Download or read book Analysis of Thick Sectioned Composite Cylindrical Shells Under Hydrostatic Pressure written by FG. Yuan and published by . This book was released on 1993 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: This article describes the mechanical behavior of thick-sectioned composite laminated shells subjected to hydrostatic pressure. The analysis is based on the theory of cylindrical anisotropic elasticity using a stress function approach. Quasi-isotropic laminated shells are used to demonstrate the influence of shell thickness, stacking sequence, and number of repeating sublaminates on thestrain and stress response. The effect of residual stress on the behavior of the shells is also examined.

Download or read book Composite Materials written by Eugene T. Camponeschi and published by ASTM International. This book was released on 1993 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nonlinear Stability Analysis of Thick Composite Cylindrical Shells written by Steve S. Hsiung and published by . This book was released on 1996 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Oval Cylindrical Shells Under Lateral and Hydrostatic Pressure written by F. Romano and published by . This book was released on 1960 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents and analysis of the deflections of and stresses in a noncircular cylindrical shell of uniform wall thickness whose median-surface cross section is described analytically by a simple expression corresponding to a family of doubly-symmetric ovals. In particular, two problems are considered: a simply supported cylindrer under uniform lateral load, and a hydrostatically-loaded, clamped cylinder whose end sections are permitted constant axial displacement. (Author).

Download or read book On the Axisymmetric Collapse of Cylindrical Shells Under External Hydrostatic Pressure written by S. D. Lee and published by . This book was released on 1967 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Stress and Displacement Analysis of a Clamped Noncircular Cylindrical Shell Under Hydrostatic Pressure written by William P. Vafakos and published by . This book was released on 1961 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: Deflections and stresses are analyzed for a noncircular cylindrical shell of uniform wall thickness under hydrostatic load and with its edges clamped in such a fashion that the end sections remain plane and normal to the axis. By assuming a Fourier series in the closed circumferential direction and using the principle of the minimum of the total potential, the partial differential equations of equili rium are replaced by a set of ordinary differential equa ions. The displacements obtained by solving these equations are used to obtain the stresses. The results are then compared with those obtained by 2 simple approximate solutions for circular cylindrical shells. Numerical results are obtained for an oval shell with a circumference-to-wall thickness ratio of 576, a circumference-to-axial length ratio of 24, and a major-to-minor axis ratio of 1.10. The maximum radial displacement occurs at points on the shell determined by the intersection of the midlength cross section with the generators representing the loci of least curvature. The maximum stress is an axial stress due principally to bending, and occurs at those points of the clamped edges having the least curvature.

Download or read book Stress Analysis of a Composite Cylindrical Shell Having Surface Crack written by Belachew Amare and published by LAP Lambert Academic Publishing. This book was released on 2013-01 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composite materials are combinations of two or more materials giving a third material with highly desirable properties. A composite material cylindrical shell is one of the components used in weight sensitive areas as composite materials are nowadays commonly used in the aviation industry and marine applications. In many practical applications, using composites is more efficient. For example, in highly competitive airline markets, one is continuously looking for ways to lower overall mass of the aircraft without decreasing the stiffness and strength of its components like cylindrical shells or pressure vessels. This is possible by replacing conventional metal alloys with composite materials. However, surface irregularities and micro cracks can be imparted to such materials for various reasons and it is very important to analyze these materials carefully to hinder the damage that could result as a result of failure.

Download or read book Structural Analysis of Cylindrical Composite Shells with Stiffening rings Subjected to External Hydrostatic Pressure written by Daniel Nicholas Kosareo and published by . This book was released on 1994 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Design and Analysis of Orthotrophic Ring Stiffened Cylindrical Shells Subjected to External Hydrostatic Pressure written by and published by . This book was released on 2008 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Three theories are presented for the analysis of ring-stiffened or monocoque cylindrical shells under hydrostatic pressure. The theories compute the stress state and the axisymmetric collapse, interbay buckling, and general instability pressures from external hydrostatic pressure loading. The theories were derived for the case of specially orthotropic material with theoretically uniform properties through the thickness; the theories apply equally to shells made of isotropic materials. A computer program, DAPS4 (Design and Analysis of Plastic Shells, Version 4), was written that incorporates these theories that can be used as an initial sizing tool or analysis of a shell's hydrostatic pressure capability. The program includes a "pseudo-plastic" method to account for the reduction of computed collapse pressures when the stress state is above the proportional limit of the material's stress-strain curve. The purpose of this report is to document the theories and the code. Correlation with numerous pressure tests is shown. A user manual with example problems is included.

Download or read book Analysis of the Inelastic Behavior of Transversely Reinforced Cylindrical Shells Under Hydrostatic Pressure written by and published by . This book was released on 1950 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of the Inelastic Behavior of Transversely Reinforced Cylindrical Shells Under Hydrostatic Pressure written by J. Kempner and published by . This book was released on 1950 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Response of Composite Cylindrical Shells Under External Impulsive Loads written by Sunil George Pothula and published by . This book was released on 2009 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Dynamic pulse buckling, vibration and failure of laminated, composite cylindrical shells subjected to blast loading were studied. The dynamic response of the shells with orthotropic, symmetric, anti-symmetric and quasi-isotropic layups subjected to both uniform and asymmetric pressure pulse loading (side-on explosion) were examined by use of Fourier series and Lagrange's equation of motion. The solutions for the radial shell deformations were represented by Mathieu differential equations. Dynamic stability of the shells was determined from a Mathieu stability diagram. It was found that the stability of the shells were affected by lay-up, aspect ratio as well as impulse distribution. The stable vibration response of the orthotropic cylindrical shell with side-on explosion compared well with finite element solutions using an implicit dynamic analysis in ABAQUS Standard. First-ply failure of the orthotropic composite cylindrical shell was predicted using a modified Hashin-Rotem failure criterion. It was observed that the thinner shell were more likely to fail by dynamic instability, whereas the thicker shells were more likely to fail by first-ply failure."--Abstract.

Download or read book ANALYSIS FOR DETERMINING STRESSES IN STIFFINED CYLINDRICAL SHELLS NEAR STRUCTURAL DISCONTINUITIES written by and published by . This book was released on 1959 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent developments in structural research on circular ring-stiffened cylinders subjected to hydrostatic pressure have indicated that refinements of the standard strength analysis are required to account for the effects of discontinuities such as a heavy frame or bulkhead or variations in shell thickness. A procedure has been developed for computating axisymmetric stresses near these discontinuities in a cylinder in which the thickness of the material does not vary between a pair of stiffeners but may change from one side of a stiffener to the other. The results of this analysis indicate that stresses higher than those predicted by a standard computation will usually exist near these discontinuities. A method of reducing this effect by modifying the geometry near these points is also presented.

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1997 with total page 940 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analysis of Thin walled Cylindrical Composite Shell Structures Subject to Axial and Bending Loads written by Sthanu Mahadev and published by . This book was released on 2015 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies have focused on the modeling and response characterization of composite structural members, with particular emphasis on thin-walled cylindrical composite shells. This class of shell configurations is explored to determine their mechanical response in primary aerospace structural members. The present work is focused on formulating a modified composite shell theory prognosis methodology for investigating the structural response of thin-walled cylindrical shell type composite configurations under axial and bending loads, respectively. The prime motivation to develop this theory arises from its capability to generate simple yet accurate closed-form analytical results that can efficiently charecterize cylindrical composite shell constructions. This work shows the development of a novel mathematical framework to predict key structural characteristics such as axial stiffness, bending stiffness, and centroid for thin walled composite shells. Longitudinal components of ply-stresses are analytically computed through the global stiffness matrix model for cylindrical composite tubes under thermomechanical environments. An ANSYS based FE routine is employed to compare against the analytical results. This concept development is further extended to analyze thin-walled, open cross-section, curved composite shells characterized by circumferential v arc angle, thickness-to-mean radius ratio, and total laminate thickness, respectively. The potential of this methodology is used to analytically identify the location of the centroid for such cross-sections. Ply stress variations for curved cylindrical shells are analytically examined under the application of centroidal tensile and bending loadings respectively. In-plane ply-stress estimations determined by the present model show excellent agreement in comparison with FEM results. The present work also incorporates the design and manufacturing of a novel ad-hoc testfixture set-up to experimentally characterize the extension-bending behavior in open cross-section curved composite strips. Seven symmetric, balanced curved composite test specimens are fabricated. This investigation introduces a new testing methodology to measure longitudinal surface strain fields and predict the centroid location via implementing a non-contact, full field strain measurement technique, Digital Image Correlation (DIC). Experimental measurements are compared against analytical results. This work is shown to essentially capture the mechanical response of cylindrical shells by providing an efficient and effective mathematical tool for structural engineers.

Download or read book Analysis of the Nonlinear Large Deformation Behavior of Composite Cylindrical Shells written by George John Simitses and published by . This book was released on 1982 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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)