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Optimization Of Composite Structures Optimum Cost And Weight Design For A Cylindrical Shell Subjected To Re Entry Loads And Heating
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Book Synopsis Optimization of Composite Structures: Optimum Cost and Weight Design for a Cylindrical Shell Subjected to Re-entry Loads and Heating by : Edgar Gebrath Menkes
Download or read book Optimization of Composite Structures: Optimum Cost and Weight Design for a Cylindrical Shell Subjected to Re-entry Loads and Heating written by Edgar Gebrath Menkes and published by . This book was released on 1969 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1971 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index by :
Download or read book Comprehensive Dissertation Index written by and published by . This book was released on 1973 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aeronautical Engineering written by and published by . This book was released on 1972 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 1968 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimum Design of Ring Stiffened Cylindrical Shells by : Allen J. Bronowicki
Download or read book Optimum Design of Ring Stiffened Cylindrical Shells written by Allen J. Bronowicki and published by . This book was released on 1974 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with the optimum structural design of circular cylindrical shells reinforced with identical uniformly spaced T-ring stiffeners, and subjected to external pressure loading. The optimization problems considered are of three types: (1) minimum-weight design, (2) design for maximum separation of the lowest two natural frequencies, and (3) design for maximum separation of the lowest two natural frequencies which have primarily axial content. Gross buckling is precluded by specifying a minimum natural frequency, and additional behavioral constraints preclude yielding or buckling of panels, T-ring stiffeners, and web and flange instabilities within each T-ring. Analysis is based on use of an equivalent orthotropic shell model, and optimization is accomplished through use of a sequential unconstrained minimization technique. (Modified author abstract).
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724322425 Total Pages :228 pages Book Rating :4.3/5 (224 download)
Book Synopsis Optimal Design of Geodesically Stiffened Composite Cylindrical Shells by : National Aeronautics and Space Administration (NASA)
Download or read book Optimal Design of Geodesically Stiffened Composite Cylindrical Shells written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-27 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: An optimization system based on the finite element code Computations Structural Mechanics (CSM) Testbed and the optimization program, Automated Design Synthesis (ADS), is described. The optimization system can be used to obtain minimum-weight designs of composite stiffened structures. Ply thickness, ply orientations, and stiffener heights can be used as design variables. Buckling, displacement, and material failure constraints can be imposed on the design. The system is used to conduct a design study of geodesically stiffened shells. For comparison purposes, optimal designs of unstiffened shells and shells stiffened by rings and stingers are also obtained. Trends in the design of geodesically stiffened shells are identified. An approach to include local stress concentrations during the design optimization process is then presented. The method is based on a global/local analysis technique. It employs spline interpolation functions to determine displacements and rotations from a global model which are used as 'boundary conditions' for the local model. The organization of the strategy in the context of an optimization process is described. The method is validated with an example. Gendron, G. and Guerdal, Z. Unspecified Center NASA-CR-190706, NAS 1.26:190706, CCMS-92-23, VPI-E-92-20 NAG1-643...
Download or read book NASA SP. written by and published by . This book was released on 1962 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Dissertation Index, 1861-1972: Author index by : Xerox University Microfilms
Download or read book Comprehensive Dissertation Index, 1861-1972: Author index written by Xerox University Microfilms and published by . This book was released on 1973 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis, Design and Optimization of Composite Structures by : Alexander L. Kalamkarov
Download or read book Analysis, Design and Optimization of Composite Structures written by Alexander L. Kalamkarov and published by John Wiley & Sons. This book was released on 1997-07-07 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapidly varying material and geometrical characteristics of composite materials and structures do not allow the direct study of their mechanical behavior even with the use of modern computers. This book is devoted to the mechanical design and optimization problems of composite structures, based on the previously developed asymptotic homogenization models and on the newly elaborated rigorous mathematical methods. It describes how to construct mathematically rigorous mechanical models to determine strength, stiffness, and weight minimization requirements, all important factors of design and optimization.
Book Synopsis Optimal Design of Laminated-composite Circular-cylindrical Shells Subjected to Combined Loads by : Guojun Sun
Download or read book Optimal Design of Laminated-composite Circular-cylindrical Shells Subjected to Combined Loads written by Guojun Sun and published by . This book was released on 1988 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722809294 Total Pages :26 pages Book Rating :4.8/5 (92 download)
Book Synopsis Structural Optimization of Thin Shells Using Finite Element Method by : National Aeronautics and Space Administration (NASA)
Download or read book Structural Optimization of Thin Shells Using Finite Element Method written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-11 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the present work was the structural optimization of thin shell structures that are subjected to stress and displacement constraints. In order to accomplish this, the structural optimization computer program DESAP1 was modified and improved. In the static analysis part of the DESAP1 computer program the torsional spring elements, which are used to analyze thin, shallow shell structures, were eliminated by modifying the membrane stiffness matrix of the triangular elements in the local coordinate system and adding a fictitious rotational stiffness matrix. This simplified the DESAP1 program input, improved the accuracy of the analysis, and saved computation time. In the optimization part of the DESAP1 program the stress ratio formula, which redesigns the thickness of each finite element of the structure, was solved by an analytical method. This scheme replaced the iterative solution that was previously used in the DESAP1 program, thus increasing the accuracy and speed of the design. The modified program was used to design a thin, cylindrical shell structure with optimum weight, and the results are reported in this paper. Gotsis, Pascal K. Glenn Research Center RTOP 510-01-0A...
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1044 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Determination of the Stability of Structures of Composite Materials Subjected to Intense Surface Heating (K Opredeleniyu Nesushchei Sposobnosti Konstruktsii Iz Kompozitsionnykh Materialov Pri Intensivnom Poverkhnostnom Nagrevee). by : L. G. Belozerov
Download or read book The Determination of the Stability of Structures of Composite Materials Subjected to Intense Surface Heating (K Opredeleniyu Nesushchei Sposobnosti Konstruktsii Iz Kompozitsionnykh Materialov Pri Intensivnom Poverkhnostnom Nagrevee). written by L. G. Belozerov and published by . This book was released on 1978 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of destructive heating applied to the surface of a cylindrical shell of composite material subjected to compressive end loads or uniform external pressure is considered theoretically, and the results compared with those of previously reported experiments by the same authors. The reduction in the value of critical load which occurs with increasing exposure time is considered in terms of the reducing structurally effective thickness of the wall. (Author-PL).
Book Synopsis Optimum Design of Submerged Cylindrical Shells Subjected to Dynamic Loadings by : R. B. Nelson
Download or read book Optimum Design of Submerged Cylindrical Shells Subjected to Dynamic Loadings written by R. B. Nelson and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents a procedure for the optimum design of a submerged T-ring stiffened cylindrical shell subjected to a specified harmonic excitation and external pressure. Three different design objectives can be investigated: (1) minimum structural mass, (2) minimum structural response and (3) minimum of a linear combination of structural mass and structural response. The design variables are shell thickness, T-web depth and thickness, T-flange width and thickness, and (uniform) stiffener spacing. The design constraints are on geometric admissibility, in vacuo natural frequencies of the shell, shell buckling, and on internal stresses. Numerical studies indicate the necessity of constraining the structural mass of the cylinder if minimum structural response is the design objective, and constraints must be imposed on both structural response and maximum structural mass when the combined design objective is employed.
Book Synopsis Minimum Weight Design of Stiffened Circular Cylindrical Shells Subject to Destabilizing Load by : George J. Simitses
Download or read book Minimum Weight Design of Stiffened Circular Cylindrical Shells Subject to Destabilizing Load written by George J. Simitses and published by . This book was released on 1975 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report contains a technical procedure by which one may design a fuselage type stiffened thin curcular cylindrical shell to carry safely a specified destabilizing load (uniform axial compression, uniform pressure, and torsion) individually applied.
Book Synopsis Stresses in Circular Cylindrical Shells of Composite Materials Subjected to Localized Loads by : Howard S. Kliger
Download or read book Stresses in Circular Cylindrical Shells of Composite Materials Subjected to Localized Loads written by Howard S. Kliger and published by . This book was released on 1973 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: Methods of analysis are developed to provide the stresses (both bending and membrane) and deformations in specially orthotropic circular cylindrical shells subjected to localized loads. An accurate shell theory is employed which includes the effects of orthotropy and transverse shear deformation. The governing differential equations are obtained, and are transformed into a set of algebraic equations through expanding all displacements, rotations, and the localized loading in a doubly infinite series in the shell coordinates. A computer program is formulated, and included, to perform numerical calculations easily using the analytic solutions. Comparisons and design curves are made for large variations in orthotropy which cover all known composite materials. Various sizes and shapes of localized loadings are systematically explored and reported. The various curves and tables presented can be used directly in design through interpolation. The computer program is included to permit the handling of any additional cases. (Author-PL).
