scholarly journals Research on the Geostatic Stress Field Procedure under Complex Conditions

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Xue-yan Wang ◽  
Yi-li Yuan ◽  
Chang-ming Hu ◽  
Yuan Mei
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Stress Field ◽  
Theoretical Basis ◽  
Geotechnical Engineering ◽  
Comparison Study ◽  
Traditional Methods ◽  
Complex Condition ◽  
Simulation Results

Geostatic stress field procedure is the first and the most important step for the numerical simulation of geotechnical engineering, which greatly influences the simulation results. Traditional methods often fail when the model is complex. In this paper, based on finite element method (FEM) software ABAQUS, failure reasons of four commonly used methods for the geostatic stress field are studied. According to the analysis results, a new set of methods, which can provide reasonable displacement and stress field results under complex conditions, is proposed. The proposed methods follow the principle that the stress of different materials should be obtained separately to avoid stress distortion. Then, the accuracy and applicability of the proposed method are verified through a comparison study and a specific application. This study provides a theoretical basis for the method of geostatic stress field procedure under complex condition and can serve as a reference for relevant studies.

A study of azimuthal electromagnetic wave LWD based on self-adaptive hp finite element method

2018 ◽  
Vol 32 (34n36) ◽  
pp. 1840073
Author(s):  
Hui Li ◽  
Yi-Bo Jiang ◽  
Jian-Wen Cai
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Electromagnetic Wave ◽  
Real Time ◽  
Simulation Results ◽  
Peak Value ◽  
Element Method ◽  
Self Adaptive ◽  
Hp Finite Element

Azimuthal electromagnetic wave logging-while-drilling (LWD) technology can detect weak electromagnetic wave signal and realize real-time resistivity imaging. It has great values to reduce drilling cost and increase drilling rate. In this paper, self-adaptive hp finite element method (FEM) has been used to study the azimuthal resistivity LWD responses in different conditions. Numerical simulation results show that amplitude attenuation and phase shift of directional electromagnetic wave signals are closely related to induced magnetic field and azimuthal angle. The peak value and polarity of geological guidance signals can be used to distinguish reservoir interface and achieve real-time geosteering drilling. Numerical simulation results also show the accuracy of the self-adaptive hp FEM and provide physical interpretation of peak value and polarity of the geological guidance signals.

The Numerical Simulation of Effective Elastic Response for WC-Co Cemented Carbide

2015 ◽  
Vol 1096 ◽  
pp. 417-421
Author(s):  
Pei Luan Li ◽  
Zi Qian Huang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Model ◽  
Material Properties ◽  
Cemented Carbide ◽  
Elastic Response ◽  
The Finite Element Method ◽  
Simulation Results ◽  
Element Method

By the use of finite element method, this paper predicts the effects of the shapes of reinforcements with different ductility (Co) on the effective elastic response for WC-Co cemented carbide. This paper conducts a comparative study on the material properties obtained through theoretical model, numerical simulation and experimental observations. Simulation results indicate that the finite element method is more sophisticated than the theoretical prediction.

Numerical Simulation on Hydrogen Dispersion in Automobiles due to Storage Cylinder Failure

2011 ◽  
Author(s):  
Yan-Lei Liu ◽  
Jin-Yang Zheng ◽  
Shu-Xin Han ◽  
Yong-Zhi Zhao
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Model ◽  
Hydrogen Sensor ◽  
High Concentration ◽  
Concentration Region ◽  
Species Transport ◽  
Safety Design ◽  
Simulation Results

A numerical model for dispersion of hydrogen in hydrogen powered automobiles was established basing on finite element method with species transport and reaction module of FLUENT. And corresponding numerical simulations were done in order to analysis the dispersion of hydrogen due to leakage from different position of the storage cylinder on the automobiles. Also, the distribution of the hazard region due to hydrogen dispersion was obtained. The simulation results show that the baffle above the cylinder can accumulate the hydrogen. Therefore, the high concentration region of hydrogen exists near the baffle. The study can provide reference for hydrogen sensor placement and safety design of hydrogen powered automobiles.

Numerical Simulation for Precision Roll-Forging of Automobile Front Axle

2012 ◽  
Vol 602-604 ◽  
pp. 1850-1854 ◽  
Author(s):  
Ru Xiong Li ◽  
Song Hua Jiao
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Front Axle ◽  
Die Design ◽  
Time Curve ◽  
Forging Process ◽  
Simulation Results ◽  
Force Time ◽  
Element Method

Roll forging process for automobile front axle has been simulated by using a rigid viscoplastic finite element method, force-time curve have been obtained and analyzed. On the basis of simulation result, typical characteristics of roll forging process have been explained. It concluded that simulation results could guide the development of roll forging and die design for automobile front axle.

Numerical Simulation of the Effects of Cell Size on the Mechanical Property of Microcellular Polypropylene

2011 ◽  
Vol 189-193 ◽  
pp. 57-61 ◽  
Author(s):  
Wei Gong ◽  
Chun Zhang ◽  
Jie Yu ◽  
Ying He ◽  
Li He
Keyword(s):  
Numerical Simulation ◽  
Mechanical Property ◽  
Finite Element Method ◽  
Finite Element ◽  
Cell Size ◽  
Plane Stress ◽  
Tensile Deformation ◽  
Uniform Size ◽  
Deformation Processes ◽  
Simulation Results

The tensile model of foams is built using UG software and the tensile deformation processes of microcellular polypropylene foams with different cell sizes are simulated using finite element method (FEM). The effect of cell size on mechanical property is evaluated based on the microstructure of the foams. The cells with small and uniform size are in a state of plane stress, which improved effectively mechanical property of the foams. Whereas the cells with large and nonuniform size are in a state of plane strain, which leads to low mechanical property. The simulation results coincide well with experimental results.

Seal Analysis and Optimization of Large Diameter Gate Valve Based on ANSYS

2013 ◽  
Vol 415 ◽  
pp. 498-501 ◽  
Author(s):  
Shu Xun Li ◽  
Lian Cui Li ◽  
Ying Zhe Hou
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Theoretical Calculation ◽  
Circular Plate ◽  
Theoretical Basis ◽  
Gate Valve ◽  
Large Diameter ◽  
The Finite Element Method ◽  
Simply Supported

Aiming at the leakage problem on the top of gate valve, the finite element method is used to analyze the gate valves seal face and body, as well as the distributing laws of the stress, deformation and seal pressure are obtained. The shutter is simplified as the circular plate simply supported on the whole circle, and the gate valve is optimized according to the relevant formula to meet sealing requirement. The results show that: the combination of the numerical simulation and theoretical calculation, not only the more accurate theoretical basis for the optimization of the large diameter gate valve can be provided, but also the time of the development and design can be shorten greatly.

Optimization and Numerical Simulation of Locking Mechanism

2014 ◽  
Vol 494-495 ◽  
pp. 725-728
Author(s):  
De Yong Cai ◽  
Fu Jun Liu ◽  
Gong Min Tang
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Model ◽  
The Finite Element Method ◽  
Working Process ◽  
Optimization Result ◽  
Locking Mechanism ◽  
Design Requirements ◽  
Simulation Results

The mechanical model of a new spring locking mechanism was established. The optimum spring parameters of the locking mechanism which meet the design requirements were provided by optimization. Using the finite element method, numerical simulation of working process of the locking mechanism was carried out. The rationality of optimization result was verified by simulation results of numerical simulation.

Research on Numerical Simulation of Quad Bundle Conductor on Galloping

2013 ◽  
Vol 457-458 ◽  
pp. 23-27
Author(s):  
Xue Ping Zhan ◽  
Kuan Jun Zhu ◽  
Cao Lan Liu ◽  
Bin Liu ◽  
Jun Zhang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Numerical Results ◽  
Kutta Method ◽  
Aerodynamic Parameter ◽  
Runge Kutta Method ◽  
Simulation Results ◽  
Runge Kutta ◽  
Element Method

The models of the multi-bundled conductors are constructed by finite element method in this paper. The numerical results are given by using the 4th order Runge-Kutta method considering aerodynamic parameter of sub-conductor. The simulation results are obtained on galloping of quad bundle conductors with the different span. Thus some effective numerical results of quad twin bundle conductor can provide a useful reference for anti-galloping design.

A Planar Dielectrophoretic Microdevice for Particle Manipulation

2008 ◽  
Vol 47-50 ◽  
pp. 153-156
Author(s):  
Q.Z. Teng ◽  
Xian Zhou Zhang ◽  
Wei Hua Li ◽  
Da Feng Chen ◽  
He Jun Du
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Particle Motion ◽  
Surrounding Medium ◽  
Electrode Array ◽  
Particle Manipulation ◽  
Interdigitated Electrode ◽  
Simulation Results

This paper presents both theoretical and experimental study of particle motion in a typical interdigitated electrode array. Both finite element method and numerical simulation were performed to predict the movement of particles. The simulation results indicated that the particle motion and separation behaviors strongly depend on the combined contributions of a number of parameters, such as the frequency of the electric field, applied voltage, dielectric properties of the particles and the surrounding medium.

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