Sealing Analysis of Metallic Interfaces Applied to Shutdown Ball Valves

2009 ◽  
Author(s):  
M. O. Branda˜o ◽  
T. A. Netto
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Ball Valve ◽  
Metallic Surface ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Atomic Force ◽  
Metallic Interfaces ◽  
Sealing Mechanism

This paper presents rough metallic surface contact analysis focusing on the sealing mechanism in metallic interfaces of subsea shut down ball valves. The work is divided in two parts: initially, the actual rough metallic sealing surface of a ball valve is measured and evaluated by using an atomic force microscope (AFM). The surface is modeled using the finite element method in order to estimate the load to cause the plastic deformation needed for proper sealing. Then a case study is carried out to compare the effectiveness of combined sealing (rubber and metal) and metal-to-metal sealing. Based on the experimental measurements and numerical results, some manufacturing procedures for increasing the reliability of a metal-to-metal sealing in shut-down ball valves are presented.

Frontal Impact Analysis of an Interprovincial Bus Using the Finite Element Method: Case Study in Ecuador

2020 ◽  
pp. 312-320
Author(s):  
Luis Santos-Correa ◽  
Diego Pineda-Maigua ◽  
Fernando Ortega-Loza ◽  
Jhonatan Meza-Cartagena ◽  
Ignacio Abril-Naranjo ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Impact Analysis ◽  
Frontal Impact ◽  
The Finite Element Method ◽  
Element Method

Seepage and Heat Flow in Soil Freezing

1982 ◽  
Vol 104 (2) ◽  
pp. 323-328 ◽  
Author(s):  
P. E. Frivik ◽  
G. Comini
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Seepage Flow ◽  
Soil Freezing ◽  
Temperature Fields ◽  
Laboratory Model ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Freezing And Thawing ◽  
Velocity And Temperature Fields

In this paper we describe a system of computer programs based on the finite element method, which can be used for the calculation of coupled velocity and temperature fields during freezing and thawing of soils in the presence of seepage flow. In the programs, the mass and energy conservation equations are solved simultaneously, without the use of too limiting assumptions. The results of the computations are compared with experimental measurements made on a laboratory model of a soil freezing system, and the agreement between measured and computed values is good.

scholarly journals Assessing Structural Damage after a Severe Wildfire: A Case Study

Buildings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 171
Author(s):  
Angeliki Papalou ◽  
Dimitrios K. Baros
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Distribution ◽  
Structural Damage ◽  
Extreme Heat ◽  
The Finite Element Method ◽  
Residential Areas ◽  
Severe Damage ◽  
Construction Type

Wildfires have always been a threat to forests and areas of high combustible vegetation. When they are not kept under control, they can spread to residential areas, creating severe damage and destruction. This paper examines the effects of the extreme heat conditions that developed during a wildfire on buildings as a function of their construction type. One of the deadliest wildfires in Greece (July 2018) is considered as a case study, and the damage that occurred to buildings during this event is presented. The temperature of the various structural subsystems in extreme heat conditions was estimated using the finite element method. Parameters that influenced the corresponding temperature distribution were identified. Simple guidelines are given to prevent or reduce damage in buildings exposed to wildfires.

Crystallographic Textures Variation in Asymmetrically Rolled Steel

2010 ◽  
Vol 638-642 ◽  
pp. 2811-2816 ◽  
Author(s):  
Sebastian Wroński ◽  
Krzysztof Wierzbanowski ◽  
Brigitte Bacroix ◽  
Mirosław Wróbel ◽  
M. Wroński
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Low Carbon Steel ◽  
Deformation Model ◽  
Texture Formation ◽  
Rolled Steel ◽  
Low Carbon ◽  
The Finite Element Method ◽  
Asymmetric Rolling ◽  
Macro Scale

The crystallographic texture formation in low carbon steel during asymmetric rolling was studied experimentally and analysed numerically. Modelling of plastic deformation was done in two scales: in the macro-scale using the finite element method ( FEM) and in crystallographic scale using the polycrystalline deformation model (LW model). The stress distribution in the rolling gap was calculated using FEM and next these stresses were applied in LW model of polycrystalline plastic deformation. In general, the predicted textures agree very well with experimental ones.

scholarly journals Pressure Loss in Ducts by Dissipative Splitter Silencers: Comparative Study of Standardized, Numerical and Experimental Results

2021 ◽  
Vol 11 (22) ◽  
pp. 10998
Author(s):  
Bartosz Chmielewski ◽  
Iván Herrero-Durá ◽  
Paweł Nieradka
Keyword(s):  
Finite Element Method ◽  
Comparative Study ◽  
Pressure Loss ◽  
Industrial Applications ◽  
Flow Speed ◽  
Point Of View ◽  
Experimental Measurements ◽  
Sound Waves ◽  
The Finite Element Method ◽  
Input Face

Dissipative splitter silencers are widely used in industry for the reduction of propagated sound waves in ducts. Even though these systems are effective from the acoustics point of view when they are properly designed, they also introduce a pressure loss in the system, due to the modification of the properties of the flow circulating inside the duct. This effect is not desired in some industrial applications, so it is necessary to be able to predict the pressure loss as precisely as possible to design silencers according to the needs. Nevertheless, the prediction made by standards are usually limited to given geometries or flow speed. In this work, we present a comparative study on the results obtained for the pressure loss by means of the standards ISO 14163 and VDI 1801-1, numerical simulations with the finite element method, and experimental measurements. Additionally, two different profile shapes and four input face velocities are tested in order to know the influence of these parameters in the variations of the flow and the accuracy of the prediction of the different methods.

Steady-state multiphysics analysis of stator bar using finite element method

2020 ◽  
pp. 1-14
Author(s):  
José William Ribeiro Borges ◽  
Wellington da Silva Fonseca ◽  
Fernando de Souza Brasil ◽  
Ramon C.F. Araújo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
Thermal Effects ◽  
Experimental Measurements ◽  
The Finite Element Method ◽  
Insulation System ◽  
State Behavior ◽  
Steady State Behavior ◽  
Element Method

The electrical insulation is one of the main sources of failures in hydro-generators, therefore it is important to research the insulation system of stator bars. In this paper, it is developed a steady-state multiphysics analysis of a stator bar using the Finite Element Method to assess its steady-state behavior in the electrical, magnetic and thermal domains. Different aspects are analyzed in simulations, such as capacitance, mechanical stress and thermal effects. Numerical results are compared with experimental measurements for validation.

scholarly journals Case Study of Support Frame Optimization Using a Distant Load

2020 ◽  
Vol 12 (3) ◽  
pp. 974
Author(s):  
Paweł Lonkwic ◽  
Krzysztof Przystupa ◽  
Tomasz Krakowski ◽  
Hubert Ruta
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structure Optimization ◽  
Strength Criterion ◽  
Frame Structure ◽  
The Finite Element Method ◽  
Optimization Analysis ◽  
Manufacturing Optimization ◽  
Before And After

This article presents the results of the structure optimization for the power unit carrying frame of a friction lift by means of numerical calculations using the finite element method (FEM). Optimization analysis covered the frame structure. The analysis was focused on strength optimization with the use of a remote load and on manufacturing optimization with attention paid to the operating times necessary to complete the production process of the carrying frame subassemblies. The Solidworks simulation program was used to optimize the frame in terms of the strength criterion. The program allowed both quantitative and qualitative assessments of the frame material effort before and after optimization.

Analysis of the Large Plastic Deformation Involved in Wear Processes Using the Finite Element Method With an Updated Lagrangian Formulation

1987 ◽  
Vol 109 (2) ◽  
pp. 330-337 ◽  
Author(s):  
Nobuo Ohmae
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Finite Element ◽  
Equivalent Stress ◽  
Lagrangian Formulation ◽  
The Finite Element Method ◽  
Large Plastic Deformation ◽  
Updated Lagrangian Formulation ◽  
Updated Lagrangian ◽  
Element Method

Large plastic deformation caused by friction for high purity copper was investigated using the finite element method with an updated Lagrangian formulation. The phenomenological background of this large plastic deformation was studied with a scanning electron microscope, and the nucleation of voids similar to those obtained for copper rolled to over 50 percent reduction was observed. Void nucleation was found to correlate with the agglomeration of over-saturated vacancies formed under high plastic strains. The computer-simulation analyzed such heavy deformation with an equivalent stress greater than the tensile strength and with an equivalent plastic strain of 0.44. Crack propagation was discussed by computing the J-integrals.

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