Analysis Of Cylindrical Pressure Vessels Research Articles

Analysis of cylindrical pressure vessels with dissimilar ends and material comparison

The current work deals with the methodological study of pressure vessel (Cylindrical or spherical) with different ends or heads. The pressure vessel is designed for 24 L volume and 8 bar pressure vessels are done following ASME standard section VIII, Division I. The thickness of all cylindrical heads is calculated by different formulae and the thickness vary accordingly. However, in this project, the thickness is kept constant irrespective of cylindrical heads or ends to study its effect. FEA is performed to evaluate or study the stress parameters. The software took for Finite Element Analysis (FEA) in Ansys 19.2. Before that, the 3D modelling was done using SolidWorks software. After concluding the better cylindrical end or head for constant thickness, the comparison of the material is made to compare with the current state of the art and find out the better material by analyzing the circumferential stress and longitudinal stress.

Design-Focused Stress Analysis of Cylindrical Pressure Vessels Intersected by Small-Diameter Nozzles

In a related work previously carried out by the authors, finite element analysis of cylindrical vessel–cylindrical nozzle juncture based on the use of thin shell theory, due to the fact that the intersecting nozzle sizes are moderate to large, have been presented. Such analysis becomes invalid in cases when the nozzles are small in sizes which may result in nozzles whose configuration violates the validity of shell assumption. As a result, use of solid elements (based on theory of elasticity) in modeling the cylindrical vessels with small-diameter nozzles is presented in the present paper. Discussions of the numerical experiments and the results achieved are, first, given. The results are then compared with the prediction by other models reported in the literature. In order to arrive at the overall design charts that cover all the possible ranges of nozzle-to-vessel diameter ratio, the charts for the vessels with moderate-to-large-diameter nozzles are augmented with those of cylindrical vessels intersected by small-diameter nozzles developed in this work.

Plastic Limit Load Analysis of Cylindrical Pressure Vessels with Different Nozzle Inclination

Sudden change in geometry of pressure vessel due to nozzle cutout, leads to local stress concentration and deformation, decreasing its strength. Elastic plastic analysis of cylindrical pressure vessels with different inclination angles of nozzle is important to estimate plastic limit load. In the present study, cylindrical pressure vessels with combined inclination of nozzles (i.e. in longitudinal and radial plane) are considered for elastic plastic limit load analysis. Three dimensional static nonlinear finite element analyses of cylindrical pressure vessels with nozzle are performed for incremental pressure loading. The von Mises stress distribution on pressure vessel shows higher stress zones at shell–nozzle junction. Approximate plastic limit load is obtained by twice elastic slope method. Variation in limit pressure with different combined inclination angle of nozzle is analyzed and found to be distinct in nature. Reported results can be helpful in optimizing pressure vessel design.

Finite element analysis of cylindrical pressure vessels having a misalignment in a circumferential joint

Finite element analysis (FEA) has been carried out to obtain the elastic stress distribution at cylinder-to-cylinder junction in pressurized shell structures that have applications in space – vehicle design. To validate the finite element modeling and analysis results, three joint configurations, (viz., unfilleted butt joint with equal thickness, unfilleted butt joint with unequal thickness and filleted butt joint with equal thickness) having test results in open literature were considered. The peak stress values for these configurations obtained from FEA are close to that of test results. The peak stress value is found to reduce due to filleted butt joint as expected and also confirmed through test results.

심해용 무인잠수정의 내압용기 구조설계

This paper presents the structural analysis of the pressure vessels in the unmanned underwater vehicle (UUV) under developing at KORDi, which consists of a ROV, an AUV and a launcher at 6000 m depth in the ocean. Analytical, linear and nonlinear stress and buckling analysis of cylindrical pressure vessels using FEM (ANSYS) are performed to verify the safety of the current design.

Fracture analysis of thick-wall cylinder pressure vessels

Fracture mechanics analysis of cylindrical pressure vessels is described in a brief fracture case study. Also included are additional examples of crack growth in pressure vessels and cannons. The case study is of an early brittle failure and subsequent redesign of a cannon tube. Fracture mechanics test methods are described which were developed specifically for testing of cylindrical geometries. Three examples of current fracture analysis of cylindrical pressure vessels are presented. Fast fracture of a vessel is described, including effects of tension residual stress and crack shape. Evidence of environmentally assisted fracture of a cannon tube is presented. Fatigue crack growth and life calculation methods for cylindrical pressure vessels are discussed including effects of compressive residual stress due to overstrain.

Elasto-plastic analyses of cylindrical pressure vessels with reversed dished ends

Finite element stress analyses are presented which allow for elastic and elasto-plastic material behaviour for axisymmetric problems of pressure vessels using isoparametric quadrilateral elements with linear, parabolic and cubic displacements. The traditional method of analysis and design of cylindrical pressure vessels with reversed dished ends is based on the well known British Standard BS 5500 Code. 1 The stresses and displacements, especially at and near the junctions, are of great interest to designers. In view of the immense usefulness of such containers, a detailed post yield study has been made based on the stress-strain idealisation for isotropic strain hardening materials—H′= 0·0047E and Von Mises and Tresca yield criteria. The basis for the prediction of load increment sizes for the elasto-plastic analysis and the upper bound for collapse pressure are presented, as well as the excessive deformation and shakedown criteria suitable for the design of reversed dished end containers.

Elastic analysis of cylindrical pressure vessels with various end closures

The well-known problem of the elastic analysis of cylindrical pressure vessels with hemispherical, torispherical and ellipsoidal heads, involving the partial differential equations for the classical theory of thin shells of revolution axisymmetric in character, is attempted here using a step-by-step integration procedure and a segmentation technique. The numerical results are obtained with a generalised computer program for a number of cases and for a given set of values of elastic moduli, Poisson's ratio and thickness diameter ratio. The results are compared with the known results available in literature and also with the stresses predicted by the ASME Code.