scholarly journals Orthotropy as a driver for complex stability phenomena in cylindrical shell structures

2018 ◽  
Vol 198 ◽  
pp. 63-72 ◽  
Author(s):  
R.M.J. Groh ◽  
A. Pirrera
Keyword(s):  
Cylindrical Shell ◽  
Shell Structures ◽  
Complex Stability

Drastic tailorable thermal expansion chiral planar and cylindrical shell structures explored with finite element simulation

2019 ◽  
Vol 210 ◽  
pp. 327-338 ◽  
Author(s):  
Huabin Yu ◽  
Wenwang Wu ◽  
Jianxun Zhang ◽  
Jikun Chen ◽  
Haitao Liao ◽  
...  
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Thermal Expansion ◽  
Finite Element Simulation ◽  
Shell Structures ◽  
Element Simulation

The effects of ribs in axial compression of CFRP anisogrid cylindrical shell structures

2019 ◽  
Author(s):  
J. Anish Jafrin Thilak ◽  
P. Suresh ◽  
P. Balamurugan
Keyword(s):  
Cylindrical Shell ◽  
Axial Compression ◽  
Shell Structures

Experimental Study on Deformation and Shock Damage of Cylindrical Shell Structures Subjected to Underwater Explosion

2010 ◽  
Vol 224 (11) ◽  
pp. 2505-2514 ◽  
Author(s):  
L-J Li ◽  
W-K Jiang ◽  
Y-H Ai
Keyword(s):  
Cylindrical Shell ◽  
Underwater Explosion ◽  
Experimental Results ◽  
Dynamic Responses ◽  
Shell Structures ◽  
Security Evaluation ◽  
Wave Loading ◽  
Shell Models ◽  
Edge Cracks ◽  
Damage Condition

The security evaluation of some structures shocked by an underwater explosion (UNDEX) frequently plays a key role in some cases, and it is necessary to accurately predict the damage condition of the structure in an UNDEX environment. This study investigates the dynamic linear and non-linear responses and shock damages of two kinds of submerged cylindrical shell models exposed to underwater spherical trinitrotoluene (TNT) charge explosions in a circular lake. Two endplates and a middle plate are mounted on the cylindrical shells to provide support and to create two enclosed spaces. The two kinds of cylindrical shell models with the same geometry characteristics are unfilled and main hull sand-filled. Fifteen different tests are carried out by changing the TNT explosive weights of 1 and 2 kg, standoff distances ranging from 3 to 0.3 m, and two explosion positions. Measured experimental results are compared with each other, and some transformed data are obtained. A detailed discussion on experimental results shows that the dynamic responses and damage modes are much different, and the main hull sand-filled cylindrical shell is more difficult to be damaged by the shock wave loading than the unfilled model. Edge cracks are mainly observed at the instrument hull of the main hull sand-filled model, but surface tearing and cracks are observed on both the main hull and the instrumental hull of the unfilled model, respectively.

scholarly journals Wave scattering by infinite cylindrical shell structures submerged in a fluid medium

Wave Motion ◽  
2003 ◽  
Vol 38 (2) ◽  
pp. 131-149 ◽  
Author(s):  
L. Godinho ◽  
A. Tadeu ◽  
F.J. Branco
Keyword(s):  
Cylindrical Shell ◽  
Wave Scattering ◽  
Shell Structures ◽  
Fluid Medium ◽  
Infinite Cylindrical Shell

Dynamic Instability of a Cylindrical Shell Structure Subjected to Horizontal and Vertical Excitations Simultaneously

2004 ◽  
Author(s):  
Katsuhisa Fujita ◽  
Taisuke Nosaka ◽  
Tomohiro Ito
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Stability ◽  
Parametric Excitation ◽  
Dynamic Instability ◽  
Simulation Analysis ◽  
Seismic Analysis ◽  
Shell Structures ◽  
Analysis Method ◽  
Water Tanks ◽  
Vertical Excitations

Many structures such as support columns such as those for elevated expressways and towers tend to become larger and more flexible recently, thus the buckling or collapse of these structures is considered to easily occur than ever due to huge earthquakes. Actually, in the Hyogo-ken Nambu earthquake in Japan, buckling phenomena of tall support columns were observed every-where. Therefore, the evaluation technology on the dynamic stability is very important in order to ensure the seismic design reliability for these structures. The authors have ever studied the effects of the horizontal and vertical simultaneous excitations on the above-mentioned buckling phenomena of support columns experimentally. More-over, they also investigated the fundamental phenomena of the dynamic stability of the support columns subjected to the horizontal and vertical excitations simultaneously by numerical simulations using an analytical model where the support column is treated as a tall elastic cantilever beam. The purpose of this paper is on the dynamic instability, that is dynamic buckling, of a cylindrical shell structures such as those for elevated expressways, towers, containment vessels, LNG tanks and water tanks in various industrial plants so on subjected to horizontal and vertical excitations simultaneously. The coupled motion of equation with horizontal and vertical excitations simultaneously for these cylindrical shell structures is derived in this paper, and this modeling is shown to become a Mathieu type’s parametric excitation. The numerical simulation analysis is carried out for a cylindrical shell model with an attached mass on its tip. Comparing with the classical seismic analysis method, this proposed dynamic instability analysis method shows the larger deformation in horizontal direction due to the parametric excitation of the vertical seismic wave. As the results, the structures are apt to lose the structural stability more due to the coupling effects between the horizontal and vertical seismic simultaneous loadings.

scholarly journals The implosion of cylindrical shell structures in a high-pressure water environment

2013 ◽  
Vol 469 (2160) ◽  
pp. 20130443 ◽  
Author(s):  
C. M. Ikeda ◽  
J. Wilkerling ◽  
J. H. Duncan
Keyword(s):  
High Pressure ◽  
Cylindrical Shell ◽  
Time Scale ◽  
Water Pressure ◽  
Water Environment ◽  
Mode Number ◽  
Shell Structures ◽  
Internal Diameter ◽  
Cross Sectional ◽  
Pressure Water

The implosion of cylindrical shell structures in a high-pressure water environment is studied experimentally. The shell structures are made from thin-walled aluminium and brass tubes with circular cross sections and internal clearance-fit aluminium end caps. The structures are filled with air at atmospheric pressure. The implosions are created in a high-pressure tank with a nominal internal diameter of 1.77 m by raising the ambient water pressure slowly to a value, P c , just above the elastic stability limit of each shell structure. The implosion events are photographed with a high-speed digital movie camera, and the pressure waves are measured simultaneously with an array of underwater blast sensors. For the models with larger values of length-to-diameter ratio, L / D 0 , the tubes flatten during implosion with a two-lobe (mode 2) cross-sectional shape. In these cases, it is found that the pressure wave records scale primarily with P c and the time scale (where R i is the internal radius of the tube and ρ is the density of water), whereas the details of the structural design produce only secondary effects. In cases with smaller values of L / D 0 , the models implode with higher-mode cross-sectional shapes. Pressure signals are compared for various mode-number implosions of models with the same available energy, P c V , where V is the internal air-filled volume of the model. It is found that the pressure records scale well temporally with the time scale , but that the shape and amplitudes of the pressure records are strongly affected by the mode number.

scholarly journals Experimental and Numerical Determination of Critical Buckling Pressure of thin Cylindrical Shells Subjected To External Pressure

2020 ◽  
Vol 8 (6) ◽  
pp. 4362-4366
Keyword(s):  
Cylindrical Shell ◽  
Boundary Conditions ◽  
Measurement System ◽  
Pressure Measurement ◽  
Thin Shell ◽  
External Pressure ◽  
Shell Structures ◽  
Test Rig ◽  
Critical Buckling Pressure ◽  
Pressure Measurement System

Thin shell structures have very high load bearing capacity, hence find wide applications in the field of mechanical engineering, structural engineering, sea shore structures, aerospace industries and nuclear engineering structures. The major failure of thin shell structures is buckling. Oil carrying pipelines, hull structures, oil tankers are few examples in which thin cylindrical shell structures fails by buckling under external pressure loading. In order to avoid the buckling failure, prediction of critical buckling pressure is important in thin shell structures under external pressure. But this critical buckling pressure depends on boundary conditions, imperfections, thickness variation of shells etc. To estimate the effects of these parameters on Critical Buckling Pressure (CBP) require a reliable experimental test rig. Hence in our proposed work, efforts are taken to develop a simple cost-effective reliable test rig to determine the effects of these parameter variations on the critical buckling pressure. For developing the test rig two important components to be designed properly namely, external cover cylinder and online pressure measurement system. The external cover cylinder with lid which contains test cylindrical shell inside should be designed in such a way that it should be leak proof and rigid so as to withstand the internal working pressure with negligible deformations. Hence, a ring and stinger stiffened cylindrical shell is taken as external cylindrical shell. The pressure variation in the test rig should be recorded online so as to predict the critical buckling pressure accurately. Hence, PC interfaced microcontroller-based pressure measurement system is developed in our proposed work. The test cylinder considered for this work is made of mild steel of size diameter 456 mm, length 456 mm and thickness 1 mm. The classical (simply supported) boundary conditions are assumed and simulated on both sides of the test cylinders. The experimental critical buckling pressures are compared with the FE results and both the results have good agreement

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