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Experimental Study of Longitudinal and Circumferential External Defect in Pressured Cylindrical Shells  [PDF]
A. Elhakimi, A. Chamat, A. Touache, A. Daya, S. Hariri
World Journal of Mechanics (WJM) , 2015, DOI: 10.4236/wjm.2015.56011
Abstract: Two cylindrical vessels under internal pressure are used for this work in order to study the influence of the position and size of defects on their elastic and elastoplastic behavior. One contains two external longitudinal semi-elliptic defects of different dimensions realized diametrically opposed. The other contains the same defects but is circumferential. These defects are carried out by elect-erosion. Strain gauges are placed in the neighborhood of the defects of which the purpose is to obtain the strain distribution. This work also allows the comparison between two defects of different dimensions, which are of the same shape or different shapes. These defects are longitudinal and circumferential semi-elliptical. The position of these defects relative to the inner radius of a cylindrical pressure vessel is considered. The deformations results are discussed.
Experimental Investigation on the Buckling Process of Water-filled Metal Cylindrical Shells under Axial Impact
充满水的金属圆柱壳经受轴向撞击时屈曲过程的实验研究

LEI Jian-ping,CHENG Guo-qiang,ZHANG Shan-yuan,
雷建平
,程国强

实验力学 , 2002,
Abstract: Experimental results for the buckling process of cylindrical shells fully filled with water under axial impact are reported. Low velocity and large mass impact tests are carried out by means of a dropping hammer device. The experiment indicates that the buckling of shells takes place in an axisymmetric mode, and the whole impact process can be divided into three stages, i.e. dynamic loading, dynamic post-buckling and elastic unloading. The effect of the height and thickness of the cylindrical shells on the phenomena is discussed.
Oscillations of Spherical and Cylindrical Shells  [PDF]
Serkan Erdin,Valery L. Pokrovsky
Physics , 2000, DOI: 10.1142/S021797920100721X
Abstract: We have found the complete spectrum and eigenstates for harmonic oscillations of ideal spherical and cylindrical shells, both being infinitely thin. The spectrum of the cylindrical shell has an infinite number of Goldstone modes corresponding to folding deformations. This infrared catostrophe is overcome by accounting for curvature-part of energy.
Static Cylindrical Matter Shells  [PDF]
Metin Arik,Ozgur Delice
Physics , 2004, DOI: 10.1007/s10714-005-0123-y
Abstract: Static cylindrical shells composed of massive particles arising from matching of two different Levi-Civita space-times are studied for the shell satisfying either isotropic or anisotropic equation of state. We find that these solutions satisfy the energy conditions for certain ranges of the parameters.
Notes on static cylindrical shells  [PDF]
Jiri Bicak,Martin Zofka
Physics , 2002, DOI: 10.1088/0264-9381/19/14/307
Abstract: Static cylindrical shells made of various types of matter are studied as sources of the vacuum Levi-Civita metrics. Their internal physical properties are related to the two essential parameters of the metrics outside. The total mass per unit length of the cylinders is always less than 1/4. The results are illustrated by a number of figures.
Performance of cylindrical-conical cyclones with different geometrical configurations
Santana, J.D.A.M.;Arnosti Jr., S.;Coury, J.R.;
Brazilian Journal of Chemical Engineering , 2001, DOI: 10.1590/S0104-66322001000300003
Abstract: the present work is a continuation of a study of the influence of geometric characteristics on the performance of reverse-flow cylindrical-conical cyclones. after studying the behavior of the pressure drop in previous work (arnosti et al., 1998), here performance in terms of collection efficiency in the removal of particulate material is addressed. the independent variables considered in this study were inlet gas velocity (three velocities) and the following dimensions of the cyclone: the cylindrical section (three heights) and internal height of the gas exit duct (three heights). the tests were performed using an 33 experimental design. analysis of the results for overall efficiency was carried out using response surfaces and the statistical parameters were estimated from linear regression.
Performance of cylindrical-conical cyclones with different geometrical configurations  [cached]
Santana J.D.A.M.,Arnosti Jr. S.,Coury J.R.
Brazilian Journal of Chemical Engineering , 2001,
Abstract: The present work is a continuation of a study of the influence of geometric characteristics on the performance of reverse-flow cylindrical-conical cyclones. After studying the behavior of the pressure drop in previous work (Arnosti et al., 1998), here performance in terms of collection efficiency in the removal of particulate material is addressed. The independent variables considered in this study were inlet gas velocity (three velocities) and the following dimensions of the cyclone: the cylindrical section (three heights) and internal height of the gas exit duct (three heights). The tests were performed using an 33 experimental design. Analysis of the results for overall efficiency was carried out using response surfaces and the statistical parameters were estimated from linear regression.
An Experimental Study on the Progressive Damage of Fiber Laminated Cylindrical Shells Under Axial Compression
层状纤维圆柱壳轴向压缩破损实验研究

ZHENG Jinxin,YU Zengxin,WAN Zhimin,DU Xingwen,
郑金鑫
,于增信

实验力学 , 1999,
Abstract: The broken process of fiber composite laminated cylindrical shells under axial loading is investigated experimentally. It is found that the broken mode of specimens changes with the fiber angle of composites. Some problems involving fracture toughness and energy absorption of composites are discussed.
Prediction of Vibrational Behavior of Grid-Stiffened Cylindrical Shells  [PDF]
G. H. Rahimi,M. Hemmatnezhad,R. Ansari
Advances in Acoustics and Vibration , 2014, DOI: 10.1155/2014/242573
Abstract: A unified analytical approach is applied to investigate the vibrational behavior of grid-stiffened cylindrical shells with different boundary conditions. A smeared method is employed to superimpose the stiffness contribution of the stiffeners with those of shell in order to obtain the equivalent stiffness parameters of the whole panel. Theoretical formulation is established based on Sanders’ thin shell theory. The modal forms are assumed to have the axial dependency in the form of Fourier series whose derivatives are legitimized using Stoke's transformation. A 3D finite element model is also built using ABAQUS software which takes into consideration the exact geometric configuration of the stiffeners and the shell. The achievements from the two types of analyses are compared with each other and good agreement has been obtained. The Influences of variations in shell geometrical parameters, boundary condition, and changes in the cross stiffeners angle on the natural frequencies are studied. The results obtained are novel and can be used as a benchmark for further studies. The simplicity and the capability of the present method are also discussed. 1. Introduction Investigating the vibrational behavior of cylindrical shells (e.g., frequencies, mode shapes, and modal forces) is of high importance in structural dynamics. Cylindrical shells due to their high strength as well as light weight have gained many applications in the aviation and aerospace industries (e.g., launch vehicles, reentry vehicles, aircraft fuselages, spacecrafts, etc.) in particular. Great number of researches have been emerged rapidly in the past decades concerning with the vibrational analysis of composite cylindrical shells. An excellent review of researches in this area was collected by Leissa [1]. There are also some good reviews on vibration of composite shells using experimental [2, 3] and analytical methods [4–9] and numerical techniques [10–14]. Recently, Hemmatnezhad et al. [15] investigated the vibrational behavior of composite cylindrical shells using a unified analytical approach and based on different shell theories. Grid-stiffened cylinders are cylinders reinforced with different types of stiffening structures either on the inner, outer, or both sides of the shell. These stiffeners significantly increase the load resistance of a cylinder without much increase in weight. The selection of stiffener configuration depends on several factors such as the loading condition, cost, and other factors. The promising future of stiffened cylinders, with reinforcing grids or ribs, has led
Naked singularities in cylindrical collapse of counter-rotating dust shells  [PDF]
Brien C. Nolan
Physics , 2002, DOI: 10.1103/PhysRevD.65.104006
Abstract: Solutions describing the gravitational collapse of asymptotically flat cylindrical and prolate shells of (null) dust are shown to admit globally naked singularities.
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