AN APPROACH FOR ESTIMATING CRITICAL TEMPERATURES OF BUCLING OF SHALLOW CYLINDRICAL SHELLS

2019 ◽  
Vol 2019 (2) ◽  
pp. 270-274
Author(s):  
P Grigoriev ◽  
◽  
Sh Ibodulloev ◽  
B Poyonov
Keyword(s):  
Finite Element Method ◽  
Cylindrical Shell ◽  
Cylindrical Shells ◽  
The Finite Element Method ◽  
Passenger Cars ◽  
Critical Temperatures ◽  
Theoretical Justification ◽  
Climatic Zones ◽  
Shell Elements ◽  
Structural Solutions

An approach for defining critical temperatures of buckling for a pivotally resting plane cylindrical shell has been considered. Operation in various climatic zones leads to buckling of roof elements of passenger cars. In connection with that, it is necessary to have a theoretical justification of structural solutions taking into account critical temperatures of buckling of shell elements. The roof element of the passenger car should be classified as plane cylindrical shells. An expression for defining critical temperatures by the Bubnov-Galerkin method has been obtained, as well as the equations of plane cylindrical shells proposed by V.Z. Vlasov. The results calculated with the derived expression have been verified by comparison with those obtained by the finite element method (FEM). This comparison has demonstrated satisfactory agreement of these results.

Creep Buckling Analyses of Circular Cylindrical Shells Under Axial Compression—Bifurcation Buckling Analysis by the Finite Element Method

1987 ◽  
Vol 109 (2) ◽  
pp. 179-183 ◽  
Author(s):  
N. Miyazaki
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Axial Compression ◽  
Circular Cylindrical Shell ◽  
Cylindrical Shells ◽  
The Finite Element Method ◽  
Bifurcation Buckling ◽  
Creep Buckling ◽  
Circular Cylindrical Shells

The finite element method is applied to the creep buckling of circular cylindrical shells under axial compression. Not only the axisymmetric mode but also the bifurcation mode of the creep buckling are considered in the analysis. The critical time for creep buckling is defined as either the time when a slope of a displacement versus time curve becomes infinite or the time when the bifurcation buckling occurs. The creep buckling analyses are carried out for an infinitely long and axially compressed circular cylindrical shell with an axisymmetric initial imperfection and for a finitely long and axially compressed circular cylindrical shell. The numerical results are compared with available analytical ones and experimental data.

scholarly journals Calculation of the goffered multilayered composite cylindrical shells by using the finite element method

1999 ◽  
Vol 21 (2) ◽  
pp. 116-128
Author(s):  
Pham Thi Toan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Cylindrical Shells ◽  
The Finite Element Method ◽  
Multilayered Composite ◽  
Internal Forces ◽  
External Loads ◽  
Element Method ◽  
Composite Cylindrical Shells

In the present paper, the goffered multilayered composite cylindrical shells is directly calculated by finite element method. Numerical results on displacements, internal forces and moments are obtained for various kinds of external loads and different boundary conditions.

scholarly journals Sensitivity of Composite Structure with Directional Properties of Annular Three-Layered Plate Mechanically and Thermally Loaded

2020 ◽  
Vol 22 (3) ◽  
pp. 691-702
Author(s):  
Dorota Pawlus
Keyword(s):  
Finite Element Method ◽  
Material Properties ◽  
Radial Direction ◽  
Layered Plate ◽  
The Finite Element Method ◽  
Critical Temperatures ◽  
Buckling Modes ◽  
Numerical Investigations ◽  
Plate Structure ◽  
Annular Plates

AbstractPaper presents the sensitivity of the three-layered plate structure on the acting of mechanical and thermal loads. The cases of the annular plates, whose individual layers: facings and core have homogeneous building and/or heterogeneous one expressed by the variable material properties in radial direction have been examined. Numerical investigations have been carried out modelling the select examples of plate structure with the use of the finite element method. Plate is loaded in the plane of facings or is subjected to the flat temperature field. The evaluation of the structure sensitivity has been carried out analysing the values of critical loads or critical temperatures and corresponding with them buckling modes. Numerous results presented in diagrams create the image of plate behaviours, show responses of plate structure and indicate on the means of structure designs, which can fulfil the expected conditions of plate work.

scholarly journals The study of deformations of the soil mass at construction of underground structures with advanced anchoring

2019 ◽  
Vol 265 ◽  
pp. 04016
Author(s):  
Sergey Stradanchenko ◽  
Stanislav Maslennikov ◽  
Vladimir Dmitrienko ◽  
Irina Kokunko ◽  
Yuri Chertov
Keyword(s):  
Finite Element Method ◽  
Negative Impact ◽  
Soil Mass ◽  
Underground Space ◽  
The Finite Element Method ◽  
Underground Structures ◽  
Bottom Hole ◽  
The Stability ◽  
Structural Solutions ◽  
Protective Screen

The development of underground space has a negative impact on the state of objects on the surface. The search of effective ways to prevent deformation of the soil mass has not lost its relevance. The study focuses on advanced anchoring. Based on the analysis of the technological and structural solutions for the construction of the dismantling chamber No. 1 of the Kalininsko-Solntsevskaya line of the Moscow Metro, and studies of stress-strain states of the marginal rock mass in the bottom hole zone by using the finite element method, the measures to ensure the stability of the surrounding rocks and the protective screen of the chamber were considered. The simulation of the stress state of the rock massif shows the weaknesses in the operation of the structures, so the solutions for reducing the surface shrinkage during hardening of the array by advanced anchoring were proposed.

Burst Analysis of Cylindrical Shells

2008 ◽  
Vol 130 (1) ◽  
Author(s):  
Liping Xue ◽  
G. E. O. Widera ◽  
Zhifu Sang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Cylindrical Shells ◽  
Three Dimensional ◽  
Computer Software ◽  
Finite Element Method Simulation ◽  
Material Behavior ◽  
Burst Pressure ◽  
Element Method

The purpose of this paper is to demonstrate that the burst pressure of a cylindrical shell subjected to internal pressure can be accurately predicted by using finite element method. The computer software ANSYS (Swanson Analysis System Inc., 2003, “Engineering Analysis Systems User's Manual”) is employed to perform a static, nonlinear analysis (both geometry of deformation and material behavior) using three-dimensional 20 node structural solid elements. The “Newton–Raphson method” and the “arclength method” are both employed to solve the nonlinear equations. A comparison with various empirical equations shows that the static finite element method simulation using the arclength method can be employed with sufficient accuracy to predict the burst pressure of a cylindrical shell. It is also shown that the Barlow equation is a good predictor of burst pressure of cylindrical shells.

Stress Concentration Factors of Cross-Bores in Thick Walled Cylinders and Blocks

2004 ◽  
Vol 126 (2) ◽  
pp. 184-187 ◽  
Author(s):  
Ricky D. Dixon ◽  
Daniel T. Peters ◽  
Jan G. M. Keltjens
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Cylindrical Shells ◽  
Ease Of Use ◽  
Stress Fields ◽  
The Finite Element Method ◽  
Internal Radius ◽  
Concentration Factors ◽  
Stress Concentration Factors

The purpose of this paper is to investigate the stress concentration in stress fields around crossbores for closed-end thick-walled square blocks and cylindrical shells using the finite element method. These stress concentration factors are presented and discussed as a function of the ratio of crossbore radius to the cylinder internal radius (HR/Ri=0.01 to 0.7) for a range of wall ratios (Y=1.5 to 5). Charts and simple expressions are provided for ease of use.

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