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Author : Ralph Kussmaul
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (112 download)
Download or read book Design and Optimization of Variable Stiffness Composite Structures from Patched Laminates written by Ralph Kussmaul and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Zafer Gürdal
Publisher : John Wiley & Sons
ISBN 13 : 9780471252764
Total Pages : 358 pages
Book Rating : 4.2/5 (527 download)
Download or read book Design and Optimization of Laminated Composite Materials written by Zafer Gürdal and published by John Wiley & Sons. This book was released on 1999-01-28 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Kompositwerkstoffe wurden traditionell in der Raumfahrt verwendet, weil Gewicht dort ein wichtiger Faktor ist. Mittlerweile hat man diese Werkstoffe auch im Bereich des Maschinenbaus eingesetzt. Dies ist das erste Buch, das Mechanik und Optimierungstechniken für Kompositwerkstoffe aufbereitet. Beigefügt ist eine Diskette mit Anwendungen und Lernprogrammen. (02/99)
Author : P. Pedersen
Publisher : Elsevier
ISBN 13 : 0444600302
Total Pages : 528 pages
Book Rating : 4.4/5 (446 download)
Download or read book Optimal Design with Advanced Materials written by P. Pedersen and published by Elsevier. This book was released on 2012-12-02 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimal design with advanced materials is becoming a very progressive and challenging domain within applied mechanics. The increasing use of advanced materials, such as anisotropic fiber composites and ceramics, is instigating new developments to be made within constitutive modelling and the computational methods of analysis, sensitivity analysis and optimization. A new dimension of optimal design is being realised by the direct tailoring and building of new materials. Research in this area is accelerating rapidly with the results already being applied to high technology industries. Two vital high technology research areas covered in this volume include homogenization and smart materials/structures. The 31 papers will prove an indispensable reference source for all those involved in the interdisciplinary research and development aspects of mechanics, materials and mathematics in the design of advanced materials.
Author : Mahdi Arian Nik
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (911 download)
Download or read book Surrogate-based Multi-objective Optimization of Variable Stiffness Composites with Embedded Defects Induced by Automated Fiber Placement written by Mahdi Arian Nik and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "In composite materials, a variable stiffness design, where the fibers are allowed to follow curvilinear paths, gives freedom to tailor the properties in directions that are more favorable for carrying loads within the laminate. As a result, it yields improved structural performance and provides flexibility for a trade-off between structural properties. A variable stiffness composite laminate can be manufactured using Automated Fiber Placement (AFP) technology. Due to the characteristics of the manufacturing process by AFP, certain defects in the form of gaps and/or overlaps emerge within the composite laminate. The present thesis describes an efficient tool developed to design and optimize variable stiffness laminates with embedded defects manufactured by AFP.First, simultaneous maximization of the buckling load and in-plane stiffness is investigated for a variable stiffness laminate, where semi-analytical analysis is used to evaluate the structural properties. The results show that the use of a curvilinear fiber path allows the simultaneous improvement of both buckling load and in-plane stiffness of a variable stiffness laminate compared to a quasi-isotropic laminate. It is found that the optimum direction of varying the fiber angle depends on the loading and boundary conditions. For a plate with free transverse edges, the optimum direction is perpendicular to the loading direction, while for fixed transverse edges it is along the loading direction. It is demonstrated that the minimum turning radius constraint imposed by AFP significantly reduces the maximum achievable improvement in the buckling load of a variable stiffness laminate. Second, a novel method, namely Defect Layer Method, is proposed to capture the location and geometry of defects and build the finite element model of a variable stiffness laminate with embedded defects. The method is then used in a parametric study to evaluate the impact of design and manufacturing parameters on the amount of defects within the laminate. The results show that using a one-sided tow drop strategy results in a significant lower amount of gaps and overlaps within the laminate compared to a both-sided tow drop strategy. It is demonstrated that using the largest number of tows with the smallest tow width yields the minimum gap and overlap area percentages within a variable stiffness laminate.Third, a surrogate-based optimization algorithm is proposed to alleviate the high computational cost of the optimization of a variable stiffness laminate. To select an appropriate metamodel, the performance of alternative metamodeling methods is compared using multiple criteria. A metamodel performance is assessed in terms of its accuracy and robustness in constructing an approximation of the buckling load and in-plane stiffness, and its suitability for integration into an optimization framework. It is found that in terms of accuracy, both Kriging (KRG) and Radial Basis Function (RBF) provide the best results, where in terms of robustness KRG has been slightly better than RBF. In terms of suitability, KRG has shown the best performance for problems with a low number of design variables, whereas RBF has been the most appropriate method for a high number of variables.Finally, the surrogate-based multi-objective optimization is used to simultaneously maximize the buckling load and in-plane stiffness of a variable stiffness laminate with embedded defects. The results show that if the effect of defects is factored in the optimization problem, for a complete gap strategy the defect-free Pareto front shifts towards lower in-plane stiffness and buckling load, whereas for a complete overlap strategy the defect-free Pareto front moves towards higher structural properties. The difference between gap and overlap modified Pareto fronts is largest for laminates that provides the maximum buckling load improvement and decreases as the layup becomes closer to the case of maximum in-plane stiffness." --
Author : Carlos A. Mota Soares
Publisher : Springer Science & Business Media
ISBN 13 : 9401144893
Total Pages : 524 pages
Book Rating : 4.4/5 (11 download)
Download or read book Mechanics of Composite Materials and Structures written by Carlos A. Mota Soares and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compact presentation of the foundations, current state of the art, recent developments and research directions of all essential techniques related to the mechanics of composite materials and structures. Special emphasis is placed on classic and recently developed theories of composite laminated beams, plates and shells, micromechanics, impact and damage analysis, mechanics of textile structural composites, high strain rate testing and non-destructive testing of composite materials and structures. Topics of growing importance are addressed, such as: numerical methods and optimisation, identification and damage monitoring. The latest results are presented on the art of modelling smart composites, optimal design with advanced materials, and industrial applications. Each section of the book is written by internationally recognised experts who have dedicated most of their research work to a particular field. Readership: Postgraduate students, researchers and engineers in the field of composites. Undergraduate students will benefit from the treatment of the foundations of the mechanics of composite materials and structures.
Author :
Publisher :
ISBN 13 :
Total Pages : 128 pages
Book Rating : 4.:/5 (856 download)
Download or read book Optimization of Variable Stiffness Composite Plate Structures written by and published by . This book was released on 2013 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the last several decades, the trend in material choice for aerospace structures has shifted increasingly in favor of composite materials such as graphite fiber impregnated with epoxy resin. With the price of jet fuel more than doubling just in the last ten years, the trend towards composite materials is accelerating. Traditional composite structures are fabricated by stacking layers of woven fibers that are oriented in the same direction. Human operators perform the work. However, there now exist machines that can be programmed to place composite fibers in continuous paths that can vary in orientation. The present work investigates a method for determining the optimal ply angle distributions for such laminates which are also known as variable stiffness laminates. Past research in variable stiffness laminates has focused on the use of predefined fiber paths that can be mapped spatially by algebraic equations. However, it was found that these fiber paths only produce optimal designs for a limited range of load cases, boundary conditions and geometry. In this thesis, a two-level optimization method with a post optimization repair algorithm is presented. In the first level optimization, optimal lamination parameter distributions are obtained through compliance minimization using a gradient-based optimizer. Second, Genetic Algorithm (GA) based optimization is used to perform unconstrained norm minimization which returns an element-wise distribution of ply angles in each layer. In this second level optimization many of the elements do not completely converge resulting in discontinuities of fiber angles between elements. A repair algorithm that works by using the average ply angles of surrounding elements is implemented to remedy the problem, and is demonstrated to produce smooth continuous fiber paths. We find that in most cases the post repair compliance to be lower than that of the post-Genetic Algorithm compliance which will in turn yield a higher stiffness per unit mass plate.
Author : Daniel Gay
Publisher : CRC Press
ISBN 13 : 1420045202
Total Pages : 564 pages
Book Rating : 4.4/5 (2 download)
Download or read book Composite Materials written by Daniel Gay and published by CRC Press. This book was released on 2007-04-25 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Responding to the need for a single reference source on the design and applications of composites, Composite Materials: Design and Applications, Second Edition provides an authoritative examination of the composite materials used in current industrial applications and delivers much needed practical guidance to those working in this rapidly d
Author : Samuel Tsunduka IJsselmuiden
Publisher :
ISBN 13 : 9789461130327
Total Pages : pages
Book Rating : 4.1/5 (33 download)
Download or read book Optimal Design of Variable Stiffness Composite Structures Using Lamination Parameters written by Samuel Tsunduka IJsselmuiden and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christos Kassapoglou
Publisher : John Wiley & Sons
ISBN 13 : 1119957060
Total Pages : 303 pages
Book Rating : 4.1/5 (199 download)
Download or read book Design and Analysis of Composite Structures written by Christos Kassapoglou and published by John Wiley & Sons. This book was released on 2011-07-05 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: Design and Analysis of Composite Structures enables graduate students and engineers to generate meaningful and robust designs of complex composite structures. Combining analysis and design methods for structural components, the book begins with simple topics such as skins and stiffeners and progresses through to entire components of fuselages and wings. Starting with basic mathematical derivation followed by simplifications used in real-world design, Design and Analysis of Composite Structures presents the level of accuracy and range of applicability of each method. Examples taken from actual applications are worked out in detail to show how the concepts are applied, solving the same design problem with different methods based on different drivers (e.g. cost or weight) to show how the final configuration changes as the requirements and approach change. Provides a toolkit of analysis and design methods to most situations encountered in practice, as well as analytical frameworks and the means to solving them for tackling less frequent problems. Presents solutions applicable to optimization schemes without having to run finite element models at each iteration, speeding up the design process and allowing examination of several more alternatives than traditional approaches. Includes guidelines showing how decisions based on manufacturing considerations affect weight and how weight optimization may adversely affect the cost. Accompanied by a website at www.wiley.com/go/kassapoglou hosting lecture slides and solutions to the exercises for instructors.
Author : J. N. Reddy
Publisher : CRC Press
ISBN 13 : 1351423053
Total Pages : 336 pages
Book Rating : 4.3/5 (514 download)
Download or read book Practical Analysis of Composite Laminates written by J. N. Reddy and published by CRC Press. This book was released on 2018-02-06 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are increasingly used in aerospace, underwater, and automotive structures. They provide unique advantages over their metallic counterparts, but also create complex challenges to analysts and designers. Practical Analysis of Composite Laminates presents a summary of the equations governing composite laminates and provides practical methods for analyzing most common types of composite structural elements. Experimental results for several types of structures are included, and theoretical and experimental correlations are discussed. The last chapter is devoted to practical analysis using Designing Advanced Composites (DAC), a PC-based software on the subject. This comprehensive text can be used for a graduate course in mechanical engineering, and as a valuable reference for professionals in the field.
Author : Nikolai Vladimirovich Banichuk
Publisher : Springer Science & Business Media
ISBN 13 : 1461336767
Total Pages : 326 pages
Book Rating : 4.4/5 (613 download)
Download or read book Problems and Methods of Optimal Structural Design written by Nikolai Vladimirovich Banichuk and published by Springer Science & Business Media. This book was released on 2013-03-13 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt: The author offers a systematic and careful development of many aspects of structural optimization, particularly for beams and plates. Some of the results are new and some have appeared only in specialized Soviet journals, or as pro ceedings of conferences, and are not easily accessible to Western engineers and mathematicians. Some aspects of the theory presented here, such as optimiza tion of anisotropic properties of elastic structural elements, have not been con sidered to any extent by Western research engineers. The author's treatment is "classical", i.e., employing classical analysis. Classical calculus of variations, the complex variables approach, and the Kolosov Muskhelishvili theory are the basic techniques used. He derives many results that are of interest to practical structural engineers, such as optimum designs of structural elements submerged in a flowing fluid (which is of obvious interest in aircraft design, in ship building, in designing turbines, etc.). Optimization with incomplete information concerning the loads (which is the case in a great majority of practical design considerations) is treated thoroughly. For example, one can only estimate the weight of the traffic on a bridge, the wind load, the additional loads if a river floods, or possible earthquake loads.
Author : Pedro P. Camanho
Publisher : Springer Science & Business Media
ISBN 13 : 1402085842
Total Pages : 321 pages
Book Rating : 4.4/5 (2 download)
Download or read book Mechanical Response of Composites written by Pedro P. Camanho and published by Springer Science & Business Media. This book was released on 2008-06-20 with total page 321 pages. Available in PDF, EPUB and Kindle. Book excerpt: Themethodologyfordesigninghigh-performancecompositestructuresisstill evo- ing. The complexity of the response of composite materials and the dif?culties in predicting the composite material properties from the basic properties of the c- stituents result in the need for a well-planned and exhaustive test program. The recommended practice to mitigate the technological risks associated with advanced composite materials is to substantiate the performance and durability of the design in a sequence of steps known as the Building Block Approach. The Building Block Approach ensures that cost and performance objectives are met by testing greater numbers of smaller, less expensive specimens. In this way, technology risks are assessed early in the program. In addition, the knowledge acquired at a given level of structural complexity is built up before progressing to a level of increased complexity. Achieving substantiation of structural performance by testing alone can be p- hibitively expensive because of the number of specimens and components required to characterize all material systems, loading scenarios and boundary conditions. Building Block Approachprogramscan achieve signi?cant cost reductionsby se- ing a synergy between testing and analysis. The more the development relies on analysis, the less expensive it becomes. The use of advanced computational models for the prediction of the mechanical response of composite structures can replace some of the mechanical tests and can signi?cantly reduce the cost of designing with composites while providing to the engineers the information necessary to achieve an optimized design.
Author : O.O. Ochoa
Publisher : Springer Science & Business Media
ISBN 13 : 9780792311256
Total Pages : 234 pages
Book Rating : 4.3/5 (112 download)
Download or read book Finite Element Analysis of Composite Laminates written by O.O. Ochoa and published by Springer Science & Business Media. This book was released on 1992-09-30 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are increasingly used in aerospace, underwater, and automotive structures. To take advantage of the full potential of composite materials, structural analysts and designers must have accurate mathematical models and design methods at their disposal. The objective of this monograph is to present the laminated plate theories and their finite element models to study the deformation, strength and failure of composite structures. Emphasis is placed on engineering aspects, such as the analytical descriptions, effective analysis tools, modeling of physical features, and evaluation of approaches used to formulate and predict the response of composite structures. The first chapter presents an overview of the text. Chapter 2 is devoted to the introduction of the definitions and terminology used in composite materials and structures. Anisotropic constitutive relations and Iaminate plate theories are also reviewed. Finite element models of laminated composite plates are presented in Chapter 3. Numerical evaluation of element coefficient matrices, post-computation of strains and stresses, and sample examples of laminated plates in bending and vibration are discussed. Chapter 4 introduces damage and failure criteria in composite laminates. Finally, Chapter 5 is dedicated to case studies involving various aspects and types of composite structures. Joints, cutouts, woven composites, environmental effects, postbuckling response and failure of composite laminates are discussed by considering specific examples.
Author : I.H. Marshall
Publisher : Springer
ISBN 13 :
Total Pages : 872 pages
Book Rating : 4.3/5 (91 download)
Download or read book Composite Structures written by I.H. Marshall and published by Springer. This book was released on 1991-09-30 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt: The papers contained herein were presented at the Sixth International Conference on Composite Structures (ICCS/6) held at Paisley College, Scotland in September 1991. The Conference was organised and sponsored by Paisley College. It was co-sponsored by Scottish Enterprise, the National Engineering Laboratory, the US Army Research, Development and Standardisation Group-UK, Strathclyde Regional Council and Renfrew District Council. It forms a natural and ongoing progression from the highly successful ICCS/1/2/3/4 and 5 held at Paisley in 1981, 1983, 1985, 1987 and 1989 respectively. As we enter the final decade of this century many organisations throughout the world are adopting a prophetic role by attempting to forecast future scientific advances and their associated impact on mankind. Although some would argue that to do so is folly, without such futuristic visionaries the world would be that much poorer. IntelJigent speculation based on research trends and historical advances, rather than fanciful theories, breathes a healthy air of enthusiasm into the scientific community. Surely this is the very oxygen necessary to ignite the fir~s of innovation and invention amongst pioneers of research.
Author : Martin Philip Bendsoe
Publisher : Springer Science & Business Media
ISBN 13 : 3662050862
Total Pages : 381 pages
Book Rating : 4.6/5 (62 download)
Download or read book Topology Optimization written by Martin Philip Bendsoe and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: The topology optimization method solves the basic enginee- ring problem of distributing a limited amount of material in a design space. The first edition of this book has become the standard text on optimal design which is concerned with the optimization of structural topology, shape and material. This edition, has been substantially revised and updated to reflect progress made in modelling and computational procedures. It also encompasses a comprehensive and unified description of the state-of-the-art of the so-called material distribution method, based on the use of mathematical programming and finite elements. Applications treated include not only structures but also materials and MEMS.
Author : Liviu Librescu
Publisher : Springer Science & Business Media
ISBN 13 : 1402042035
Total Pages : 627 pages
Book Rating : 4.4/5 (2 download)
Download or read book Thin-Walled Composite Beams written by Liviu Librescu and published by Springer Science & Business Media. This book was released on 2006-01-15 with total page 627 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This is the first monograph devoted to the foundation of the theory of composite anisotropic thin-walled beams and to its applications in various problems involving the aeronautical/aerospace, helicopter, naval and mechanical structures. Throughout the theoretical part, an effort was made to provide the treatment of the subject by using the equations of the 3-D elasticity theory. Non-classical effects such as transverse shear, warping constraint, anisotropy of constituent materials yielding the coupling of twist-bending (lateral), bending (transversal)-extension have been included and their implications have been thoroughly analyzed. Thermal effects have been included and in order to be able to circumvent their deleterious effects, functionally graded materials have been considered in their construction. Implications of the application of the tailoring technique and of the active feedback control on free vibration, dynamic response, instability and aeroelasticity of such structures have been amply investigated. Special care was exercised throughout this work to address and validate the adopted solution methodologies and the obtained results against those available in the literature and obtained via numerical or experimental means.
Author : Aurelio L. Araujo
Publisher : Springer
ISBN 13 : 3319445073
Total Pages : 293 pages
Book Rating : 4.3/5 (194 download)
Download or read book Smart Structures and Materials written by Aurelio L. Araujo and published by Springer. This book was released on 2016-12-20 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work was compiled with expanded and reviewed contributions from the 7th ECCOMAS Thematic Conference on Smart Structures and Materials, that was held from 3 to 6 June 2015 at Ponta Delgada, Azores, Portugal. The Conference provided a comprehensive forum for discussing the current state of the art in the field as well as generating inspiration for future ideas specifically on a multidisciplinary level. The scope of the Conference included topics related to the following areas: Fundamentals of smart materials and structures; Modeling/formulation and characterization of smart actuators, sensors and smart material systems; Trends and developments in diverse areas such as material science including composite materials, intelligent hydrogels, interfacial phenomena, phase boundaries and boundary layers of phase boundaries, control, micro- and nano-systems, electronics, etc. to be considered for smart systems; Comparative evaluation of different smart actuators and sensors; Analysis of structural concepts and designs in terms of their adaptability to smart technologies; Design and development of smart structures and systems; Biomimetic phenomena and their inspiration in engineering; Fabrication and testing of smart structures and systems; Applications of smart materials, structures and related technology; Smart robots; Morphing wings and smart aircrafts; Artificial muscles and biomedical applications; Smart structures in mechatronics; and Energy harvesting.
