scholarly journals Determination of the Crack Resistance Parameters at Equipment Nozzle Zones Under the Seismic Loads Via Finite Element Method

2018 ◽  
Vol 48 (1) ◽  
pp. 69-75
Author(s):  
Vladyslav Kyrychok ◽  
Vasyl Torop
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Pressure Vessel ◽  
Residual Life ◽  
Pressure Vessels ◽  
Accurate Estimation ◽  
Seismic Loads ◽  
Finite Element Program ◽  
Element Program

Abstract The present paper is devoted to the problem of the assessment of probable crack growth at pressure vessel nozzles zone under the cyclic seismic loads. The approaches to creating distributed pipeline systems, connected to equipment are being proposed. The possibility of using in common different finite element program packages for accurate estimation of the strength of bonded pipelines and pressure vessels systems is shown and justified. The authors propose checking the danger of defects in nozzle domain, evaluate the residual life of the system, basing on the developed approach.

A Strength Calculation of a Nozzle Using Comparative Methods

2014 ◽  
Vol 601 ◽  
pp. 84-87 ◽  
Author(s):  
Serban Vasilescu ◽  
Costin Ilinca
Keyword(s):  
Finite Element ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Comparative Methods ◽  
The Finite Element Method ◽  
Finite Element Program ◽  
Element Program ◽  
Section Viii ◽  
Torsional Loads ◽  
Division 2

The stresses and deflections developed due to all piping loads produce some significant deformation in the nozzles of the pressure vessels. In this paper a spherical pressure vessel with two cylindrical nozzles are analyzed. The stresses in the nozzles are evaluated using two comparative methods: one of them represents the classical way of using the superposition of the axial, bending and torsional loads; the other one is based on the requirements of the ASME Boiler and Pressure Vessel Cod, Section VIII, Division 2 and is developed by a FE analysis. In order to obtain the loads (forces and moments) at the end of the nozzle a specialized finite element program has been used. This program (Coade Caesar 5.30) allows studying the strength and flexibility behavior of the pipes that connect the analyzed nozzle with the rest of the plant. The results obtained are compared in order to find when the using of the classical methods of strength of materials can be used as conservative approaches. The finite element method is applied in order to check the most important load cases that appear during the interaction between pipes and shell. In this respect the sustained (proper gravity loads), expansion (thermal loads) and occasional (wind and seismic loads) are combined in order to check all the requirements of ASME. This study contains also the effect of the pressure trust and the influence of the real geometry of the junction (nozzle-shell) in the peaks of the stresses.

Stress Distribution in the Region Around Two Normally Intersecting Pipes due to In-Plane Bending Moments Using Finite Element Method

1997 ◽  
Author(s):  
Darmawan Harsokoesoemo ◽  
Gatot Santoso
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Bending Moments ◽  
Finite Element Program ◽  
Data Presentation ◽  
Calculated Stress ◽  
Intersecting Pipes ◽  
Element Program ◽  
Plane Bending

Numerically calculated stress in the region of two normally intersecting pipes due to in-plane bending moments using finite element program MECHANICA are presented in this paper. The computer results were processed and then presented in stress versus location (along several lines) diagrams. Other investigators’ results for similar problem are not easy to obtain due to differences in the problem, in modelling, in finite element program used and in methods of data presentation. Lock et al (1985) and Moffat et al (1984) works were the closest for comparison purposes.

Moving Grid Method for Simulating Crack Propagation

2013 ◽  
Vol 405-408 ◽  
pp. 3173-3177
Author(s):  
Shu Feng Xu ◽  
Huai Fa Ma ◽  
Yong Fa Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crack Propagation ◽  
Grid Method ◽  
Nonlinear Finite Element ◽  
Moving Grid ◽  
Finite Element Program ◽  
Element Program ◽  
Element Algorithm ◽  
Element Method

A moving grid nonlinear finite element method was used in this study to simulate crack propagation. The relevant elements were split along the direction of principal stress within the element and thus automatic optimization processing of local mesh was realized. We discussed the moving grid nonlinear finite element algorithm was proposed, compiled the corresponding script files based on the dedicated finite element language of Finite Element Program Generator (FEPG), and generate finite element source code programs according to the script files. Analyses show that the proposed moving grid finite element method is effective and feasible in crack propagation simulation.

scholarly journals Use of the Finite Element Method in Predicting Vibrations of Sandwich Beams and Plates Resting on Deformable Foundations Subjected to Moving Loads

2017 ◽  
Vol 63 (4) ◽  
pp. 51-69
Author(s):  
A. Zbiciak ◽  
M. Ataman ◽  
W. Szcześniak
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boundary Conditions ◽  
Core Layer ◽  
Sandwich Beams ◽  
Moving Loads ◽  
The Finite Element Method ◽  
Finite Element Program ◽  
Element Program ◽  
Foundation Parameters

AbstractThis paper presents the capabilities of ABAQUS finite-element program [1] in modelling sandwich beams and plates resting on deformable foundations. Specific systems of sandwich beams and plates separated by an elastic core layer were subjected to the action of point and distributed moving loads. A few theoretical examples are provided to present different techniques of modelling the foundations and the moving loads. The effects of the boundary conditions and of the foundation parameters on the deflections of the analysed structures are also presented.

Further Developments in Applying the Finite Element Method to the Calculation of Temperature Distributions in Machining and Comparisons With Experiment

1983 ◽  
Vol 105 (3) ◽  
pp. 149-154 ◽  
Author(s):  
M. G. Stevenson ◽  
P. K. Wright ◽  
J. G. Chow
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Fields ◽  
The Finite Element Method ◽  
Finite Element Program ◽  
Temperature Distributions ◽  
Wide Range ◽  
Metal Machining ◽  
Element Program ◽  
Element Method

The finite element program developed in previous work [1] for calculating the temperature distributions in the chip and tool in metal machining has been extended in its range of application. Specifically, the program no longer needs a flow field as input and it can accommodate a wide range of shear angle and contact lengths. An important feature of this paper is that temperature fields from the finite element method have been compared with temperatures obtained with a previously described metallographic method [7]. This is the first time these two techniques have been used for the same machining conditions and the comparisons are very good.

Finite Element Analysis of a Quasi-Static Rolling Tire Model for Determination of Truck Tire Forces and Moments

1996 ◽  
Vol 24 (4) ◽  
pp. 278-293 ◽  
Author(s):  
A. A. Goldstein
Keyword(s):  
Finite Element ◽  
Ground Plane ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Finite Element Program ◽  
Truck Tire ◽  
Element Program ◽  
Longitudinal Slip ◽  
Tire Forces

Abstract The finite element method is used to simulate the slow (quasi-static) rolling of a radial truck tire subjected to ground plane tractions. Three conditions are considered, namely, (1) straight free rolling, (2) cornering, and (3) braking. Lateral and longitudinal slip are calculated by analyzing the motion of a moveable road surface relative to the wheel plane. Footprint moments are calculated for the cornering and braking condition. In addition, cornering stiffness, braking stiffness, and aligning stiffness are calculated and compared to measured results. Computational benchmark data is provided. The simulation was performed with the ABAQUS finite element program.

Unique Design of Pressure Vessel With Tooth-Locked Quick-Actuating Closures Based on Finite Element Model Analysis

2016 ◽  
Vol 139 (3) ◽  
Author(s):  
Wenxian Su ◽  
Wanyi Geng ◽  
G. E. O. Widera
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Pressure Vessel ◽  
Coulomb Friction ◽  
Element Model ◽  
Pressure Vessels ◽  
Contact Element ◽  
The Finite Element Method ◽  
Novel Method

A novel method is developed for the design of pressure vessels with tooth-locked quick-actuating closures by considering the contact between the teeth and utilizing the surface-to-surface contact model with contact element and coulomb friction. Elastic and elastic–plastic analyses via the finite element method were employed. It is shown that these pressure vessels can meet the requirements of strength and fatigue.

scholarly journals Analysis of the eigenfrequencies of the basalt machine parts by the FEM

2021 ◽  
Vol 343 ◽  
pp. 08002
Author(s):  
Ilie Octavian Popp
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Machine Tools ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Finite Element Program ◽  
Element Program ◽  
Beam Type ◽  
Machine Parts ◽  
Plate Type

The aim of this paper was to carry out a theoretical (numerical) scientific research on the behavior of cast and recrystallized basalt, in order to use it as a material in the manufacture of structural elements of machine tools. A unitary methodology has been established for studying the eigenfrequency of structural elements for machine tools by the finite element method. Two basalt structural elements (beam type and plate type) were modeled, which were also made physically, and with the help of the COSMOS / Mark finite element program, the eigenfrequencies of the models was studied.

A Numeric Analyses Method and Application of Loess Collapse Deformation

2011 ◽  
Vol 105-107 ◽  
pp. 1572-1575
Author(s):  
Rong Jian Li ◽  
Liu Ming Fan ◽  
Wen Zheng ◽  
Gao Feng Che
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Finite Element ◽  
Computational Results ◽  
Nonlinear Finite Element Method ◽  
Finite Element Program ◽  
Plate Test ◽  
Collapsible Loess ◽  
Element Program ◽  
Modulus Method

The collapse settlement of loess foundation is one of issues in engineering which need to be solved. Firstly, a finite element program was developed and the computational function of collapse deformation was implemented based on chord modulus method. Then, the comparison of the measured collapse settlement in a loading plate test and the computational collapse settlement based on the finite element were analyzed. The computational results show that the nonlinear finite element method based on the chord modulus should be recommended to evaluate the collapse deformation, owing to its potential application that it may consider the collapse deformation field of the whole collapsible loess foundation.

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