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Book An Investigation of the Thermal Conductance of Bolted Joints

Download or read book An Investigation of the Thermal Conductance of Bolted Joints written by Ian D. C. Andrew and published by . This book was released on 1964 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Investigation of the Thermal Conductance of Bolted Joints ByIan D C  Andrew

Download or read book An Investigation of the Thermal Conductance of Bolted Joints ByIan D C Andrew written by Andrew (Ian D.C.) and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Final Report on a Study of Thermal Conductance of Bolted Joints

Download or read book Final Report on a Study of Thermal Conductance of Bolted Joints written by C. A. Whitehurst and published by . This book was released on 1970 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Thermal Conductance of Bolted Joints

Download or read book The Thermal Conductance of Bolted Joints written by John Elton Fontenot and published by . This book was released on 1968 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Heat Transfer Between Surfaces in Contact   The Effect of Low Conductance Interstitial Materials  Parts 4 and 5   Investigation of Thermal Isolation Materials and Their Application in Bolted Flange Joints

Download or read book Heat Transfer Between Surfaces in Contact The Effect of Low Conductance Interstitial Materials Parts 4 and 5 Investigation of Thermal Isolation Materials and Their Application in Bolted Flange Joints written by and published by . This book was released on 1968 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book The Mechanics of Threaded Fasteners and Bolted Joints for Engineering and Design

Download or read book The Mechanics of Threaded Fasteners and Bolted Joints for Engineering and Design written by Toshimichi Fukuoka and published by Elsevier. This book was released on 2022-10-22 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mechanics of Threaded Fasteners and Bolted Joints outlines how threaded fasteners and bolted joints fail, how these failures can be remedied, and ultimately how to avoid them altogether through tightening methods, material strength, and avoiding loosening. The book demonstrates how to select the appropriate tightening method and determine the optimal tightening procedure for varying nominal diameters. Using the finite element method, it discusses characteristics of stress concentration and fatigue strength and covers bolt force variation due to elastic interaction. The separation of the plate interface via increased external force as the primary cause of fatigue failure in threaded fasteners is discussed, with effective countermeasures provided. Empirical equations of thermal contact coefficient and apparent thermal contact coefficient in simple form are included as well.?? - Outlines various tightening methods such as torque control, angle control, direct tension, and thermal expansion - Demonstrates methods for preventing fatigue failure - Discusses the effect of high and low temperature thermal loads on the strength of bolted joints by looking at thermal contact resistance at the interface

Book Thermal Contact Conductance

    Book Details:
  • Author : Chakravarti V. Madhusudana
  • Publisher : Springer Science & Business Media
  • Release : 2013-09-24
  • ISBN : 3319012762
  • Pages : 272 pages

Download or read book Thermal Contact Conductance written by Chakravarti V. Madhusudana and published by Springer Science & Business Media. This book was released on 2013-09-24 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work covers both theoretical and practical aspects of thermal contact conductance. The theoretical discussion focuses on heat transfer through spots, joints, and surfaces, as well as the role of interstitial materials (both planned and inadvertent). The practical discussion includes formulae and data that can be used in designing heat-transfer equipment for a variety of joints, including special geometries and configurations. All of the material has been updated to reflect the latest advances in the field.

Book High Temperature Bolted Joint with Thermal Distortion

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.

Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Book Experimental Investigation of the Thermal Contact Conductance of Metal polymer Joints

Download or read book Experimental Investigation of the Thermal Contact Conductance of Metal polymer Joints written by J. J. Fuller and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Thermo mechanical Analysis of Structural Joint Study

Download or read book Thermo mechanical Analysis of Structural Joint Study written by J. W.. Lobbett and published by . This book was released on 1962 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Thermal Contact Resistance in Bolted Joints

Download or read book Thermal Contact Resistance in Bolted Joints written by Joseph George Pigott and published by . This book was released on 1972 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Applied Mechanics Reviews

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1975 with total page 1000 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book WADC Technical Report

Download or read book WADC Technical Report written by United States. Wright Air Development Division and published by . This book was released on 1959 with total page 1318 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Spacecraft Thermal Control Handbook

Download or read book Spacecraft Thermal Control Handbook written by David G. Gilmore and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This is a revised and updated of (1994) and has been expanded to discuss interplanetary spacecraft as well as Earth- orbiting satellites. The work is presented as a compendium of corporate knowledge in the field of thermal control of uncrewed spacecraft and was written for thermal engineers of a range of experience levels. After discussing general issues and historical design approaches chapters examine current thermal control hardware, the thermal design and testing process, and emerging thermal technologies. Annotation c. Book News, Inc., Portland, OR (booknews.com).