Download or read book Minimum Weight Design of stiffened fiber composite cylinders written by T. L. Chao and published by . This book was released on 1973 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Minimum Weight Design of Stiffened Fiber Composite Cylinders written by Tung-Lai Chao and published by . This book was released on 1969 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: A structural synthesis capability for stiffened fiber composite cylindrical shells has been developed. The design variables are the configuration and material parameters. The material parameters considered are the fiber volume content and the ply orientations in the skin. Both longitudinal and circumferential stiffeners are assumed to have hat cross-sections. The instability loads of the heterogeneous anisotropic cylinder under combined axial, radial, and torsional loading are calculated with smeared stiffener theory. In the synthesis scheme, multiple load conditions on the cylinder are permissible. The optimal design problem is cast into a model of a nonlinear mathematical programming problem which is solved with the penalty function technique of Fiacco-McCormick. Since weight is independent of the ply orientations there exist alternative optima. Special modifications on the iteration procedure are made, so that the ply angles tend to move in such a way that the overall strength of the cylinder is improved. Numerical examples are discussed. (Author-PL).
Download or read book Minimum Weight Design of Axially Compressed Unstiffened and Stiffened Composite Cylinders written by Banarsi Lal Agarwal and published by . This book was released on 1975 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimal Structural Design under Stability Constraints written by Antoni Gajewski and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first optimal design problem for an elastic column subject to buckling was formulated by Lagrange over 200 years ago. However, rapid development of structural optimization under stability constraints occurred only in the last twenty years. In numerous optimal structural design problems the stability phenomenon becomes one of the most important factors, particularly for slender and thin-walled elements of aerospace structures, ships, precision machines, tall buildings etc. In engineering practice stability constraints appear more often than it might be expected; even when designing a simple beam of constant width and variable depth, the width - if regarded as a design variable - is finally determined by a stability constraint (lateral stability). Mathematically, optimal structural design under stability constraints usually leads to optimization with respect to eigenvalues, but some cases fall even beyond this type of problems. A total of over 70 books has been devoted to structural optimization as yet, but none of them has treated stability constraints in a sufficiently broad and comprehensive manner. The purpose of the present book is to fill this gap. The contents include a discussion of the basic structural stability and structural optimization problems and the pertinent solution methods, followed by a systematic review of solutions obtained for columns, arches, bar systems, plates, shells and thin-walled bars. A unified approach based on Pontryagin's maximum principle is employed inasmuch as possible, at least to problems of columns, arches and plates. Parametric optimization is discussed as well.
Download or read book Composite Materials Testing and design written by American Society for Testing and Materials Committee on High Modulus Fibers and Their Composites and published by ASTM International. This book was released on 1982 with total page 694 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992-06 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book COMPOSITE MATERIALS Testing and design written by and published by ASTM International. This book was released on 1972 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NBS Technical Note written by and published by . This book was released on 1972-06 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1971 with total page 912 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimisation of Composite Structures Design written by A Miravete and published by Elsevier. This book was released on 1996-01-01 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials have been used more and more during the last decade to lighten structures. But until now, there has been no clear way of establishing how to design properly optimised laminated composite plates with no reduction in strength. Most modern references lack adequate information for the designer wanting to tailor or synthesise a design. This exciting package offers a solution. It relates the theory of composite materials to real life and provides 'rules' for designing composites structures properly and in an optimum way.In the book, Professor Miravete demonstrates the optimisation of beams, plates and sandwich constructions in the designs of advanced composite materials. He also illustrates optimal material systems, fibre orientations and lay-up through functions of geometry, load type and boundary conditions. The associates software, on two disks, will enableusers to adapt the information to their own requirements and is very user-friendly with helpful manuals. This will be an essential package for designers and engineers in a wide range of areas, from aeronautics to automotive andmarine as well as general industry.Chapter 1 provides a general background on composite materials.Chapters 2, 3, 4, and 5 are concerned with constant thickness composite structures, and provide a survey of various design methodologies of shells, plates and sandwich constructions.Chapters 6, 7, 8 and 9 examine variable thickness composite structures, and consider beams, plates and sandwiches. - A completemanual for anyone concerned with designing composite structures - Includes book and used-friendly software - Can be easily applied to any area - aeronautics, automotive, marine or general industry
Download or read book Minimum Weight Design Aspects of Stiffened Cylinders Under Compression written by C. Lakshmikantham and published by . This book was released on 1967 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimization Methods for Material Design of Cement based Composites written by A.M. Brandt and published by CRC Press. This book was released on 1998-06-18 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a clear, comprehensive introduction to the subject. Different problems of optimization are considered and illustrated with examples. Large sets of new experimental data are presented and discussed.
Download or read book Developments in Structural Analysis and Synthesis by Function Minimization written by Lucien A. Schmit (Jr.) and published by . This book was released on 1971 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: Function minimization methods in structural analysis and optimum design are discussed. A computer program which implements the energy search method of nonlinear finite element analysis is presented. Several recent weight optimization methods based on finite element analysis are reviewed. Special characteristics of the finite element method relevant to automated design are identified. Some efficient approximate analysis methods for optimization applications are explored. Applications of some of these methods to plane frames and finite-deflection trusses are presented.
Download or read book Torsional Instabilities in Composite and Composite reinforced Aluminum alloy Thin walled Cylinders written by Donald E. Marlowe and published by . This book was released on 1972 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analysis and Design Optimization of Grid Stiffened Composite Cylinders written by Syed Zakir Raza and published by LAP Lambert Academic Publishing. This book was released on 2010-04 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Skin-stiffener structures are extensively used in the aerospace field due to their structural efficiency in terms of stiffness/weight and strength/weight ratios. The application of such panels is primarily within fuselages and wing boxes, where the weight saving potential of composite materials compared with aluminum alloys is well known. However, design of composite panels involves the optimization of a large number of variables such as ply thickness and plate widths. Further complication arises when the expert knowledge required for laminate design is considered and when the panel is constrained by buckling under axial compression. In this study, the behavior of Grid Stiffened Composite Cylinder is examined under the axial compressive load. Compressive load causes buckling and develop stresses in the structure. For the buckling analysis two approaches are used.(1)Analytical (2)FEM. An analytical smeared stiffener theory is used to determine buckling load and then FEM results were compared to gain the confidence on the developed models. The validated FEM model and analytical smeared stiffener theory is used to conduct parametric analysis.
Download or read book Bibliography on Fibers and Composite Materials 1969 1972 written by J. N. Fleck and published by . This book was released on 1972 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bibliography contains over 3000 references, including translated items from Japan, West Germany, U.S.S.R., and other countries as well as references of original English language publications of the United States and United Kingdom. The references are categorized by specific fiber and matrix materials. In addition, many references are grouped in the general categories of compatibility studies, theory and design, testing and evaluation, application, and fabrication. A group of references to general review articles is included. The references represent the holdings of the former Defense Ceramic Information Center (DCIC) plus those of the Fibers and Composites Center (FCIC) at Battelle's Columbus Laboratories and MCIC. (Author).
Download or read book Torsional Shear Strength of Filament wound Glass epoxy Tubes written by L. David Wall (Jr.) and published by . This book was released on 1971 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented from torsion tests conducted on 36 multilayered, filament-wound, glass-epoxy tubes. Configurations with helical windings and with alternating helical and circumferential windings were investigated for various winding angles. Under small loadings, shear moduli deduced from linear shear stress-strain curves were found to be in reasonable agreement with analytical predictions. Under larger loadings, various degrees of nonlinearity in shear stress-strain curves were encountered, depending on the helical winding angle. Experimental torsional strengths were defined by a 0.2 -percent offset yield stress or by maximum stress when large nonlinearities did not exist. These strengths were compared with torsional buckling predictions for orthotropic cylinders, and with material strength predictions based on orthotropic yield criteria and elastic stress analysis. Computed elastic buckling stresses were considerably higher than the experimental strengths for most of the test specimens except for those with only 30° and 45 [degree] windings. Experimental torsional strengths- were found to correlate with conventional yield predictions if predicted yielding in certain layers were ignored or if unrealistically large transverse tensile and shear strengths of unidirectional laminae were employed in the analysis.
