Download or read book Majorana Demonstrator Bolted Joint Mechanical and Thermal Analysis written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Temperature Bolted Joint with Thermal Distortion written by and published by . This book was released on 2020 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bolt mechanics has been developed over thousands of years. Today, bolted joints researchers and designers are still facing challenges in many areas especially when a joint works at elevated temperatures. Temperature changes of a bolted joint in such systems induce catastrophic cyclic axial and bending strain to the fasteners and gasket degradation. Now, with many studies, the axial strain issue can be addressed by adjusting the clamping load to maintain the stiffness of the joint or by changing the jointed materials to have appropriate coefficient of thermal expansions (CTE) to have a suitable clamping load. Dealing with the bending strain caused by cyclic thermal changes, however, is more complicated. It is still a big challenge for engine designers and fastener researchers. During heat up and cool down, most bolted joints have dissimilar thermal expansion rate of jointed components or different temperature profiles which will cause bolted joint expansion or contraction motions in axial and transverse directions. The amplitude of the bolt transverse motion is called bending motion in this dissertation which is associated with the relative motions between jointed components and bolt head. Friction force acting on the bolt head bearing area causes the bolt bending motion resulting in bolt bending fatigue. In this research, mathematical modeling and FEA methods have been employed to specify the design space based on the high temperature bolted joint operating conditions. The design target can be defined based on design control factors including demission, materials and operating temperature of the bolted joint. With this developed method, a specific high temperature bolted joint has been designed with a frictional target of the bolted joint. To meet this target, a series of tribological bench tests were conducted to evaluate washer with different coatings which have potential good high temperature characteristics under different temperatures. A washer with CrN46 multi-layer coating was found to close to the design target which was effective under high pressure and high temperature with a relatively low coefficient of friction. The tested coating has been analyzed after test and found that, with the aid of the formation of W2C, tungsten could allow the DLC coating to perform well under high temperature environment. This verified J. Luthin and C. Linsmeier finding that the W2C formation starts at 500°C. Delamination is the main wear mechanism for the CrN46 coating, but the wear depth met the design requirement which was 1500 reciprocating cycles. A sensitivity study using Taguchi method was conducted and showed that the dry coefficient of friction depends on many factors, including temperature, materials, surface finishing and sliding speed. The material is the most significant design control factor, which affects the friction coefficient. The CrN46 coasting sliding against CrN46 coasting was found to provide even lower coefficient of friction which was used in the design. Then the design of the joint with the coated washer was validated by engine dyno data which was collected by a novel mutli-camera 3D-DIC system developed in this research. This might be the first time 3D-DIC system has been successfully applied in an engine dyno to measure the displacement of the exhaust manifold and fasteners exposed to high temperatures, mechanical and dynamic loads. This application illustrated that a 3D-DIC system could be applied in a severe thermal and vibration environment with a proper system design. The data collected by the 3D-DIC system was compared to traditional LVDT data. It showed that 3D-DIC was reliable and could provide whole field contour data. The measured data has been used to validate the CAE analysis and improve the computational methodology. Measuring the strain field was still a challenge for this 3D-DIC system because of the high thermal strain generated at high temperature. A high-resolution speckle pattern was needed as well. To systematically address the high temperature bolt joint with thermal deformation, a robust CAE method for the MLS gasket design has been developed to overcome the current design method which was not an effective method to evaluate MLS gasket sealing performance with consideration of gasket material thermal degradation. A new method was developed in this research. In the new method, a thermal degradation factor was used to correct the gasket sealing pressure calculated by the current CAE method. With the new method, it was found that a gasket with high thermal degradation resistance showed better sealing performance than a gasket with low thermal degradation resistance, while the current CAE method could not have predicted any difference. The results from the new method matched with the dyno real engine test observation very well and can be used for high temperature bolted joint designs. Overall, this research found a metrology to predefine a friction requirement and a robust "engineed refiles"/"engineered coated washer" to provide a robust hig temperature bolted joint design. Four main sections were focused on in this research. The first was developing a systematic method which combined virtual analyses with bench tests to develop a low friction coated washer to solve the bolt bending fatigue issue due to the engine cyclic thermal changes. The second was to design tests to validate the performance of the low friction coated washer to meet the predefined frictional requirements. The third was to improve a process for virtual analysis for the high temperature bolted joint with more accurate temperature simulation and frictional interface model. The fourth was to develop a method to predict the gasket sealing behavior at the elevated temperature when considering the creep and relaxation of the bolted joint. The objective of this research has been met by the complete of the below tasks. 1. Developed a systematic method for designing a high temperature bolted joint for bolt bending fatigue. 2. A coating has been developed and evaluated by a series of A bench tests to solve the bolt bending fatigue issue due to the engine cyclic thermal changes. 3. A unique multi-camera 3D-DIC system has been successfully designed and applied in an engine dyno to measure the displacement of the exhaust manifold and fasteners exposed to high temperatures, mechanical and dynamic loads. 4. Virtual analysis method for the high temperature bolted joint has been improved with more accurate temperature simulation and frictional interface model. 5. Developed a method to predict the gasket sealing behavior at the elevated temperature with consideration of the creep and relaxation of the bolted joint. 6. Design and method have been validated by engine dyno tests.

Download or read book Stress Analysis for Thermal Contact Resistance Across Bolted Joints written by Terry Lee Bradley and published by . This book was released on 1968 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to the Design and Behavior of Bolted Joints Third Edition Revised and Expanded written by John Bickford and published by CRC Press. This book was released on 1995-07-19 with total page 998 pages. Available in PDF, EPUB and Kindle. Book excerpt: Offering a broad-based review of the factors affecting the design, assembly and behaviour of bolted joints and their components in all industries, this work details various assembly options as well as specific failure modes and strategies for their avoidance. This edition features material on: the contact stresses between bolt head or nut face and the joint; thread forms, series and classes; the stiffness of raised face flange joints; and more.

Download or read book Analysis of Bolted Joints written by and published by . This book was released on 2000 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book An Introduction to the Design and Behavior of Bolted Joints written by John H. Bickford and published by . This book was released on 1981 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Mechanical and Thermal Stresses in Adhesive and Bolted Joints written by R.H.B. Fey and published by . This book was released on 2000 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to the Design and Behavior of Bolted Joints written by John H. Bickford and published by . This book was released on 2008 with total page 515 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Essential Oils written by K. Husnu Can Baser and published by CRC Press. This book was released on 2009-12-28 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: Egyptian hieroglyphs, Chinese scrolls, and Ayurvedic literature record physicians administering aromatic oils to their patients. Today society looks to science to document health choices and the oils do not disappoint. The growing body of evidence of their efficacy for more than just scenting a room underscores the need for production standards, quality control parameters for raw materials and finished products, and well-defined Good Manufacturing Practices. Edited by two renowned experts, the Handbook of Essential Oils covers all aspects of essential oils from chemistry, pharmacology, and biological activity, to production and trade, to uses and regulation. Bringing together significant research and market profiles, this comprehensive handbook provides a much-needed compilation of information related to the development, use, and marketing of essential oils, including their chemistry and biochemistry. A select group of authoritative experts explores the historical, biological, regulatory, and microbial aspects. This reference also covers sources, production, analysis, storage, and transport of oils as well as aromatherapy, pharmacology, toxicology, and metabolism. It includes discussions of biological activity testing, results of antimicrobial and antioxidant tests, and penetration-enhancing activities useful in drug delivery. New information on essential oils may lead to an increased understanding of their multidimensional uses and better, more ecologically friendly production methods. Reflecting the immense developments in scientific knowledge available on essential oils, this book brings multidisciplinary coverage of essential oils into one all-inclusive resource.

Download or read book Cryostat Design written by J.G. Weisend II and published by Springer. This book was released on 2016-08-12 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book enables the reader to learn the fundamental and applied aspects of practical cryostat design by examining previous design choices and resulting cryostat performance. Through a series of extended case studies the book presents an overview of existing cryostat design covering a wide range of cryostat types and applications, including the magnet cryostats that comprise the majority of the Large Hadron Collider at CERN, space-borne cryostats containing sensors operating below 1 K, and large cryogenic liquid storage vessels. It starts with an introductory section on the principles of cryostat design including practical data and equations. This section is followed by a series of case studies on existing cryostats, describing the specific requirements of the cryostat, the challenges involved and the design choices made along with the resulting performance of the cryostat. The cryostat examples used in the studies are chosen to cover a broad range of cryostat applications and the authors of each case are leading experts in the field, most of whom participated in the design of the cryostats being described. The concluding chapter offers an overview of lessons learned and summarises some key hints and tips for practical cryostat design. The book will help the reader to expand their knowledge of many disciplines required for good cryostat design, including the cryogenic properties of materials, heat transfer and thermal insulation, instrumentation, safety, structures and seals.

Download or read book Modern Physics written by Paul Allen Tipler and published by Worth Pub. This book was released on 1978 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the intermediate-level course, the Fifth Edition of this widely used text takes modern physics textbooks to a higher level. With a flexible approach to accommodate the various ways of teaching the course (both one- and two-term tracks are easily covered), the authors recognize the audience and its need for updated coverage, mathematical rigor, and features to build and support student understanding. Continued are the superb explanatory style, the up-to-date topical coverage, and the Web enhancements that gained earlier editions worldwide recognition. Enhancements include a streamlined approach to nuclear physics, thoroughly revised and updated coverage on particle physics and astrophysics, and a review of the essential Classical Concepts important to students studying Modern Physics.

Download or read book Eurocode 1 Actions on structures Part 4 Silos and tanks written by and published by . This book was released on 2006 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media written by Jacques P. Huyghe and published by Springer Science & Business Media. This book was released on 2005-10-18 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last decades, new experimental and numerical techniques have taken many advanced features of porous media mechanics down to practical engineering applications. This happened in areas that sometimes were not even suspected to be open to engineering ideas at all. The challenge that often faces engineers in the field of geomechanics, biomechanics, rheology and materials science is the translation of ideas existing in one field to solutions in the other. The purpose of the IUTAM symposium from which this proceedings volume has been compiled was to dive deep into the mechanics of those porous media that involve mechanics and chemistry, mechanics and electromagnetism, mechanics and thermal fluctuations of mechanics and biology. The different sections have purposely not been formed according to field interest, but on the basis of the physics involved.

Download or read book Two Dimensional Transition Metal Dichalcogenides written by Alexander V. Kolobov and published by Springer. This book was released on 2016-07-26 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarizes the current status of theoretical and experimental progress in 2 dimensional graphene-like monolayers and few-layers of transition metal dichalcogenides (TMDCs). Semiconducting monolayer TMDCs, due to the presence of a direct gap, significantly extend the potential of low-dimensional nanomaterials for applications in nanoelectronics and nano-optoelectronics as well as flexible nano-electronics with unprecedented possibilities to control the gap by external stimuli. Strong quantum confinement results in extremely high exciton binding energies which forms an interesting platform for both fundamental studies and device applications. Breaking of spatial inversion symmetry in monolayers results in strong spin-valley coupling potentially leading to their use in valleytronics. Starting with the basic chemistry of transition metals, the reader is introduced to the rich field of transition metal dichalcogenides. After a chapter on three dimensional crystals and a description of top-down and bottom-up fabrication methods of few-layer and single layer structures, the fascinating world of two-dimensional TMDCs structures is presented with their unique atomic, electronic, and magnetic properties. The book covers in detail particular features associated with decreased dimensionality such as stability and phase-transitions in monolayers, the appearance of a direct gap, large binding energy of 2D excitons and trions and their dynamics, Raman scattering associated with decreased dimensionality, extraordinarily strong light-matter interaction, layer-dependent photoluminescence properties, new physics associated with the destruction of the spatial inversion symmetry of the bulk phase, spin-orbit and spin-valley couplings. The book concludes with chapters on engineered heterostructures and device applications such as a monolayer MoS2 transistor. Considering the explosive interest in physics and applications of two-dimensional materials, this book is a valuable source of information for material scientists and engineers working in the field as well as for the graduate students majoring in materials science.

Download or read book Introduction to Elementary Particles written by David Jeffery Griffiths and published by HarperCollins Publishers. This book was released on 1987-01-01 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Basics of Foundation Design written by Bengt Fellenius and published by Lulu.com. This book was released on 2017-03-17 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: The "Red Book" presents a background to conventional foundation analysis and design. The text is not intended to replace the much more comprehensive 'standard' textbooks, but rather to support and augment these in a few important areas, supplying methods applicable to practical cases handled daily by practising engineers and providing the basic soil mechanics background to those methods. It concentrates on the static design for stationary foundation conditions. Although the topic is far from exhaustively treated, it does intend to present most of the basic material needed for a practising engineer involved in routine geotechnical design, as well as provide the tools for an engineering student to approach and solve common geotechnical design problems.

Download or read book The Strange Story of the Quantum written by Banesh Hoffmann and published by Courier Corporation. This book was released on 1959-01-01 with total page 305 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timeless exploration of the work of the great physicists of the early 20th century employs analogies, examples, and imaginative insights rather than computations to explain the dramatic impact of quantum physics on classical theory. Topics include Pauli's exclusion principle, Schroedinger's wave equation, Heisenberg's uncertainty principle, and many other concepts. 1959 edition.