Experimental Investigation of Cylindrical Shell Stresses due to Penetration Loads Where R/T = 1264

1983 ◽  
Vol 105 (3) ◽  
pp. 201-206 ◽  
Author(s):  
R. A. Whipple ◽  
J. Hagstrom ◽  
H. Dykstra
Keyword(s):  
Experimental Investigation ◽  
Cylindrical Shell ◽  
Pressure Vessel ◽  
Test Procedure ◽  
Cylindrical Panel ◽  
Diameter Ratio ◽  
Bending Moments ◽  
Membrane Stress ◽  
Test Program ◽  
Radial Forces

Stresses and displacements for a nozzle connection typical of those found in a large storage or pressure vessel were measured for applied radial forces, circumferential moments and longitudinal moments. The test program was conducted on a 2 1/2-in. φ penetration, centered and welded into a 60 in. × 60 in. cylindrical panel with a radius to thickness ratio of 1264. The nozzle diameter to cylindrical shell diameter ratio was 0.01. The panel edges were bolted to a stiff rectangular frame. This report presents the measured radial deflections and nozzle rotations, the membrane stress resultants and shell bending moments in the vicinity of the penetration for the three loadings. A brief description of the model and the test procedure is also presented.

Experimental Investigation of Nozzle-Induced Cylindrical Shell Stresses Where R/T = 1264

1986 ◽  
Vol 108 (1) ◽  
pp. 98-107
Author(s):  
R. A. Whipple
Keyword(s):  
Cylindrical Shell ◽  
Test Procedure ◽  
Cylindrical Panel ◽  
Pressure Vessels ◽  
Bending Moments ◽  
Storage Tanks ◽  
Membrane Stress ◽  
Test Program ◽  
Bending Stresses ◽  
Radial Forces

Stresses and displacements for a nozzle connection typical of those found in large storage tanks or pressure vessels were measured for applied radial forces, circumferential moments and longitudinal moments. The test program was conducted on a 12 1/2-in-dia penetration, centered and welded into a 60 in. × 60 in. cylindrical panel with a radius to thickness ratio of 1264. The nozzle diameter to cylindrical shell diameter ratio was 0.05. The panel edges were bolted to a stiff rectangular frame. This report presents the measured radial deflections and nozzle rotations, the membrane stress resultants and shell bending moments in the vicinity of the penetration along with penetration membrane and bending stresses for the three loadings. A brief description of the model and the test procedure is also presented.

Thin-Shell Pressure Vessel Theoretical and Experimental Stresses

1963 ◽  
Vol 85 (2) ◽  
pp. 195-200
Author(s):  
Edward O. Jones
Keyword(s):  
Experimental Investigation ◽  
Cylindrical Shell ◽  
Theoretical Analysis ◽  
Pressure Vessel ◽  
Thin Shell

This paper is concerned primarily with a comparison of experimental and theoretical shell-to-head junction stresses of a thin-shell pressure vessel. The portion of the vessel with which this investigation was concerned was the region at the junction of a two-to-one ellipsoidal head and a cylindrical shell. Both a discussion of the theoretical analysis and a description of the experimental investigation are included in the paper.

scholarly journals Analytical Study of Thermomechanical Strength of Assemblies with Optional Plane Flanges. The Effect of the Flange Ring Rotation Around the Median Circumference

2001 ◽  
Vol 71 (3) ◽  
pp. 79-89
Author(s):  
Radu I. Iatan ◽  
Georgeta Roman (Urse) ◽  
Gheorghita Tomescu ◽  
Angela Chelu
Keyword(s):  
Cylindrical Shell ◽  
Pressure Vessel ◽  
Analytical Study ◽  
Mechanical Stresses ◽  
Bending Moments ◽  
Analytical Evaluation ◽  
Shear Forces ◽  
Radial Displacements ◽  
Ring Rotation ◽  
Deformation Compatibility

This paper describes the analytical evaluation of the thermo - mechanical stresses developed in the circular flange assemblies, of optional type, welded to the cylindrical shell of a pressure vessel. In this case, the structure is formed by welding the cylindrical shell on the inner circumference of the flange ring. Based on the theory of deformation compatibility (radial displacements and rotations), the expressions for the evaluation of radial unitary bending moments and the unitary shear forces are deduced. Subsequently, stress values can be calculated and their concentration can be evaluated along the cylindrical shell, below the separation plane of the flange ring.

An Experimental Investigation of the Dynamics of a Loosely Supported Tube Array

2017 ◽  
Author(s):  
Amro Elhelaly ◽  
Marwan Hassan ◽  
Atef Mohany ◽  
Soha Moussa
Keyword(s):  
Experimental Investigation ◽  
Impact Force ◽  
Cross Flow ◽  
Open Loop ◽  
Diameter Ratio ◽  
Force Level ◽  
Steam Generators ◽  
Flow Induced Vibration ◽  
System Integrity ◽  
Tube Bundles

The integrity of tube bundles is very important especially when dealing with high-risk applications such as nuclear steam generators. A major issue to system integrity is the flow-induced vibration (FIV). FIV is manifested through several mechanisms including the most severe mechanism; fluidelastic instability (FEI). Tube vibration can be constrained by using tube supports. However, clearances between the tube and their support are required to allow for thermal expansion and for other manufacturing considerations. The clearance between tubes may allow frequent impact and friction between tube and support. This in turn may cause fatigue and wear at support and potential for catastrophic tube failure. This study aims to investigate the dynamics of loosely supported tube array subjected to cross-flow. The work is performed experimentally in an open-loop wind tunnel to address this issue. A loosely-supported single flexible tube in both triangle and square arrays subjected to cross-flow with a pitch-to-diameter ratio of 1.5 and 1.733, respectively were considered. The effect of the flow approach angle, as well as the support clearance on the tube response, are investigated. In addition, the parameters that affect tube wear such as impact force level are presented.

An Investigation of Cavitation and Suction Vortices Behavior in Pump Sump

2011 ◽  
Author(s):  
Won-Tae Kang ◽  
Ki Han Yu ◽  
Seung Yeob Lee ◽  
Byeong Rog Shin
Keyword(s):  
Experimental Investigation ◽  
Numerical Analysis ◽  
Test Procedure ◽  
Three Dimensional ◽  
Water Levels ◽  
National Standard ◽  
Piping System ◽  
Test Model ◽  
Grid Systems ◽  
Volume Method

A numerical and an experimental investigation on a suction vortices including cavitation, free vortices and subsurface vortices behavior in the model sump system with multi-intakes is performed at several flow rates and water levels. A test model sump and piping system were designed based on Froude similitude for the prototype of the recommended structure layout by HI-9.8 American National Standard for Pump Intake Design of the Hydraulic Institute. An experiment is performed according to the sump model test procedure of Hyosung Goodsprings, Inc. A numerical analysis of three dimensional multiphase flows through the model sump is performed by using the finite volume method of the CFX code with multi-block structured grid systems. A k-ω Shear Stress Transport turbulence model and the Rayleigh-Plesset cavitation model are used for solving turbulence cavitating flow. Several types of free surface and submerged vortex which occurs with each different water level are identified through the experimental investigation. From the numerical analysis, the vortices are reproduced and their formation, growing, shedding and detailed vortex structures are investigated. To reduce abnormal vortices, an anti-vortex device is considered and its effect is investigated and discussed.

Vibrational and acoustic radiation from a submerged periodic cylindrical shell with axial stiffening

2009 ◽  
Vol 223 (5) ◽  
pp. 1083-1089 ◽  
Author(s):  
C-J Liao ◽  
W-K Jiang ◽  
H Duan ◽  
Y Wang
Keyword(s):  
Cylindrical Shell ◽  
Analytical Study ◽  
Acoustic Radiation ◽  
Sound Radiation ◽  
Mechanical Impedance ◽  
Stiffened Cylindrical Shell ◽  
Reaction Forces ◽  
Radial Forces ◽  
Vibration And Sound Radiation ◽  
Finite Cylindrical Shell

An analytical study on the vibration and acoustic radiation from an axially stiffened cylindrical shell in water is presented. Supposing that the axial stiffeners interact with the cylindrical shell only through radial forces, the reaction forces on the shell from stiffeners can be expressed by additional impedance. The coupled vibration equation of the finite cylindrical shell with axial stiffening is derived; in this equation additional impedance caused by the axial stiffeners is added. As a result, the vibration and sound radiation of the shell are dependent on the mechanical impedance of the shell, the radiation sound impedance, and the additional impedance of the axial stiffeners. Based on the numerical simulation, it is found that the existence of axial stiffeners decreases the sound radiation and surface average velocity, whereas it increases the radiation factor. The characteristics of the acoustic radiation can be understood from the simulation with good results, which show that the presented methodology can be used to study the mechanism of the acoustic radiation of the complicated cylindrical shell and to optimize its design.

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