamental principles of fluid mechanics and convection heat transfer and shows how to apply the principles to a wide variety of fluid flow problems. The focus is on incompressible viscous flows with special applications to non-Newtonian fluid flows, turbulent flows, and free-forced convection flows. A special feature of the text is its coverage of generalized mass, momentum, and heat transfer equations, Cartesian tensor manipulations, scale analyses, mathematical modeling techniques, and practical solution methods. The final chapter is unique in its case-study approach, applying general modeling principles to analyze nonisothermal flow systems found in a wide range of engineering disciplines. The author provides numerous end-of-chapter problems, solutions, and mathematical aids to enhance the reader's understanding and problem-solving skills
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Introduction to Elasticity Theory for Crystal Defects
Author: R W Balluffi | Size: 3.89 MB | Format:PDF | Quality:Unspecified | Publisher: Cambridge University Press | Year: 2012 | pages: 458 | ISBN: 9781107012554
Self-sufficient and user-friendly, this book provides a complete introduction to the anisotropic elasticity theory necessary to model a wide range of crystal defects. Assuming little prior knowledge of the subject, the reader is first walked through the required basic mathematical techniques and methods. This is followed by treatments of point, line, planar and volume type defects such as vacancies, dislocations, grain boundaries, inhomogeneities and inclusions. Included are analyses of their elastic fields, interactions with imposed stresses and image stresses, and interactions with other defects, all employing the basic methods introduced earlier. This step by step approach, aided by numerous exercises with solutions provided, strengthens the reader's understanding of the principles involved, extending it well beyond the immediate scope of the book. As the first comprehensive review of anisotropic elasticity theory for crystal defects, this text is ideal for both graduate students and professional researchers ''Self-sufficient and user-friendly, this book provides a complete introduction to the anisotropic elasticity theory necessary to model a wide range of crystal defects. Assuming little prior knowledge of the subject, the reader is first walked through the required basic mathematical techniques and methods. This is followed by treatments of point, line, planar and volume type defects such as vacancies, dislocations, grain boundaries, inhomogeneities and inclusions. Included are analyses of their elastic fields, interactions with imposed stresses and image stresses, and interactions with other defects, all employing the basic methods introduced earlier. This step by step approach, aided by numerous exercises with solutions provided, strengthens the reader's understanding of the principles involved, extending it well beyond the immediate scope of the book. As the first comprehensive review of anisotropic elasticity theory for crystal defects, this text is ideal for both graduate students and professional researchers''-- Read more... 1. Introduction -- 2. Basic elements of linear elasticity -- 3. Methods -- 4. Green's functions for unit point force -- 5. Interactions between defects and stress -- 6. Inclusions in infinite homogeneous regions -- 7. Interactions between inclusions and imposed stress -- 8. Inclusions in finite regions-- image effects -- 9. Inhomogeneities -- 10. Point defects in infinite homogeneous regions -- 11. Point defects and stress-- image effects in finite bodies -- 12. Dislocations in infinite homogeneous regions -- 13. Dislocations and stress-- image effects in finite regions -- 14. Interfaces -- 15. Interactions between interfaces and stress -- 16. Interactions between defects -- Appendices
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Author: William F Hosford | Size: 18 MB | Format:PDF | Quality:Unspecified | Publisher: Cambridge University Press | Year: 2008 | pages: 298 | ISBN: 9780521899970
This title is intended for a first undergraduate course in materials science and engineering with an emphasis on mechanical and electrical properties. The text features numerous useful examples and exercises. It differs from some available texts in that it covers the materials of greatest interest in most undergraduate programs, leaving more specialized and advanced coverage for later course books. This volume begins with phases and phase diagrams. This is followed by a chapter on diffusion, which treats diffusion in multiphase systems as well as single phase systems. The next several chapters on mechanical behavior and failure should be of particular interest to mechanical engineers. There are chapters on iron and steel and on nonferrous alloys followed by chapters on specific types of materials. There is an emphasis on manufacturing, including recycling, casting and welding, powder processing, solid forming, and more modern techniques including photolithography, vapor deposition and the use of lasers Phases -- Diffusion -- Mechanical behavior -- Mechanical failure -- Annealing -- Iron and steel -- Nonferrous metals -- Casting and welding -- Solid shaping -- Polymers -- Polymer processing -- Glasses -- Crystalline ceramics -- Powder processing -- Pottery and concrete
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This revised and updated second edition of a highly successful book provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, nonmetals and composites. The author, a leading researcher in the field, discusses the principles of cyclic deformation, crack initiation and crack growth by fatigue, covering both microscopic and continuum aspects. The book begins with discussions of cyclic deformation and fatigue crack initiation in monocrystalline and polycrystalline ductile alloys as well as in brittle and semi-/non-crystalline solids. Total life and damage-tolerant approaches are then introduced in metals, nonmetals and composites. This will be an important reference for anyone studying fracture and fatigue in materials science and engineering, mechanical, civil, nuclear and aerospace engineering, and biomechanics Preface; 1. Introduction and overview; Part I. Cyclic Deformation and Fatigue Crack Initiation: 2. Cyclic deformation in ductile single crystals; 3. Cyclic deformation in polycrystalline ductile solids; 4. Fatigue crack initiation in ductile solids; 5. Cyclic deformation and crack initiation in brittle solids; 6. Cyclic deformation and crack initiation in noncrystalline solids; Part II. Total-Life Approaches: 7. Stress-life approach; 8. Strain-life approach; Part III. Damage-Tolerant Approach: 9. Fracture mechanics and its implications for fatigue; 10. Fatigue crack growth in ductile solids; 11. Fatigue crack growth in brittle solids; 12. Fatigue crack growth in noncrystalline solids; Part IV. Advanced Topics: 13. Contact fatigue: sliding, rolling and fretting; 14. Retardation and transients in fatigue crack growth; 15. Small fatigue cracks; 16. Environmental interactions: corrosion-fatigue and creep-fatigue; Appendix; References; Indexes
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