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Bolted Joint Analyses For Composite Structures Current Empirical Methods And Future Scientific Prospects
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Book Synopsis Bolted Joint Analyses for Composite Structures -- Current Empirical Methods and Future Scientific Prospects by : LJ. Hart-Smith
Download or read book Bolted Joint Analyses for Composite Structures -- Current Empirical Methods and Future Scientific Prospects written by LJ. Hart-Smith and published by . This book was released on 2004 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: One purpose of this paper is to describe and explain some highlights in the history of the analysis and design of bolted or riveted joints in fiber-polymer composite laminates. The second is to project into the future, where it might become practical to replace today's empirical analytical tools, which need copious test data to enable them to be applied, with physics-based composite failure criteria of universal applicability that need very few intrinsic material properties. The paper focuses on the analysis tools and is not a compendium of available test data. The paper begins with a review of the governing geometric parameters, along with their influence on which failure mode will dominate. The concept of optimum joint geometries is introduced, to show how to maximize the gross-section laminate strength and, thereby, to minimize the weight of these structures. It progresses to the two widely used analysis tools, developed years ago at the Long Beach and St. Louis divisions of the former McDonnell Douglas Corporation. The Douglas model is applied via explicit formulae, in conjunction with an empirically established stress-concentration relief factor. The latest forms of these equations are presented here, having changed little since they were first proposed almost 30 years ago. The McDonnell model, identified by the code name BJSFM is also based on algebraic solutions, but is encoded to enable a more thorough assessment to be made of the entire stress field, rather than just the most critical two locations. This code also relies on empirically determined correlation factors, in the form of characteristic offset distances, sometimes mistakenly believed to be true material properties. These same factors can also be applied to modify the predictions of finite-element analyses. The importance of using simple comprehensible models is stressed. The former model can also be used with the non-linear multi-row computer code A4EJ, again with very little need of test data -- provided that the fiber pattern does not differ excessively from the quasi-isotropic lay-up. Excessively orthotropic fiber patterns are shown to be unacceptably weak at bolt holes and in need of a disproportionately large number of experimental test data to cover the many additional failure modes that cannot occur for close-to-isotropic fiber patterns. The paper closes with a glimpse of what the new SIFT (Strain-Invariant Failure Theory) for fiber-polymer composites, developed within the Boeing Company and already accepted for use at many locations outside, might do for this technology in terms of finite element analyses that need only five intrinsic material properties for each fiber-polymer combination, regardless of fiber pattern and joint geometry. The opportunities for drastic reductions in the cost of test programs, and accelerated schedules through not having to wait for specific tests for each joint, are clearly very powerful.
Book Synopsis Joining and Repair of Composite Structures by : K. T. Kedward
Download or read book Joining and Repair of Composite Structures written by K. T. Kedward and published by ASTM International. This book was released on 2004 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Composite Materials by : F. C. Campbell
Download or read book Structural Composite Materials written by F. C. Campbell and published by ASM International. This book was released on 2010-01-01 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with all aspects of advanced composite materials; what they are, where they are used, how they are made, their properties, how they are designed and analyzed, and how they perform in-service. It covers both continuous and discontinuous fiber composites fabricated from polymer, metal, and ceramic matrices, with an emphasis on continuous fiber polymer matrix composites.
Book Synopsis The Structural Integrity of Carbon Fiber Composites by : Peter W. R Beaumont
Download or read book The Structural Integrity of Carbon Fiber Composites written by Peter W. R Beaumont and published by Springer. This book was released on 2016-11-26 with total page 954 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together a diverse compilation of inter-disciplinary chapters on fundamental aspects of carbon fiber composite materials and multi-functional composite structures: including synthesis, characterization, and evaluation from the nano-structure to structure meters in length. The content and focus of contributions under the umbrella of structural integrity of composite materials embraces topics at the forefront of composite materials science and technology, the disciplines of mechanics, and development of a new predictive design methodology of the safe operation of engineering structures from cradle to grave. Multi-authored papers on multi-scale modelling of problems in material design and predicting the safe performance of engineering structure illustrate the inter-disciplinary nature of the subject. The book examines topics such as Stochastic micro-mechanics theory and application for advanced composite systems Construction of the evaluation process for structural integrity of material and structure Nano- and meso-mechanics modelling of structure evolution during the accumulation of damage Statistical meso-mechanics of composite materials Hierarchical analysis including "age-aware," high-fidelity simulation and virtual mechanical testing of composite structures right up to the point of failure. The volume is ideal for scientists, engineers, and students interested in carbon fiber composite materials, and other composite material systems.
Book Synopsis Dynamic Response and Failure of Composite Materials by : Valentina Lopresto
Download or read book Dynamic Response and Failure of Composite Materials written by Valentina Lopresto and published by Springer Nature. This book was released on 2023-04-24 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances and innovations in the field of dynamic loads and testing of composite materials and sandwich structures, as presented by international researchers and engineers at the International Symposium on Dynamic Response and Failure of Composite Materials (DRAF), held in Ischia, Italy, on June 21–24, 2022. Contributions include a wide range of topics such as low and high velocity impacts, smart composites, hull slamming, shock and blast, hail and bird impact, damage resistance and tolerance, failure mechanisms, composite structures, delamination and fractures, progressive damage modeling, micromechanics, ballistic impacts, ceramic and CMC, auxetic materials and structures, additive manufacturing, crashworthiness, green composites, and structural health monitoring.
Book Synopsis Commercial Aircraft Composite Technology by : Ulf Paul Breuer
Download or read book Commercial Aircraft Composite Technology written by Ulf Paul Breuer and published by Springer. This book was released on 2016-05-10 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is based on lectures held at the faculty of mechanical engineering at the Technical University of Kaiserslautern. The focus is on the central theme of societies overall aircraft requirements to specific material requirements and highlights the most important advantages and challenges of carbon fiber reinforced plastics (CFRP) compared to conventional materials. As it is fundamental to decide on the right material at the right place early on the main activities and milestones of the development and certification process and the systematic of defining clear requirements are discussed. The process of material qualification - verifying material requirements is explained in detail. All state-of-the-art composite manufacturing technologies are described, including changes and complemented by examples, and their improvement potential for future applications is discussed. Tangible case studies of high lift and wing structures emphasize the specific advantages and challenges of composite technology. Finally, latest R&D results are discussed, providing possible future solutions for key challenges such as low cost high performance materials, electrical function integration and morphing structures.
Book Synopsis Lightweight Materials by : Flake C. Campbell
Download or read book Lightweight Materials written by Flake C. Campbell and published by ASM International. This book was released on 2012-01-01 with total page 720 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Recent Studies on Bolted Joints in Composite Structures by : V. B. Venkayya
Download or read book Recent Studies on Bolted Joints in Composite Structures written by V. B. Venkayya and published by . This book was released on 1988 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief review of recent Air Force programs in bolted joints in composite structures was presented in this paper. The review included analytical methods development and experimental verification. Analytical methods addressed both single fastener and multifastener joints. A number of joint design variables, such as, finite geometry, fastener arrangement, joint service environment, and a number of relevant parameters were addressed in these programs. The test programs included static and fatigue specimens. Single fastener and multifastener joint tests were conducted to correlate the analysis results. Full scale test specimens were used to verify the overall analysis strategy. A comprehensive design guide was developed for the design and analysis of bolted joints in composite structures. This design guide is supported by four computer programs. (SDW).
Book Synopsis Design Methodology for Bonded-bolted Composite Joints by : Leonard John Hart-Smith
Download or read book Design Methodology for Bonded-bolted Composite Joints written by Leonard John Hart-Smith and published by . This book was released on 1982 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue and Fracture by : F. C. Campbell
Download or read book Fatigue and Fracture written by F. C. Campbell and published by ASM International. This book was released on 2012-01-01 with total page 699 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book emphasizes the physical and practical aspects of fatigue and fracture. It covers mechanical properties of materials, differences between ductile and brittle fractures, fracture mechanics, the basics of fatigue, structural joints, high temperature failures, wear, environmentally-induced failures, and steps in the failure analysis process."--publishers website.
Book Synopsis Composite Bolted Joints Analysis Programs by : BD. Snyder
Download or read book Composite Bolted Joints Analysis Programs written by BD. Snyder and published by . This book was released on 1990 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several different composite bolted joint analysis programs are now available to composite structures designers. All of the programs vary widely in the amount of input required, output received, and required user knowledge of composite materials. Six different bolted joint analysis programs will be examined. The various programs are (1) A4EJ, (2) BJSFM, (3) SASCJ, (4) SAMCJ, (5) SCAN, and (6) JOINT. Other analysis programs exist, but they apply many constraints on the problem definition and depend heavily on empirical test results. The relative merits of each program as well as their disadvantages will be discussed. The most appropriate applications of each of the programs will be presented, and some numerical comparisons of the results will be made. Each of the programs has a useful place in the design and analysis arena. An examination of the programs will be made to help users determine which program will best suit their needs.
Book Synopsis Recent Advances in Structural Joints and Repairs for Composite Materials by : Liyong Tong
Download or read book Recent Advances in Structural Joints and Repairs for Composite Materials written by Liyong Tong and published by Springer Science & Business Media. This book was released on 2013-03-09 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt: Joints in components or structures incur a weight penalty, are a source of failure, cause manufacturing problems, and are unfortunately unavoidable in most structures ranging from aircraft, and spacecraft to ships and offshore platforms, to automobiles, bridges and buildings. An important requirement for the complete design of practical structures is the development of attachment methods and joint designs. Recent Advances in Structural Joints and Repairs for Composite Materials provides an up-to-date account of adhesively bonded and mechanically fastened joints and repairs. Audience: This book will prove to be an informative resource for all engineers and researchers involved with joining and repair of composite structures.
Book Synopsis Bolted/bonded Joints in Polymeric Composites by :
Download or read book Bolted/bonded Joints in Polymeric Composites written by and published by . This book was released on 1997 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Analysis Method for Bolted Joints in Primary Composite Aircraft Structure by : Ingvar Eriksson
Download or read book An Analysis Method for Bolted Joints in Primary Composite Aircraft Structure written by Ingvar Eriksson and published by . This book was released on 1987 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis of bolted joints in composite structure requires, like structural analysis in general, methods for determining the stress distributions and relevant failure criteria. The stress analysis procedure discussed in this paper starts by addressing the joints as an integrated part of the overall structure. The stresses in the vicinity of the hole boundary are obtained through a series of finite element analyses, which starts with an overall load distribution analysis and ends with a 2-dimensional detailed contact stress analysis of the most highly stressed region in the joint. Strength is predicted for two basic failure modes occuring in a joint, net-tension and bearing failure. The failure hypotheses for these failure modes are described. Both the stress analysis and failure hypotheses are performed and established, respectively under certain idealizations. The conditions, in a real joint in an aircraft may differ from these idealizations. Hence, further work is required and is also proposed in this paper. The analysis procedure described in this paper is based on today's powerful computer facilities and offer great advantages compared with more empirical procedures. The procedure is presently used at Saab Aircraft Division. (SDW).
Book Synopsis Design Methodology for Bonded-Bolted Composite Joints. Volume I. Analysis Derivations and Illustrative Solutions by :
Download or read book Design Methodology for Bonded-Bolted Composite Joints. Volume I. Analysis Derivations and Illustrative Solutions written by and published by . This book was released on 1982 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains recent developments in three aspects of joints in advanced fibrous composite structures: (1) nonlinear analysis of adhesively- bonded stepped-lap joints and doublers, (2) multirow mechanically fastened joints in aerospace structures, and (3) nonlinear analysis of combined bonded and bolted joints. The methods developed include nonlinearities needed for metal structures as well as those for composites. The analysis are based on continuum mechanics techniques and have been coded into three Fortran IV digital computer programs A4EI, A4EJ, and A4EK respectively. The report contains explanations of the derivations of the solutions as well as sample worked problems to illustrate both the capabilities of the programs and the behavior characteristics of the real structures.
Book Synopsis Design Guide for Bolted Joints in Composite Structures by : R. L. Ramkumar
Download or read book Design Guide for Bolted Joints in Composite Structures written by R. L. Ramkumar and published by . This book was released on 1986 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: A design guide was developed for bolted composite structural joints. The guide includes general design guidelines for the various joint parameters, an analytical design methodology, a description of the analytical design tools, an illustration of the use of corresponding computer codes (SASCJ and SAMCJ), and a listing of the computer codes. The proposed design procedure is purely analytical, ad enables the user to rapidly evaluate many different joint concepts for a selected application. When the bolted structure is fabricated using existing (fully characterized) materials, the design requires no complementary test results. Presented analytical design tools are currently restricted to primarily uniaxially loaded joints and fastener arrangements that are currently used in aircraft structures. Also, the bolted joint is assumed to be strength-critical. However, sample fatigue test results are presented to illustrate a durability check on the joint, assuming a simplified fatigue analysis and assuming that fatigue is induced by excessive hole elongation. Despite its current restrictions, this guide is the first government document that provides guidance and analytical tools for the design of bolted composite structures. Keywords: Bolted joints, composite structures, design guidelines, analytical design tools, user instructions, samples, program listing.
Book Synopsis Design and Analysis of Bolted and Riveted Joints in Fibrous Composite Structures by : L.J.Hart- Smith
Download or read book Design and Analysis of Bolted and Riveted Joints in Fibrous Composite Structures written by L.J.Hart- Smith and published by . This book was released on 1984 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
