Finite Element Analysis and Experimental Investigation of Tubesheet Structure

2008 ◽  
Vol 131 (1) ◽  
Author(s):  
C. F. Qian ◽  
H. J. Yu ◽  
L. Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Cylindrical Shell ◽  
Heat Exchangers ◽  
Thermal Load ◽  
Axial Strain ◽  
Element Analysis ◽  
Shell Elements ◽  
Different Types ◽  
Analysis Models

In order to investigate the possibility of numerical simulation for whole structures of heat exchangers, two finite element analysis models have been established for the fixed tubesheet structure composed of tubesheet, cylindrical shell, and tubes using different types of elements. Stresses and deformations produced by pressure load or thermal load are calculated, and the axial strain at the middle area of the cylindrical shell is experimentally measured. By comparing the numerical results with experimental measurements, it is found that both finite element analysis models can give satisfactory results. Considering the difficulties in modeling heat exchangers, beam and shell elements are recommended.

Numerical Design of Tubesheet Structure Based on Finite Element Analysis

2010 ◽  
Author(s):  
Xiaodong Yu ◽  
Caifu Qian ◽  
Hongjie Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Exchangers ◽  
Element Analysis ◽  
Pressure Load ◽  
Welding Method ◽  
Numerical Design ◽  
Strength And Stiffness ◽  
Analysis Models

In this paper, finite element analysis models were established to simulate a tubesheet connected with tubes by expanding or welding method. Stresses and deformations in the tubesheet produced by pressure load were calculated with emphasis on the effect of the tubes support. Results showed that the deflections and stresses at the un-perforated zone are greatly affected by the radius of the perforated circle for a partly perforated tubesheet, but they are not sensitive to the radius of the tubesheet when it is fully supported by tubes. If applying numerical design for heat exchangers based on finite element analysis, the tubesheet thickness could be significantly reduced. Compared with the welding connection, expanding connection of the tubes and tubesheet is more helpful to raise the strength and stiffness of the perforated tubesheet.

On the Design Approach of Double-Tubesheets

2010 ◽  
Vol 118-120 ◽  
pp. 650-654
Author(s):  
Hong Jie Yu ◽  
Cai Fu Qian ◽  
Ri Cao
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Heat Exchangers ◽  
Design Codes ◽  
Element Analysis ◽  
Heat Exchanger Design ◽  
Accurate Stress Analysis ◽  
Analysis Models ◽  
Accurate Stress

Double-tubesheets are used in heat exchangers where strict tightness is required. In this paper, finite element analysis models were established to simulate the double-tubesheets. Stresses and deformations in the tubesheets induced by pressure load were calculated and formulated. Results showed that the tube supports to the tubesheet are much stronger than considered in the commonly used heat exchanger design codes. If the design is based on accurate stress analysis using finite element method, the tubesheet thickness of heat exchangers could be significantly reduced. The two tubesheets strengthen each other especially when their spacing is short.

scholarly journals Analytical Model for Deflections of Bonded Posttensioned Concrete Slabs

2017 ◽  
Vol 2017 ◽  
pp. 1-7
Author(s):  
Min Sook Kim ◽  
Joowon Kang ◽  
Young Hak Lee
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Model ◽  
Flexural Behavior ◽  
Concrete Slabs ◽  
Element Analysis ◽  
Shell Elements ◽  
Flexural Testing ◽  
Posttensioned Concrete ◽  
Different Types

This paper presents a finite element analysis approach to evaluate the flexural behavior of posttensioned two-way slabs depending on the tendon layout. A finite element model was established based on layered and degenerated shell elements. Nonlinearities of the materials are considered using the stress-strain relationships for concrete, reinforcing steel, and prestressing tendons. Flexural testing of the posttensioned two-way slabs was conducted to validate the developed analytical process. Comparing the analytical results with the experimental results in terms of deflections, it showed generally good agreements. Also a parametric study was performed to investigate the effects of different types of tendon layout.

Linear Thermomechanical Microactuators

1999 ◽  
Author(s):  
Rebecca Cragun ◽  
Larry L. Howell
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Thermal Expansion ◽  
Cross Sections ◽  
Variable Cross ◽  
Element Analysis ◽  
Thermal Actuators ◽  
Output Force ◽  
Analysis Models ◽  
High Output

Abstract Thermomechanical in-plane microactuators (TIMs) have been designed, modeled, fabricated, and tested. TIMs offer an alternative to arrays of smaller thermal actuators to obtain high output forces. The design is easily modified to obtain the desired output force or deflection for specific applications. The operational principle is based on the symmetrical thermal expansion of variable cross sections of the surface micromachined microdevice. Sixteen configurations of TIMs were fabricated of polysilicon. Finite element analysis models were used to predict the deflection and output force for the actuators. Experimental results were also recorded for all sixteen configurations, including deflections and output forces up to 20 micron and 35 dyne.

Finite Element Analysis of Automobile Drive Axle Housing Based on ANSYS

2015 ◽  
Vol 741 ◽  
pp. 223-226
Author(s):  
Hai Bin Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Performance ◽  
Element Analysis ◽  
Shell Elements ◽  
Fea Model ◽  
Automobile Design ◽  
Housing Structure ◽  
Drive Axle ◽  
Drive Axle Housing

The performance of automobile drive axle housing structure affects whether the automobile design is successful or not. In this paper, the author built the FEA model of a automobile drive axle housing with shell elements by ANSYS. In order to building the optimization model of the automobile drive axle housing, the author studied the static and dynamic performance of it’s structure based on the model.

Parametric Modeling of Underground Powerhouse for Finite Element Analysis

2013 ◽  
Vol 405-408 ◽  
pp. 3222-3228
Author(s):  
Rong Gang Yin ◽  
Zhi Guo Li ◽  
Hong Xiang She ◽  
Jian Hai Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Model ◽  
Parametric Modeling ◽  
Element Analysis ◽  
Underground Powerhouse ◽  
Interactive Interface ◽  
Different Types ◽  
Basic Ideas ◽  
Display Window

In order to improve the modeling efficiency for finite element analysis pre-processing, a parametric modeling method of underground powerhouse for finite element analysis is proposed. By inputting the basic geometric parameters, different types of underground powerhouse models are built by using this method. The basic ideas, basic principle and the process of this parametric modeling are presented. And the parametric modeling procedure is coded by using VC++, interactive interface and display window are designed by using MFC and OpenGL. Finite element model of Houziyan underground powerhouse which is built by using the procedure proves that this method greatly improves the efficiency and precision of modeling.

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