Download or read book Buckling and Failure of Compression Loaded Composite Cylindrical Shells with Geometric and Material Imperfections written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-29 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental and numerical study of the effects of initial imperfections on the buckling response and failure of unstiffened thin-walled compression-loaded graphite-epoxy cylindrical shells are presented. The shells considered in the study have six different orthotropic or quasi-isotropic shell-wall laminates and two different shell-radius-to-thickness ratios. The numerical results include the effects of geometric shell-wall mid-surface imperfections, shell-wall thickness variations, local shell-wall ply-gaps associated with the fabrication process, shell-end geometric imperfections, nonuniform end loads, and the effects of elastic boundary conditions. Selected cylinder parameter uncertainties were also considered. Results that illustrate the effects of imperfections and uncertainties on the nonlinear response characteristics, buckling loads and failure the shells are presented. In addition, a common failure analysis is used to predict material failures in the shells.Hilburger, Mark W. and Starnes, James H., Jr.Langley Research CenterBUCKLING; DEFECTS; COMPOSITE MATERIALS; FAILURE ANALYSIS; CYLINDRICAL SHELLS; ISOTROPY; SHELLS (STRUCTURAL FORMS); BOUNDARY CONDITIONS; LOADS (FORCES)
Download or read book Parametric Study on the Response of Compression Loaded Composite Shells with Geometric and Material Imperfections written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a parametric study of the effects of initial imperfections on the buckling and postbuckling response of three unstiffened thinwalled compression-loaded graphite-epoxy cylindrical shells with different orthotropic and quasi-isotropic shell-wall laminates are presented. The imperfections considered include initial geometric shell-wall midsurface imperfections, shell-wall thickness variations, local shell-wall ply-gaps associated with the fabrication process, shell-end geometric imperfections, nonuniform applied end loads, and variations in the boundary conditions including the effects of elastic boundary conditions. A high-fidelity nonlinear shell analysis procedure that accurately accounts for the effects of these imperfections on the nonlinear responses and buckling loads of the shells is described. The analysis procedure includes a nonlinear static analysis that predicts stable response characteristics of the shells and a nonlinear transient analysis that predicts unstable response characteristics.Hilburger, Mark W. and Starnes, James H., Jr.Langley Research CenterSHELLS (STRUCTURAL FORMS); COMPRESSION LOADS; PARAMETERIZATION; CYLINDRICAL SHELLS; COMPOSITE STRUCTURES; FABRICATION; BUCKLING; NONLINEARITY; BOUNDARY CONDITIONS; ISOTROPY; DEFECTS; FINITE ELEMENT METHOD; GRAPHITE-EPOXY COMPOSITES; ELASTIC PROPERTIES
Download or read book Buckling of Composite Cylindrical Shells with Geometric Thickness and Material Imperfections written by Yiwei Li and published by . This book was released on 1996 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Influence of Initial Geometric Imperfections on the Buckling and Postbuckling Behavior of Fiber reinforced Cylinderical Shells Under Uniform Axial Compression written by N. S. Khot and published by . This book was released on 1968 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of initial geometric imperfections on the buckling and postbuckling behavior of composite cylindrical shells subjected to uniform axial compression is studied in this report. The solution is obtained by employing von Karman-Donnell nonlinear strain-displacement relations and the principle of stationary potential energy. Numerical results are given for various fiber orientations in the three-layer shell consisting of either glass-epoxy or boron-epoxy composites, with different initial imperfections. Results indicate that the boron-epoxy composite shells are less imperfection sensitive than the glass-epoxy composite shells. Isotropic shells are found to be more imperfection sensitive than composite shells. It is noticed that the increase or decrease in the classical buckling load with change in fiber orientation is generally accompanied by a decrease or increase in imperfection sensitivity of the shell.
Download or read book Elastic Stability of Circular Cylindrical Shells written by N. Yamaki and published by Elsevier. This book was released on 1984-02-01 with total page 573 pages. Available in PDF, EPUB and Kindle. Book excerpt: The object of this book is to clarify the whole aspect of the basic problems concerning the elastic stability of of circular cylindrical shells under typical loading conditions. The book deals with buckling, postbuckling and initial postbuckling problems under one of the three fundamental loads, that is, torsion, pressure and compression. The emphases are placed on the accurate analysis and comprehensive numeral results for the buckling problem, experimental verification of the theoretical analysis for the postbuckling problem and clarification of the range of applicability of the perturbation method for the analysis of initial postbuckling behaviors and imperfection sensitivity. The problems under typical combined loads as well as the influence of the contained liquid are also clarified.
Download or read book Buckling of Shell Structures on Land in the Sea and in the Air written by J.F. Jullien and published by CRC Press. This book was released on 1991-09-09 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides better inputs for improvement of the buckling load predictions of stiffened cylindrical shells subjected to combined loading. It is based on the International Colloquium Buckling of shell structures, on land, in the sea and in the air, Lyon, France, 17 September 1991.
Download or read book Buckling of Bars Plates and Shells written by Robert Millard Jones and published by Bull Ridge Corporation. This book was released on 2006 with total page 850 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling of Thin Metal Shells written by J.G. Teng and published by CRC Press. This book was released on 2006-06-28 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin-walled metal shell structures are highly efficient in their use of material, but they are particularly sensitive to failure by buckiling. Many different forms of buckling can occur for different geometries and different loading conditions. Because this field of knowledge is both complex and industrially important, it is of great interest and c
Download or read book Buckling of Structures written by I. Elishakoff and published by Elsevier. This book was released on 2013-10-22 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers, written by friends and colleagues of Josef Singer, presents a comprehensive and timely review of the theoretical mechanics of thin shell-structures. Topics of great current interest such as the buckling of composite plates and shells, the plastic buckling of thin-walled structures and the optimum design of buckling sensitive curved composite panels are examined by experts, using a great diversity of approaches, whereby theoretical predictions are compared with experimental results whenever possible.Other topics reviewed include the buckling and post-buckling behaviour of imperfect shells under different external static or dynamic loads and a variety of boundary conditions. Papers dealing with the vibration and the dynamic response of thin elastic bodies are also presented.A strong emphasis is made on the practical applications aspect in the theories presented. Thus engineers, research workers and students who are involved with the design and analysis of shell structures made of different materials, and subjected to various static and dynamic loads will find this volume an invaluable source of reference.
Download or read book The Effects of Initial Imperfections on the Buckling of Composite Cylindrical Shells written by JH. Starnes and published by . This book was released on 2001 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental and analytical study of the effects of initial imperfections on the buckling response of thin unstiffened graphite-epoxy cylindrical shells with and without a cutout, and with three different shell-wall laminates, are presented. Results that identify the individual and combined effects of traditional initial geometric shell-wall imperfections, and nontraditional shell-wall thickness variations, shell-end geometric imperfections, and variations in loads applied to the ends of the shells on the shell buckling and nonlinear responses, are included. The shells have been analyzed with a robust nonlinear finite-element analysis code for shells that accurately accounts for these effects on the buckling and nonlinear responses of the shells. The analysis results generally correlate well with the experimental results. The nonlinear analysis results are also compared with the results from a traditional linear bifurcation buckling analysis that is commonly used for shell design. The results suggest that the nonlinear analysis procedure can be used for determining accurate, high-fidelity, design knockdown factors for shell buckling and collapse. A discussion of how this high-fidelity nonlinear analysis procedure can be used to form the basis for a shell analysis and design approach that addresses some of the critical shell-buckling design criteria and design considerations for composite shell structures is included.
Download or read book Buckling of Stiffened Cylinders in Axial Compression and Bending written by James P. Peterson and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Buckling data review for stiffened cylinder failures during axial compression and bending.
Download or read book Buckling of Shells written by Ekkehard Ramm and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thin shells are very popular structures in many different branches of engineering. There are the domes, water and cooling towers, the contain ments in civil engineering, the pressure vessels and pipes in mechanical and nuclear engineering, storage tanks and platform components in marine and offshore engineering, the car bodies in the automobile industry, planes, rockets and space structures in aeronautical engineering, to mention only a few examples of the broad spectrum of application. In addition there is the large applied mechanics group involved in all the computational and experimental work in this area. Thin shells are in a way optimal structures. They play the role of·the "primadonnas" among all kinds of structures. Their performance can be extraordinary, but they can also be very sensitive. The susceptibility to buckling is a typical example. David Bushnell says in his recent review paper entitled "Buckling of Shells - Pitfall for DeSigners": "To the layman buckling is a mysterious, perhaps even awe inspiring phenomenon that transforms objects originally imbued with symmetrical beauty into junk".
Download or read book The Effect of Initial Imperfections on the Buckling Stress of Cylindrical Shells written by Charles D. Babcock and published by . This book was released on 1963 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling of Composite Cylindrical Shells Under Axial and Radial Loading written by Ming Min Lei and published by . This book was released on 1968 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stability and Vibrations of Thin Walled Composite Structures written by Haim Abramovich and published by Woodhead Publishing. This book was released on 2017-05-29 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stability and Vibrations of Thin-Walled Composite Structures presents engineering and academic knowledge on the stability (buckling and post buckling) and vibrations of thin walled composite structures like columns, plates, and stringer stiffened plates and shells, which form the basic structures of the aeronautical and space sectors. Currently, this knowledge is dispersed in several books and manuscripts, covering all aspects of composite materials. The book enables both engineers and academics to locate valuable, up-to-date knowledge on buckling and vibrations, be it analytical or experimental, and use it for calculations or comparisons. The book is also useful as a textbook for advanced-level graduate courses. Presents a unified, systematic, detailed and comprehensive overview of the topic Contains contributions from leading experts in the field Includes a dedicated section on testing and experimental results
Download or read book Numerical and Experimental Study of the Compression Response of Composite Cylindrical Shells with Cutouts written by Mark William Hilburger and published by . This book was released on 1998 with total page 718 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Buckling of Structures written by Josef Singer and published by Elsevier Publishing Company. This book was released on 1988 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection of papers, written by friends and colleagues of Josef Singer, presents a comprehensive and timely review of the theoretical mechanics of thin shell-structures. Topics of great current interest such as the buckling of composite plates and shells, the plastic buckling of thin-walled structures and the optimum design of buckling sensitive curved composite panels are examined by experts, using a great diversity of approaches, whereby theoretical predictions are compared with experimental results whenever possible. Other topics reviewed include the buckling and post-buckling behaviour of imperfect shells under different external static or dynamic loads and a variety of boundary conditions. Papers dealing with the vibration and the dynamic response of thin elastic bodies are also presented. A strong emphasis is made on the practical applications aspect in the theories presented. Thus engineers, research workers and students who are involved with the design and analysis of shell structures made of different materials, and subjected to various static and dynamic loads will find this volume an invaluable source of reference.
