Stability of a compound shell of revolution under external pressure

1987 ◽  
Vol 23 (7) ◽  
pp. 631-635
Author(s):  
V. V. Gaidaichuk ◽  
E. A. Gotsulyak ◽  
V. I. Gulyaev ◽  
T. A. Savchenko
Keyword(s):  
External Pressure ◽  
Shell Of Revolution ◽  
Compound Shell ◽  
Compound Shell Of Revolution

Instability of Cup-Cylinder Compound Shell Under Uniform External Pressure

1995 ◽  
Vol 39 (02) ◽  
pp. 160-165
Author(s):  
Raisuddin Khan ◽  
Wahhaj Uddin
Keyword(s):  
Critical Pressure ◽  
Nonlinear Differential Equations ◽  
External Pressure ◽  
Shells Of Revolution ◽  
Membrane Stress ◽  
Spherical Shells ◽  
Uniform External Pressure ◽  
Shell Buckling ◽  
Compound Shell ◽  
Method Of Solution

Instability of compound cup-end cylindrical shells under uniform external pressure is studied. Nonlinear differential equations governing the large axisymmetric deformations of shells of revolution which ensure the unique states of lowest potential energy of the shells under a given pressure are solved. The method of solution is multisegment integration, developed by Kalnins and Lestingi, for predicting the mode of buckling and the critical pressure of these compound shells. Results show that, when simple cylindrical and spherical shells which develop the same membrane stress under pressure are used as a compound cup-end cylindrical shell, buckling takes place in the cylinder portion, near the cup-cylinder junction, at loads a few times higher than the buckling load of conventional dome-cylinder shells.

Study of the stress-strain state of the ribbed shell of revolution under external pressure

1979 ◽  
Vol 11 (5) ◽  
pp. 456-460
Author(s):  
G. V. Isakhanov ◽  
A. I. Gulyar ◽  
A. L. Kozak ◽  
Yu. M. Rodichev ◽  
A. S. Sakharov
Keyword(s):  
Strain State ◽  
External Pressure ◽  
Shell Of Revolution ◽  
Stress Strain ◽  
Stress Strain State ◽  
Ribbed Shell

scholarly journals Low Frequency Sloshing Analysis of Cylindrical Containers with Flat and Conical Baffles

2017 ◽  
Vol 22 (4) ◽  
pp. 867-881 ◽  
Author(s):  
V. Gnitko ◽  
Y. Naumemko ◽  
E. Strelnikova
Keyword(s):  
Velocity Potential ◽  
Boundary Integral Equations ◽  
Low Frequency ◽  
Boundary Integral ◽  
Boundary Element Methods ◽  
Singular Boundary ◽  
Circular Plates ◽  
Compound Shell ◽  
Container Model ◽  
Compound Shell Of Revolution

Abstract This paper presents an analysis of low-frequency liquid vibrations in rigid partially filled containers with baffles. The liquid is supposed to be an ideal and incompressible one and its flow is irrotational. A compound shell of revolution is considered as the container model. For evaluating the velocity potential the system of singular boundary integral equations has been obtained. The single-domain and multi-domain reduced boundary element methods have been used for its numerical solution. The numerical simulation is performed to validate the proposed method and to estimate the sloshing frequencies and modes of fluid-filled cylindrical shells with baffles in the forms of circular plates and truncated cones. Both axisymmetric and non-axisymmetric modes of liquid vibrations in baffled and un-baffled tanks have been considered. The proposed method makes it possible to determine a suitable place with a proper height for installing baffles in tanks by using the numerical experiment.

Trust: A National Project

2015 ◽  
pp. 138-146
Author(s):  
N. Rozinskaya ◽  
I. Rozinskiy
Keyword(s):  
Social Capital ◽  
Civil Society ◽  
Everyday Life ◽  
Western Europe ◽  
External Pressure ◽  
National Project ◽  
Low Level ◽  
General Trust

This article deals with the genesis of general trust and social capital in contemporary Russia, which faces the external pressure. The low level of general trust is noted, its economic, social and everyday life implications are considered, an explanation of Russia’s lower than in western Europe level of trust is provided. Considering society’s level of trust and social capital as externalia, the authors conclude that there is a necessity to "produce" trust intentionally. Promotion of collective charity is proposed as a mechanism of such "production". It is stressed that in order to activate the potential of trust in a society, there is a need for ideological and symbolic basis linked to its history. Russian People’s Unity Day, understood as the birthday of Russian civil society, is proposed to be used in this respect.

Collapse of elliptic cylinders under uniform external pressure

1971 ◽  
Author(s):  
F. BROGAN
Keyword(s):  
External Pressure ◽  
Uniform External Pressure

Dynamic Characteristics of a Large Underwater Shell of Revolution (1st Report)

1994 ◽  
Vol 1994 (175) ◽  
pp. 325-336
Author(s):  
Yukitaka Yasuzawa ◽  
Hiroyuki Takahashi
Keyword(s):  
Dynamic Characteristics ◽  
Shell Of Revolution

Under Pressure: Mechanochemical Effects on Structure and Ion Conduction in the Sodium-Ion Solid Electrolyte Na3PS4

2020 ◽  
Author(s):  
Theodosios Famprikis ◽  
O. Ulas Kudu ◽  
James Dawson ◽  
Pieremanuele Canepa ◽  
François Fauth ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Mechanochemical Synthesis ◽  
Activation Volume ◽  
External Pressure ◽  
Sodium Ion ◽  
Variable Pressure ◽  
Ion Conductor ◽  
Ceramic Synthesis ◽  
Solid State Batteries ◽  
Fast Ion

<div> <p>Fast-ion conductors are critical to the development of solid-state batteries. The effects of mechanochemical synthesis that lead to increased ionic conductivity in an archetypical sodium-ion conductor Na<sub>3</sub>PS<sub>4</sub> are not fully understood. We present here a comprehensive analysis based on diffraction (Bragg, pair distribution function), spectroscopy (impedance, Raman, NMR, INS) and <i>ab-initio</i> simulations aimed at elucidating the synthesis-property relationships in Na<sub>3</sub>PS<sub>4</sub>. We consolidate previously reported interpretations about the local structure of ball-milled samples, underlining the sodium disorder and showing that a local tetragonal framework more accurately describes the structure than the originally proposed cubic one. Through variable-pressure impedance spectroscopy measurements, we report for the first time the activation volume for Na<sup>+</sup> migration in Na<sub>3</sub>PS<sub>4</sub>, which is ~30% higher for the ball-milled samples. Moreover, we show that the effect of ball-milling on increasing the ionic conductivity of Na<sub>3</sub>PS<sub>4</sub> to ~10<sup>-4</sup> S/cm can be reproduced by applying external pressure on a sample from conventional high temperature ceramic synthesis. We conclude that the key effects of mechanochemical synthesis on the properties of solid electrolytes can be analyzed and understood in terms of pressure, strain and activation volume.</p> </div>

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