Analytical and Experimental Stress Analysis of a Cylinder-to-Cylinder Structure

1977 ◽  
Vol 99 (4) ◽  
pp. 575-583 ◽  
Author(s):  
S. J. Brown ◽  
L. D. Haizlip ◽  
J. M. Nielsen ◽  
S. E. Reed
Keyword(s):  
Shell Thickness ◽  
Experimental Testing ◽  
Three Dimensional ◽  
Structural Response ◽  
Isoparametric Element ◽  
Experimental Stress Analysis ◽  
Dimensional Finite Element ◽  
Incompatible Modes ◽  
Photoelastic Analysis ◽  
Three Dimensional Finite Element

This paper presents a comparison of stress results obtained using the FESAP three-dimensional finite element computer program with results obtained from experimental testing. The comparison was obtained for the case of internal pressure applied to a cylinder-to-cylinder structure with a variable shell thickness at the juncture and a D/d of 1.6. The experimental testing conducted at the Babcock & Wilcox Research Center, Alliance, Ohio, consisted of strain gage testing followed by a “stress freezing” photoelastic analysis. The numerical analysis was performed at the Babcock & Wilcox Nuclear Equipment Division using the FESAP three-dimensional isoparametric element with incompatible modes. The model mesh was generated with the program FEMEG which is briefly discussed. The paper includes a detailed description of both the experimental and analytical studies. It is concluded that FESAP, with the eight-node incompatible mode element can accurately and economically predict the structural response of complex components.

Use of Sub-Modeling Techniques to Calculate Peak Stresses in Bolt Head-to-Shank Fillet Radius

2008 ◽  
Author(s):  
Richard E. Smith ◽  
Stephen J. Speicher
Keyword(s):  
Three Dimensional ◽  
Structural Response ◽  
Peak Stress ◽  
Finite Element Models ◽  
Stress Concentrations ◽  
Sufficient Detail ◽  
Structural Details ◽  
Modeling Techniques ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

There is an ever-increasing use of three-dimensional finite element models in the field of structural analysis to simulate structural response of complex geometries. Although these models are effective in simulating gross structural behavior, they are oftentimes not able to include sufficient detail to simulate small structural details where stress concentrations can occur. To overcome this limitation, sub-models can be used to calculate stresses in areas of peak stress. This paper discusses the process involved in calculating peak stresses in bolt head-to-shank interfaces using sub-modeling methods.

Soil–pipeline interaction along unstable slopes: a coupled three-dimensional approach. Part 2: Numerical analyses

2009 ◽  
Vol 46 (11) ◽  
pp. 1305-1321 ◽  
Author(s):  
Giuseppe Cocchetti ◽  
Claudio di Prisco ◽  
Andrea Galli
Keyword(s):  
Piecewise Linear ◽  
Three Dimensional ◽  
Small Diameter ◽  
Structural Response ◽  
Companion Paper ◽  
Small Displacement ◽  
Beam Elements ◽  
Dimensional Finite Element ◽  
Displacement Profile ◽  
Three Dimensional Finite Element

The soil–pipe interaction constitutive model, based on the concept of the “macroelement” described in a companion paper, has been implemented according to a piecewise linear (PWL) formulation in a three-dimensional finite element code in which the pipe is discretised by means of beam elements. To draw an interpretative theoretical framework for the structural response of the system, some ideal problems in which the pipeline is assumed to be straight and the displacement profile simple are discussed. Both large and small displacement approaches are employed, and the problem of axial instability of pipelines is also analysed. Monitoring data from three real case studies have also been numerically simulated: the first two concern pipelines subject to transversal slow soil movements and the third one refers to a small diameter pipeline subject to failure due to axial instability.

scholarly journals Human comfort assessment of buildings subjected to nondeterministic wind dynamic loadings

2020 ◽  
Vol 13 (4) ◽  
Author(s):  
Alan Barile ◽  
Leonardo de Souza Bastos ◽  
José Guilherme Santos da Silva
Keyword(s):  
Coherence Function ◽  
Research Work ◽  
Three Dimensional ◽  
Structural Response ◽  
Element Model ◽  
Spectral Density Function ◽  
Human Comfort ◽  
Analysis Methodology ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

ABSTRACT A reliable human comfort assessment depends on the correct description of the wind dynamic loads when compared with studies of natural wind. Thus, in this research work an analysis methodology was developed aiming to generate nondeterministic dynamic wind loadings, based on a power spectral density function and coherence function. This way, aiming to test the developed analysis methodology, a forced vibration dynamic analysis was carried out, based on a three-dimensional finite element model developed to represent a real and existing thirty-storey reinforced concrete building, with total height of 90 m, store height equal to 3 m and rectangular dimensions of 21.50 m by 17.30 m. The dynamic structural response of the investigated building was evaluated, the accelerations at the top of the structure were calculated and the human comfort was verified. The results obtained along this research work indicate that the peak accelerations calculated for periods of recurrence equal to 10 years and 1 year, respectively, overpass the recommended limits proposed by the NBR 6123 and ISO 10137.

scholarly journals Structural response of French offshore heritage lighthouses

2019 ◽  
Vol 377 (2155) ◽  
pp. 20190011 ◽  
Author(s):  
Emmanuel Denarié ◽  
Nicolas Fady
Keyword(s):  
Three Dimensional ◽  
Measurement Data ◽  
Structural Response ◽  
Breaking Waves ◽  
Breaking Wave ◽  
To The Lighthouse ◽  
Dimensional Finite Element ◽  
Wave Event ◽  
Historical Heritage ◽  
Three Dimensional Finite Element

Offshore lighthouses are a remarkable historical heritage often over 100 years old. The management of their ageing is a challenge and requires a thorough understanding of their structural response under wave loading. With this aim in view, the dynamic response of the ‘La Jument’ lighthouse in the French Iroise Sea was characterized in situ , with accelerometers, under the action of a breaking wave, during a winter storm in January 2018. Detailed exploitation of the measurement data complemented by photographic documentation of the same wave event helped determine eigenfrequencies and damping coefficients of the structure as well as the likely orientation of the wave and the position of its crest with respect to the lighthouse tower. The results of these analyses were put into perspective with those of literature and more specifically from three-dimensional finite element modelling of the structural response of the lighthouse under the action effects of breaking waves. This article is part of the theme issue ‘Environmental loading of heritage structures’.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Tire Modeling by Finite Elements

1992 ◽  
Vol 20 (1) ◽  
pp. 33-56 ◽  
Author(s):  
L. O. Faria ◽  
J. T. Oden ◽  
B. Yavari ◽  
W. W. Tworzydlo ◽  
J. M. Bass ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Rolling Contact ◽  
Test Problems ◽  
State Behavior ◽  
Normal Contact ◽  
New Developments ◽  
Applied Torque ◽  
Dimensional Finite Element ◽  
Tire Modeling ◽  
Three Dimensional Finite Element

Abstract Recent advances in the development of a general three-dimensional finite element methodology for modeling large deformation steady state behavior of tire structures is presented. The new developments outlined here include the extension of the material modeling capabilities to include viscoelastic materials and a generalization of the formulation of the rolling contact problem to include special nonlinear constraints. These constraints include normal contact load, applied torque, and constant pressure-volume. Several new test problems and examples of tire analysis are presented.

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