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.

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.

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 Drilling Frame on Down-the-Hole Drill Based on Mechanical Mechanics and Mechanical Properties

2014 ◽  
Vol 908 ◽  
pp. 282-286
Author(s):  
Wan Rong Wu ◽  
Lin Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Condition ◽  
Slenderness Ratio ◽  
Stress And Strain ◽  
Limit States ◽  
Element Analysis ◽  
Practical Engineering ◽  
Structure Strength ◽  
Strength And Stiffness

Drilling frame on TD165CH Down-The-Hole Drill that has large slenderness ratio and be longer than 10m is one component of Down-The-Hole drill which is mainly subjected to load.In the process of drilling, drilling frame is not only subjected to loads which are like tensile, compression and torsion and so on, and be under the influence of impacting and vibration of impactor,the situation of force is complicated.By analysing of working condition of Down-The-Hole drill,there get all kinds of limit states of typical working conditions, and then using Ansys doing finite element analysis, there get distribution of the stress and strain of drilling frame and the result of modal analysis to check whether drilling frame meets the requirements of strength and stiffness or not,and whether it is possible to resonate with the impactor or not.By analysis,Structure strength and stiffness of drilling Frame on TD165CH Down-The-Hole drill meet the requirements of practical engineering, and drilling Frame does not resonate with the impactor.

Weight and configuration optimization of the launcher pod using finite element analysis

2021 ◽  
pp. 154851292110675
Author(s):  
Mithilesh Kumar Dewangan ◽  
S K Panigrahi
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Loads ◽  
Initial Weight ◽  
Configuration Optimization ◽  
Element Analysis ◽  
Critical Location ◽  
Strength And Stiffness ◽  
The Given ◽  
Modification Of Materials

This paper deals with the stress analysis of the launcher pod based on optimization of its configuration and weight without compromising its strength and stiffness. The launcher pod assembly is a complex fabricated structure, which is subjected to a variety of dynamic loads during firing of rockets. A series of finite element simulations reveal the critical location of the pod for different loading conditions based on the stress magnitude, which helps to optimize its weight and configuration of the launcher pod. It has been observed that the optimized weight of the given launcher pod after modification of materials and configuration, with the provided materials, loading, and boundary conditions, is reduced by 36.27% (without launcher tubes and rockets) against the initial weight of the launcher pod.

260t Ladle Stress and Deformation Finite Element Analysis

2014 ◽  
Vol 936 ◽  
pp. 1886-1889
Author(s):  
Yan Ping Sun ◽  
De Chen Zhang ◽  
Ming Yang ◽  
Yuan Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Working Conditions ◽  
Structural Deformation ◽  
Analysis Software ◽  
Element Analysis ◽  
Strength And Stiffness ◽  
Stress And Deformation ◽  
Distribution Of Stress ◽  
Optimal Designing

In this paper, iron ladle stress and deformation has been accurately calculated using finite element analysis software ANSYS based on 260t iron ladle in standing, lifting, tipping working conditions. Distribution of stress field was obtained. The stiffness and strength of the iron ladle has been evaluated. The results show that the iron ladle in the standing, lifting and tipping working conditions, structural deformation is small, the strength and stiffness meet the requirements. This research extends the working life of 260t iron ladle. It provides theoretical basis for producing and using of the iron ladle and further optimal designing.

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