Stress Analysis of Ellipsoidal Shell With Nozzle Under Internal Pressure Loading

1994 ◽  
Vol 116 (4) ◽  
pp. 431-436 ◽  
Author(s):  
V. N. Skopinsky ◽  
N. A. Berkov
Keyword(s):  
Internal Pressure ◽  
Stress Analysis ◽  
Shell Theory ◽  
Numerical Procedure ◽  
Graphical Form ◽  
Pressure Loading ◽  
Ellipsoidal Shell ◽  
Thin Shell Theory ◽  
Purpose Computer ◽  
Special Purpose Computer

This paper presents the numerical procedure for the stress analysis of the intersecting shells consisting of an ellipsoidal shell and nozzle. Thin shell theory and finite element method are used. The developed special-purpose computer program SAIS is employed for elastic stress analysis of the model joints of the ellipsoidal shell with nozzle. The parametric study of the joints under internal pressure loading was performed. The results are presented in graphical form. Nondimensional geometric parameters are considered to analyze the effects of changing these parameters on the maximum effective stresses in the shells.

Stress Analysis of Shell Intersections With Torus Transition Under Internal Pressure Loading

1997 ◽  
Vol 119 (3) ◽  
pp. 288-292 ◽  
Author(s):  
V. N. Skopinsky
Keyword(s):  
Internal Pressure ◽  
Stress Analysis ◽  
Graphical Form ◽  
Pressure Loading ◽  
Stress Ratios ◽  
Shell Intersections ◽  
Thin Shell Theory ◽  
Purpose Computer ◽  
Radial Nozzle ◽  
Special Purpose Computer

Thin shell theory and finite element method were used to investigate shell intersections with torus transition. The developed special-purpose computer program SAIS is employed for elastic stress analysis of the shell intersections. Comparison of calculated results with experimental data are presented. The parametric study of models for the radial nozzle connections in shells under internal pressure loading was performed. The results are presented in graphical form. Nondimensional geometric parameters are considered to analyze the effects of changing these parameters on stress ratios in the shell intersections.

Numerical Stress Analysis of Intersecting Cylindrical Shells

1993 ◽  
Vol 115 (3) ◽  
pp. 275-282 ◽  
Author(s):  
V. N. Skopinsky
Keyword(s):  
Internal Pressure ◽  
Stress Analysis ◽  
Elastic Stress ◽  
Cylindrical Shells ◽  
Numerical Approach ◽  
The Finite Element Method ◽  
Pressure Loading ◽  
Purpose Computer ◽  
Special Purpose Computer

This paper presents the numerical approach for the stress analysis of the intersecting shells. For a systematic study of this problem, the classification of the model joints is introduced. Stress analysis has been made with the application of the finite element method based on the modified mixed formulation. The developed special-purpose computer program SAIS is used for elastic stress analysis of the model joints of the intersecting shells. Comparison of the calculated and experimental results for ORNL-1 model are presented for internal pressure and moment loadings. The parametric study of the model joints of the intersecting cylindrical shells under internal pressure loading was performed. The presented results show the effects of changing various geometric and angular parameters on the maximum effective stresses in the shells.

Approximate Elastic Stresses in Pipe Junctions with Chamfer Corners

1981 ◽  
Vol 103 (1) ◽  
pp. 107-111
Author(s):  
D. P. Updike
Keyword(s):  
Internal Pressure ◽  
Stress Analysis ◽  
Elastic Stress ◽  
Branch Pipe ◽  
Optimum Size ◽  
Pressure Loading ◽  
Elastic Stresses ◽  
Rapid Calculation ◽  
Identical Diameter

Elastic stress analysis of a right angle tee branch pipe connection of two pipes of identical diameter and thickness connected through 45-deg chamfer corner sections is developed for internal pressure loading. Stresses in the crotch portion of the vessel are determined. These results are presented in the form of a table of factors useful for rapid calculation of approximate values of the peak stresses. The existence of a structurally optimum size of chamfer is demonstrated.

Stress Analysis of Mitred Bends by Ring Elements

1984 ◽  
Vol 106 (1) ◽  
pp. 54-62 ◽  
Author(s):  
O. Watanabe ◽  
H. Ohtsubo
Keyword(s):  
Stress Analysis ◽  
Degrees Of Freedom ◽  
Shell Theory ◽  
Trigonometric Functions ◽  
Shape Functions ◽  
Straight Pipe ◽  
Shell Elements ◽  
Hermitian Polynomials ◽  
Ring Elements ◽  
Thin Shell Theory

This paper proposes a ring element for the stress analysis of mitred bends, which is an extension of ring elements for pipe bends proposed by the present authors. Since accurate treatments of continuity conditions on the connecting lines between straight pipe segments are employed and strain-displacement relations derived from the general thin shell theory with shear strains are considered, the present method can be applied to problems of mitred bends of complex configurations under general loading conditions. Shape functions are developed by trigonometric functions and Hermitian polynomials of second order in the circumferential and longitudinal directions, respectively. This finite element method requires fewer number of degrees of freedom for the same accuracy than the conventional shell elements.

The Shrink-Fit of a Cylindrical Shell Onto a Discontinuous Rigid Mandrel

1974 ◽  
Vol 41 (4) ◽  
pp. 959-962 ◽  
Author(s):  
D. B. Bogy
Keyword(s):  
Thin Shell ◽  
Shell Theory ◽  
Numerical Results ◽  
Graphical Form ◽  
Tabular Form ◽  
Arbitrary Length ◽  
Axisymmetric Contact Problem ◽  
Shrink Fit ◽  
Limiting Case ◽  
Thin Shell Theory

This axisymmetric contact problem is solved using Kirchhoff-Love thin shell theory for a mandrel with a gap and for a plug, either of arbitrary length. The limiting case of a very long gap is of particular significance and is also solved. Representative numerical results are presented in graphical form and sufficient numerical results are presented in tabular form to permit easy computation of any desired aspect of the solution.

A Finite Element Model to Analyze Cylinder-Cylinder Intersections

1987 ◽  
Vol 109 (4) ◽  
pp. 411-420 ◽  
Author(s):  
R. Natarajan ◽  
G. E. O. Widera ◽  
P. Afshari
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Finite Element Model ◽  
Internal Pressure ◽  
Pressure Vessel ◽  
Shell Theory ◽  
Element Model ◽  
Pressure Loading

A finite element model is proposed to study the stresses in the neighborhood of a cylinder-cylinder intersection. In particular, diameter ratios greater than 0.5 are focused upon since little information is available in the ASME Boiler and Pressure Vessel Code or in the literature about the stress concentration for these geometries. The aim of the present work is to validate such a model for internal pressure loading. To accomplish this, various parametric finite element studies were conducted. The selected model is then validated by applying it to various available cylinder intersection models and comparing the results. The finite element results are further compared with a solution obtained using a shell theory.

The Method of Design by Analysis for Cylindrical Pressure Vessels with Spherically Dished Head

2019 ◽  
Vol 795 ◽  
pp. 262-267
Author(s):  
Zhen Yu Wang ◽  
Jian Wu ◽  
Ming De Xue ◽  
Shi Yu Li
Keyword(s):  
Internal Pressure ◽  
Shell Theory ◽  
Pressure Vessels ◽  
Design Criteria ◽  
Analysis Method ◽  
Perfectly Plastic ◽  
Elastic Perfectly Plastic ◽  
Nonlinear Elastic ◽  
Theoretical Stress ◽  
Thin Shell Theory

Standards GB 150.3-2011 and JB4732-1995 (Confirmed in 2005) provide design methods for the cylindrical pressure vessels with spherically dished head under internal pressure. It is available for the ratio of the internal pressure p to the allowable stress Sm, p/Sm≥0.002. Engineers desire the design curves for p/Sm<0.002. This paper presents a stress analysis method based on elastic thin shell theory for a spherically dished head jointed to the end or the middle of the cylindrical shell. The design criteria in the current standards are modified. Based on the theoretical stress solution and design criteria, the suitable range of the design curves is extended to p/Sm≥0.001. Nonlinear elastic perfectly-plastic finite element method ensures the reliability of the design curves.

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