The Pressure-Temperature Limit Curve of System-Integrated Modular Advanced Reactor Against Nonductile Failure

2007 ◽  
Author(s):  
Yoon-Suk Chang ◽  
Hyuk-Soo Chang ◽  
Sang-Min Lee ◽  
Jae-Boong Choi ◽  
Young-Jin Kim ◽  
...  
Keyword(s):  
Temperature Change ◽  
Sea Water ◽  
Three Dimensional ◽  
Design Procedure ◽  
Temperature Limit ◽  
Water Desalination ◽  
Electricity Production ◽  
Limit Curve ◽  
Crack Location ◽  
Three Dimensional Finite Element

A system-integrated modular advanced reactor is being developed for multi purposes such as electricity production, sea water desalination and so on in Korea. While ASME Codes provide simplified design and operation procedures to determine allowable loadings for pressure retaining materials in components, the procedures are applicable when a temperature change rate associated with startup and shutdown is less than about 56°C/hr. If the procedures are applied to a rapid temperature change, results would be overly conservative. The objective of this research is to assess an applicability of the simplified design procedures to reactor coolant system of the integrated modular reactor with the change rates of 56°C/hr and 100°C/hr. To investigate effects of cooldown rate, heatup rate and surface crack location, systematic three-dimensional finite element analyses are carried out. The resulting pressure-temperature limit curves are compared with those obtained from the ASME Sec. XI operating procedure as well as Sec. III design procedure. Thereby, it was proven that the specific design features significantly affect the safe design region in the pressure-temperature limit curve to prevent a nonductile failure.

Structural Stability Evaluation for Lifting Lug Design of Large Marine Engine by Finite Element Analysis

2007 ◽  
Vol 353-358 ◽  
pp. 2855-2859
Author(s):  
W.C. Lee ◽  
Chae Sil Kim ◽  
J.B. Na ◽  
D.H. Lee ◽  
S.Y. Cho ◽  
...  
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Design Procedure ◽  
Steel Structures ◽  
Stability Evaluation ◽  
Element Analysis ◽  
Marine Engines ◽  
Dimensional Finite Element ◽  
The Stability ◽  
Three Dimensional Finite Element

Since most marine engines are generally very huge and heavy, it is required to keep safety from accidents in dealing them. Several types of lifting lugs have been used to assemble hundred ton–large steel structures and carry the assembled engines. Recently a few crashes have been occurred in carrying engines due to breaking down the lugs. Although the stability evaluation of the lifting lug has therefore been very important for safety, systematic design procedure of the lugs, which includes the structural analysis considering stability, has few reported. This paper describes the three dimensional finite element structural modeling for a lifting lug, the studies for determining the reasonable loading and boundary conditions, and the stability evaluation with the results of structural analyses. It should be very helpful for designing the other types of lifting lugs with safety.

scholarly journals New Combined Solution to Harness Wave Energy—Full Renewable Potential for Sustainable Electricity and Fresh Water Production

Proceedings ◽  
2019 ◽  
Vol 20 (1) ◽  
pp. 10
Author(s):  
Michael Henriksen ◽  
Simon Davide Luigi Piccioni ◽  
Massimo Lai
Keyword(s):  
Fresh Water ◽  
Wave Energy ◽  
Sea Water ◽  
Real Life ◽  
Water Desalination ◽  
Electricity Production ◽  
Combined Solution ◽  
Sustainable Electricity ◽  
Technology Solution ◽  
Roll Out

This paper is a first general dissemination of the H2020 Project Wave to Energy and Water (W2EW) started in January 2019. The joint vision of the W2EW consortium (Wavepiston, Ener.Med, Fiellberg, Vryhof) is to deliver a world-beating wave powered technology solution for electricity production and desalination. It relies on the innovative integration of wave energy and sea water desalination technologies, to produce zero-emission electricity and fresh water, with dynamic optimization of energy production and maximizing the available wave energy using fresh water as storage. The W2EW solution enables competitive cost of electricity and water. The present project is critical to demonstrate the W2EW solution in a real-life environment, to reduce the risk profile of the solution and to build the market to pave the way for broad market roll-out. The scope of the paper is to introduce the project W2EW and its expected results to a broader audience.

Finite Element Limit Loads for Circumferential Through-Wall Cracked Pipe Bends Under In-Plane Bending

2006 ◽  
Author(s):  
Yun-Jae Kim ◽  
Chang-Sik Oh ◽  
Young-Il Kim ◽  
Chi-Yong Park
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Small Strain ◽  
Plastic Limit ◽  
Crack Location ◽  
Perfectly Plastic ◽  
Dimensional Finite Element ◽  
Plane Bending ◽  
Elastic Perfectly Plastic ◽  
Three Dimensional Finite Element

This paper proposes plastic limit and collapse loads for circumferential through-wall cracked pipe bends under in-plane bending, based on three-dimensional finite element limit analyses. The material is assumed to be elastic-perfectly-plastic, but both the geometrically linear (small strain) and the geometrically nonlinear (large geometry change) options are employed. Regarding crack location, both extrados and intrados cracks are considered. Moreover, for practical application, closed-form approximations of plastic limit and collapse loads are proposed based on the FE results, and compared with corresponding solutions for straight pipes.

Crake Effect on the Dynamic Characteristics of Elastically Coupled Beams

2011 ◽  
Vol 110-116 ◽  
pp. 328-336
Author(s):  
Samer A. M. Al-Said
Keyword(s):  
Dynamic Characteristics ◽  
Crack Depth ◽  
Three Dimensional ◽  
Model Verification ◽  
Elastic Coupling ◽  
Element Analysis ◽  
Crack Location ◽  
Dimensional Finite Element ◽  
Coupled Beams ◽  
Three Dimensional Finite Element

Simple mathematical model that describes the lateral vibration of elastically coupled cracked cantilever beams carrying rigid disk at their tips is derived. The derived model is used to study the effect of elastic coupling, crack depth and location on the dynamic characteristics of the system. The cracked beam is presented as two beams connected with torsional spring at the crack location. Model verification is carried out using three dimensional finite element analysis using ANSYS program, the verification results showed good agreement with that obtained from the proposed model. The study reveals that the first system natural frequency is affected by the crack and the elastic coupling.

Effects of Initial Crack Location on Failure Assessment Curves in Dissimilar Metal Weld Joints in Nuclear Power Plants

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
N. Gong ◽  
G. Z. Wang ◽  
F. Z. Xuan ◽  
S. T. Tu
Keyword(s):  
Three Dimensional ◽  
Initial Crack ◽  
Finite Element Analyses ◽  
Crack Location ◽  
Dissimilar Metal ◽  
Failure Assessment ◽  
Dimensional Finite Element ◽  
Dissimilar Metal Weld ◽  
Three Dimensional Finite Element ◽  
Metal Weld

Based on detailed three-dimensional finite element analyses, accurate, option 3, failure assessment curves (FACs) based on the R6 are constructed for a dissimilar metal weld joint (DMWJ) connecting the safe end to the pipe-nozzle of a reactor pressure vessel. The effects of initial crack location in the DMWJ structure on FACs are investigated. The results show that the plastic collapse of the DMWJ structure and the limit moment ML is mainly dominated by the plastic yield of the 316L material with lowest yield stress, and the crack locations in the DMWJ structure have less effect on the ML. When the load ratio Lr is less than 0.8, the crack locations have almost no effect on the FACs; while after the Lr is larger than 0.8, the crack locations have significant effect on the FACs. With the crack location moving from the safe end through the DMWJ toward the thickness transition in the pipe-nozzle, the FACs shift upward, which leads to a enlargement of the safe region in the failure assessment diagrams (FADs). This is mainly caused by the different properties of the materials in the DMWJ structure. To accurately assess the integrity of the DMWJ structure, the R6 option 3 FACs based on three-dimensional finite element analyses should be constructed and used for the cracks with different positions.

Heat and Mass Transfer Characteristics of Vapor Permeation in Sweeping Gas Membrane Distillation Systems for Sea Water Desalination

2019 ◽  
Author(s):  
Umar F. Alqsair ◽  
Anas M. Alwatban ◽  
Abdullah A. Alghafis ◽  
Ahmed M. Alshwairekh ◽  
Alparslan Oztekin
Keyword(s):  
Sea Water ◽  
Three Dimensional ◽  
Concentration Field ◽  
Membrane Distillation ◽  
Water Desalination ◽  
Membrane Properties ◽  
Membrane Thickness ◽  
Temperature Polarization ◽  
Dynamics Simulations ◽  
Sweeping Gas

Abstract Computational fluid dynamics simulations are conducted to study the performance of the sweeping gas membrane distillation module (SGMD) for seawater desalination process. The main objective of this work is to study the effect of membrane properties on the membrane flux performance and temperature and concentration polarization characteristics of the module. CFD simulations are conducted in a three-dimensional module to characterize the steady-state velocity, temperature and concentration field in the feed and permeate channel. The Reynolds number for the feed and the permeate stream are set to 900 and 2000, and thus the laminar flow model is adapted for each channel. The effects of the porosity and the membrane thickness are varied while the pore size is fixed for the parametric study. It is revealed that the membrane thickness has a profound influence while the membrane porosity has a slight influence on the SGMD performance. We observed a high level of temperature polarization within the module, which adversely affects the system performance. Remedies for mitigating temperature polarization should be considered for future studies.

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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