Upper-Bound Finite-Element Analysis of Characteristics of Critical Settlement Induced by Tunneling in Undrained Clay

2018 ◽  
Vol 18 (9) ◽  
pp. 04018110 ◽  
Author(s):  
Jian Zhang ◽  
Tugen Feng ◽  
Junsheng Yang ◽  
Feng Yang ◽  
Yufeng Gao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Upper Bound ◽  
Element Analysis

Finite Element Analysis of Composite Volleyball Upright Structures

2012 ◽  
Vol 446-449 ◽  
pp. 247-250
Author(s):  
Lu Yang Shan ◽  
Yi Shan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Static Analysis ◽  
Upper Bound ◽  
Stress Distributions ◽  
Dynamic Impact ◽  
Fe Method ◽  
Element Analysis ◽  
Impact Effect ◽  
Finite Element Software

A composite FRP volleyball upright structure is analyzed by finite element (FE) method. A static analysis is performed using commercial finite element software ANSYS. Deformation and stress distributions under regular and upper bound force (i.e., to include dynamic/impact effect) are provided. An elastic eigenvalue analysis is carried out as well to predict the buckling load and modes.

Development of a stream function-upper bound analysis applicable to the process of plate rolling

2016 ◽  
Vol 12 (2) ◽  
pp. 254-274 ◽  
Author(s):  
Amir Asgharzadeh ◽  
Siamak Serajzadeh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Velocity Field ◽  
Stream Function ◽  
Upper Bound ◽  
Deformation Zone ◽  
Deformation Pattern ◽  
Element Analysis ◽  
Content Type ◽  
Plate Rolling

Purpose – The purpose of this paper is to develop a mathematical solution to estimate the deformation pattern and required power in cold plate rolling using coupled stream function method and upper bound theorem. Design/methodology/approach – In the first place, an admissible velocity field and the geometry of deformation zone are derived from a new stream function. Then, the optimum velocity field is obtained by minimizing the corresponding power function. Also, to calculate the adiabatic heating during high speed rolling operations, a two-dimensional conduction-convection problem is sequentially coupled with the mechanical model. To verify the predictions, rolling experiments on aluminum plates are conducted and also, a finite element analysis is performed by Abaqus/Explicit. The predicted deformation zone is then compared with the experimentally measured region as well as with the results of the finite element analysis. Findings – The results show that the predicted deformation zone and the temperature distribution fit reasonably with the experimental data while much lower computational cost needs comparing to the fully finite element analysis. Originality/value – A new stream function is proposed to properly describe the velocity field and deformation pattern during plate rolling considering the neutral point. Furthermore, the employed algorithm can be simply coupled with the thermal finite element analysis.

Upper-bound finite-element analysis of axisymmetric problems using a mesh adaptive strategy

2018 ◽  
Vol 102 ◽  
pp. 148-154 ◽  
Author(s):  
Jian Zhang ◽  
Yufeng Gao ◽  
Tugen Feng ◽  
Junsheng Yang ◽  
Feng Yang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Upper Bound ◽  
Adaptive Strategy ◽  
Element Analysis ◽  
Axisymmetric Problems

Fastener Preload Guidance Methodology for ASME B16.5 Welding Neck Flanges

2008 ◽  
Author(s):  
Randy Wacker
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Upper Bound ◽  
Single System ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Flange Connection ◽  
Rules Of Thumb ◽  
Bolted Flange

Various resources have long been available from which bolted flange connection (BFC) preload guidance can be chosen. These range from Rules of Thumb gleaned from experience, to tables and charts based on average gasket stress, to parametric generalizations derived from the results of limited finite element analyses. Because the primary components of a BFC (flange, fastener and gasket) interact with one another to respond as a single system, and the system is unique to the conditions that define it, guidance based on these specific conditions will improve the accuracy of preload solutions and generate data to show the relative strengths and weaknesses of a given BFC. This paper presents a methodology that sets practical stress limits on a collection of commonly used ASME B16.5 welding neck flange components and then uses finite element analysis to solve the condition of preload that results in one or more limits being satisfied. Each preload solution is unique to the properties and geometries that define it and includes the effects of three design conditions. Fastener stress solutions include both the tension and bending components. This shows that yielding can initiate at relatively low values of preload when flange rotation is significant. Charts are created to show solution trends. This simplifies the task of identifying the component that sets the upper bound for a given solution. It also provides the basis to compare similar component combinations.

An upper-bound finite element solution for rolling of stainless steel 304L under warm and hot deformation conditions

2016 ◽  
Vol 12 (3) ◽  
pp. 514-533 ◽  
Author(s):  
P. Pourabdollah ◽  
S. Serajzadeh
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stainless Steel ◽  
Temperature Field ◽  
Upper Bound ◽  
Element Analysis ◽  
Aisi 304L ◽  
Content Type ◽  
Bound Solution ◽  
Upper Bound Solution

Purpose The purpose of this paper is to investigate the thermomechanical behavior of stainless steel AISI 304L during rolling at elevated temperatures. Design/methodology/approach Two-dimensional finite element analysis together with the upper-bound solution were used for predicting temperature field and required power in warm and hot rolling operations. The required power and heat of deformation were estimated employing an upper-bound solution based on cylindrical velocity field and at the same time, temperature distributions within the rolling steel and the work rolls were determined by means of a thermal finite element analysis. To consider the effect of flow stress and its dependence on temperature, strain and strain rate, a neural network model was used and combined with the thermal and mechanical models. Finally, the microstructure of rolled steel was studied and the effect of rolling conditions was justified employing the predictions. Findings The results have shown that the predicted temperature variations were in good agreement with the experiments. Moreover, the model was shown to be capable of determining the effects of various rolling parameters such as reduction and rolling speed with low-computational cost as well as reasonable accuracy. Originality/value A combined upper-bound finite element analysis was developed to predict the required power and temperature field during plate rolling while the model can be employed under both hot and warm rolling conditions.

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