Stress Analysis of Reinforced Nozzle-Cylindrical Shell Intersection Under Internal Pressure or Nozzle Radial Thermal Expansion

1988 ◽  
Vol 110 (4) ◽  
pp. 367-373 ◽  
Author(s):  
A. Y. Kuo ◽  
T. Y. Hsu
Keyword(s):  
Finite Element ◽  
Cylindrical Shell ◽  
Thermal Expansion ◽  
Internal Pressure ◽  
Numerical Solution ◽  
Analytical Method ◽  
Computer Code ◽  
Internal Pressures ◽  
Pressurized Cylinder ◽  
Insert Plate

Two normally intersecting cylinders under different internal pressures in each of the cylinders is solved analytically. The inclusion of nozzle fillet, insert plate and inner nozzle broadens the applicability of this analytical method in the design and analysis of pressurized cylinder-to-cylinder intersection. The current numerical solution scheme has been incorporated in the computer code NUTSHELL. Comparisons of NUTSHELL solutions and experimental or finite element results have also been presented.

Determination of critical angle of circumferential throughwall crack for structurally distorted 90° pipe bends under bending moment with and without internal pressure

2017 ◽  
Vol 233 (5) ◽  
pp. 817-830 ◽  
Author(s):  
S Sumesh ◽  
AR Veerappan ◽  
S Shanmugam
Keyword(s):  
Finite Element ◽  
Internal Pressure ◽  
Closed Form ◽  
Bending Moment ◽  
External Loading ◽  
Element Analysis ◽  
Critical Crack ◽  
Structural Distortions ◽  
Internal Pressures

Throughwall circumferential cracks (TWC) in elbows can considerably minimize its collapse load when subjected to in-plane bending moment. The existing closed-form collapse moment equations do not adequately quantify critical crack angles for structurally distorted cracked pipe bends subjected to external loading. Therefore, the present study has been conducted to examine utilizing elastic-plastic finite element analysis, the influence of structural distortions on the variation of critical TWC of 90° pipe bends under in-plane closing bending moment without and with internal pressure. With a mean radius ( r) of 50 mm, cracked pipe bends were modeled for three different wall thickness, t (for pipe ratios of r/ t = 5,10,20), each with two different bend radius, R (for bend ratios of R/r = 2,3) and with varying degrees of ovality and thinning (0 to 20% with increments of 5%). Finite element analyses were performed for two loading cases namely pure in-plane closing moment and in-plane closing bending with internal pressure. Normalized internal pressures of 0.2, 0.4, and 0.6 were applied. Results indicate the modification in the critical crack angle due to the pronounced effect of ovality compared to thinning on the plastic loads of pipe bends. From the finite element results, improved closed-form equations are proposed to evaluate plastic collapse moment of throughwall circumferential cracked pipe bends under the two loading conditions.

Reliability Analysis of Wear Casing Internal Pressure Strength

2013 ◽  
Vol 652-654 ◽  
pp. 1362-1366 ◽  
Author(s):  
Xian Yong Zhang ◽  
Jin Feng
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Monte Carlo ◽  
Internal Pressure ◽  
Reliability Analysis ◽  
Safety Evaluation ◽  
Steel Grade ◽  
Wear Depth ◽  
P110 Steel ◽  
Internal Pressures

Reliability of eccentric wear casing was studied by Monte-Carlo and finite element method. In different internal pressures, calculated reliability of P110 steel grade 9 5/8 inches casing with wear depth less than 0.5 times wall thickness. The influence of different cement ring circumferential missing amount and stratum pressures on wear casing reliability were presented. The results provide basis for casing safety evaluation and reasonable replacement.

Ballooning Deformation of Zircaloy-4 Fuel Sheath

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Mohd. Kaleem Khan ◽  
Manabendra Pathak
Keyword(s):  
Internal Pressure ◽  
Parametric Study ◽  
Circumferential Strain ◽  
Experimental Studies ◽  
Computer Code ◽  
Inert Atmosphere ◽  
Experimental Setup ◽  
Heating Rates ◽  
Clad Tube ◽  
Internal Pressures

In this paper, both experimental and analytical investigations have been conducted to investigate the fuel sheath (also known as clad tube) ballooning deformation and subsequent bursting. The work has been performed to simulate ballooning deformation of fuel sheaths under different heating rates and internal pressures in an inert atmosphere. An experimental setup has been designed to capture the temperature, pressure, and wall displacement data during the ballooning deformation of the sheath specimen. Also, a computer code in MATLAB has been developed to compute the stresses and strains at the ballooning site of the fuel sheath. The developed model has been validated with present and past experimental studies. A parametric study has also been conducted to study the effect of internal pressure, heating rate, and sheath dimensions on hoop or circumferential strain.

scholarly journals Solution of the axisymmetric problem of thermoelasticity of a radially inhomogeneous cylindrical shell by numerical-analytical method and the finite element method

2019 ◽  
Vol 15 (4) ◽  
pp. 323-326
Author(s):  
Lyudmila S. Polyakova ◽  
Vladimir I. Andreev
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Analytical Method ◽  
Software Package ◽  
Method Of Successive Approximations ◽  
Infinite Cylinder ◽  
The Finite Element Method ◽  
Numerical Analytical Method ◽  
Element Method

The aim of research is to compare two calculation methods using the example of solving the axisymmetric thermoelasticity problem. Methods. The calculation of a thick-walled cylindrical shell on the temperature effect was carried out by the numerical-analytical method and the finite element method, implemented in the LIRA-CAD software package. The shell consists of three layers: two layers of heat-resistant concrete and an outer steel layer. In the calculation, a piecewise linear inhomogeneity of the shell due to its three-layer structure and continuous inhomogeneity caused by the influence of a stationary temperature field is taken into account. The numerical-analytical method of calculation involves the derivation of a resolving differential equation, which is solved by the sweep method, it is possible to take into account the nonlinear nature of the deformation of the material using the method of successive approximations. To solve this problem by the finite element method, a similar computational model of the shell was constructed in the LIRA-CAD software package. The solution of the problem of thermoelasticity for an infinite cylinder (under conditions of a plane deformed state) and for a cylinder of finite length with free ends is given. Results . Comparison of the calculation results is carried out according to the obtained values of ring stresses σθ.

Static and Dynamic Burst Analysis of Cylindrical Shells

2006 ◽  
Author(s):  
Liping Xue ◽  
Cunjiang Cheng ◽  
G. E. O. Widera ◽  
Zhifu Sang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Three Dimensional ◽  
Element Model ◽  
Computer Code ◽  
Material Behavior ◽  
Burst Pressure ◽  
Implicit Methods ◽  
Element Method

The purpose of this paper is to determine whether the finite element method can be employed to accurately predict the burst pressure of a specific cylindrical shell subjected to internal pressure. Both static and dynamic analyses were carried out. The computer code ANSYS 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” (N-R method) and the “Arc-Length Method”, are both employed to solve the nonlinear equations. The finite element code LS-DYNA is used to generate a three-dimensional finite element model by use of eight-node brick elements for the dynamic analysis. Both explicit and implicit methods are used to simulate the dynamic response of cylinders. A comparison with various empirical equations shows that both static and dynamic finite element method simulations can be employed with sufficient accuracy to predict the burst pressure of a specific cylindrical shell.

Vibration of the Rotor Shell in a Trochoidal-Type Machine Without Apex Seals

1998 ◽  
Author(s):  
Shuangqing Li ◽  
John B. Shung ◽  
Randall F. Barron
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Dynamic Response ◽  
Analytical Method ◽  
Natural Frequencies ◽  
Mode Shapes ◽  
Type Machine ◽  
Element Method

Abstract The natural frequencies and dynamic response of a trochoidal cylindrical shell in a trochoidal-type machine are studied. Both analytical method and finite element method (FEM) solutions are obtained. The mode shapes obtained by the two approaches match quite well. The model established can be applied to control the running clearance between rotor and chamber in this type of machine, which is critical to the performance of the machine.

Reference Stress Values for Toroidal Vessels Subjected to Uniform Internal Pressure

2004 ◽  
Author(s):  
Khosrow Zarrabi ◽  
Abheek Basu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Explicit Expression ◽  
The Finite Element Method ◽  
Creep Life ◽  
Reference Stress ◽  
Uniaxial Creep ◽  
Rupture Data ◽  
Internal Pressures

Using the finite element method, the paper presents an explicit expression for the reference stress of tube/pipe bends with various degrees of ovality that are subjected to uniform internal pressures. No such task has been accomplished before. The presented reference stress may be used in conjunction with the uniaxial creep rupture data to obtain the creep life of the bend.

The Influence of “Shell Behavior” on Load Distribution for Thin-Walled Conical Joints

1999 ◽  
Vol 67 (2) ◽  
pp. 298-306 ◽  
Author(s):  
L. Bruschelli ◽  
V. Latorrata
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Numerical Solution ◽  
Analytical Method ◽  
Load Distribution ◽  
Threaded Connections ◽  
Pipe Joints ◽  
Thin Walled ◽  
Boundary Geometry ◽  
Comparative Results

This article presents a new analytical method with a numerical solution to calculate load distribution in threaded connections. Our departure model was that suggested by D. G. Sopwith who has proposed the most recent and most tested theory. Our research consists in the introduction of conicity and, above all, in the development of the influence of boundary geometry (i.e. the nonthreaded section) on load distribution. Pipe joints are analyzed in special detail, supplying us with useful finite element method comparative results. [S0021-8936(00)02002-X]

Deformation Characteristics of Pipe Flanges Due to Bolt Loads and Internal Pressure

2009 ◽  
Author(s):  
Takashi Kobayashi ◽  
Kota Hamano ◽  
Tsutomu Kikuchi ◽  
Toshiyuki Sawa ◽  
Satoshi Nagata
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Pressure ◽  
Analytical Method ◽  
Visual Basic ◽  
Deformation Characteristics ◽  
Strength Of Materials ◽  
Japanese Industrial Standard ◽  
Visual Basic For Applications ◽  
Stress And Deformation

Deformation characteristics of pipe flanges are important in the leak rate based design of gasketed flanged connections. Not only the equilibrium of force between bolts and the clamped parts including flanges and a gasket but also the displacement between them should be considered in the design of gasketed flanged connections. Recently, finite element method (FEM) has widely been used in the analysis of flanged connections. However, analyses of pipe flanges based on the analytical method using classical theories such as the strength of materials are still important when parametric calculations of flanges are necessary. In this study, a method to analyze the stress and deformation of welding neck type flanges is demonstrated and the validity of the analysis is checked by experiment. A software using Visual Basic for Applications (VBA) is developed based on the method. The advantages of the software are that stresses and deformation of flanges are easily calculated by selecting a flange size and design conditions from a database. The validity of the results obtained by the software is also confirmed by comparing the calculated results with those obtained by FEA. A series of calculations have been done for Japanese Industrial Standard (JIS) flanges and the deformation characteristics are clarified when a flange is subjected to bolt loads and an internal pressure.

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