scholarly journals A Hybrid Molecular Dynamics/Atomic-Scale Finite Element Method for Quasi-Static Atomistic Simulations at Finite Temperature

2013 ◽  
Vol 81 (5) ◽  
Author(s):  
Ran Xu ◽  
Bin Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Temperature ◽  
Simulation Method ◽  
Atomic Scale ◽  
Atomistic Simulations ◽  
Single Wall Carbon Nanotubes ◽  
Equilibrium Configurations ◽  
Quasi Static Process ◽  
Element Method

In this paper, a hybrid quasi-static atomistic simulation method at finite temperature is developed, which combines the advantages of MD for thermal equilibrium and atomic-scale finite element method (AFEM) for efficient equilibration. Some temperature effects are embedded in static AFEM simulation by applying the virtual and equivalent thermal disturbance forces extracted from MD. Alternatively performing MD and AFEM can quickly obtain a series of thermodynamic equilibrium configurations such that a quasi-static process is modeled. Moreover, a stirring-accelerated MD/AFEM fast relaxation approach is proposed in which the atomic forces and velocities are randomly exchanged to artificially accelerate the “slow processes” such as mechanical wave propagation and thermal diffusion. The efficiency of the proposed methods is demonstrated by numerical examples on single wall carbon nanotubes.

scholarly journals Elastic Properties of Boron-Nitride Nanotubes through an Atomic Simulation Method

2015 ◽  
Vol 2015 ◽  
pp. 1-5 ◽  
Author(s):  
Jixiao Tao ◽  
Guangmin Xu ◽  
Yuzhou Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Boron Nitride ◽  
Young’S Modulus ◽  
Elastic Properties ◽  
Simulation Method ◽  
Boron Nitride Nanotubes ◽  
Atomic Scale ◽  
Atomic Simulation ◽  
Element Method

The elastic properties of the boron-nitride nanotubes are studied based on an atomic simulation method that is called atomic-scale finite element method. The Tersoff-Brenner potential is used to describe the interaction between boron and nitrogen atoms, and the computational method is established in an atomic-scale scheme similar to the classical finite element method. Young’s modulus is evaluated for the boron-nitride nanotubes, and their buckling behavior is analyzed. It is shown that the diameter has an obvious influence on Young’s modulus of BNNTs, and the buckling is little related to the length of the nanotubes.

scholarly journals Analysis of Vertical Stiffness of Air Spring Based on Finite Element Method

2018 ◽  
Vol 153 ◽  
pp. 06006
Author(s):  
Jiatong Ye ◽  
Hua Huang ◽  
Chenchen He ◽  
Guangyuan Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Simulation ◽  
Element Model ◽  
Simulation Method ◽  
Bench Test ◽  
Air Spring ◽  
Vertical Stiffness ◽  
Element Simulation ◽  
Element Method

In this paper, a finite element model of membrane air spring in the vehicle is established, and its vertical stiffness characteristics under a certain inflation pressure are analysed. The result of finite element simulation method is compared with the result of the air spring bench test. The accuracy and reliability of the finite element simulation method in nonlinear analysis of air spring system are verified. In addition, according to the finite element method, the influence of the installation of the air spring limit sleeve on its stiffness is verified.

The Inverse Prediction for Profile Extrusion Die Based on the Finite Element Method

2014 ◽  
Vol 941-944 ◽  
pp. 2332-2335 ◽  
Author(s):  
Min Zhang ◽  
Chuan Zhen Huang ◽  
Yu Xi Jia ◽  
Jin Long Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Polymer Melt ◽  
Simulation Method ◽  
Extrusion Process ◽  
The Finite Element Method ◽  
Polymer Extrusion ◽  
Extrudate Swell ◽  
Extrusion Die ◽  
Element Method

Considering the extrudate swell, the polymer extrusion process was calculated by the inversed simulation based on the visco-elastic ecology theory. The fluid characteristics of the polymer melt were described by the Phan-Thien and Tanner (PTT) model. The Finite Element Method was used. Based on the simulation data, the extrusion die lips were analyzed. So it is feasible to design the polymer extrusion die lips using inversed simulation method.

scholarly journals Finite element analysis on permeability of cut-off wall for landfill

2021 ◽  
Vol 10 (1) ◽  
pp. 59
Author(s):  
Guozhong Dai ◽  
Jiajing Xu ◽  
Shujin Li ◽  
Xiongwei Li ◽  
Guicai Shi ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Information Technology ◽  
Finite Element ◽  
Simulation Method ◽  
National Standard ◽  
The Finite Element Method ◽  
Seepage Velocity ◽  
Element Analysis ◽  
Numerical Calculation Method ◽  
Element Method

<p><span>Finite element method is an efficient numerical calculation method based on information technology, which can be used to solve complex equations in various problems. At present, the finite element method is mainly used to deal with seepage problems in dams, while there is less study on seepage in landfill. In this paper, finite element method is used to analyze the seepage of cut-off wall of a landfill in Jiangsu Province, and the movement of landfill leachate in cut-off wall under different conditions is simulated. The simulation results show that The cut-off wall can effectively slow down the seepage velocity of leachate; Under different conditions, the maximum gradient of the cut-off wall are 18.68 and 13.84 respectively, which conforms to Chinese national standard. Therefore, the design of cut-off wall is safe and reasonable, and filtration erosion will not occur; This simulation method combined with information technology can provide new solutions and ideas for other projects to verify safety and rationality.</span></p>

Mechanical Behavior of Atoms Using Atomic-scale Finite Element Method

2015 ◽  
Author(s):  
Daniela Andrade Damasceno Damasceno ◽  
Nimal Rajapakse Rajapakse ◽  
Euclides Mesquita Mesquita
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Behavior ◽  
Atomic Scale ◽  
Element Method

Research on the Process of Numerical Control Electrochemical Turning Based on Finite Element Method

2013 ◽  
Vol 764 ◽  
pp. 95-101 ◽  
Author(s):  
Xiu Qing Fu ◽  
Jie Yu Xian ◽  
Min Kang ◽  
Mao Hua Xiao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Current Density Distribution ◽  
Simulation Method ◽  
Numerical Control ◽  
Percentage Error ◽  
Analysis Model ◽  
Electrochemical Turning ◽  
Element Method

The processing simulation method of numerical control electrochemical turning (NC-ECT) was presented based on the finite element method (FEM) in this paper. The three-dimensional analysis model of the electric field built in ANSYS software was solved. The current density distribution and the theoretical values of material removed depth per revolution (MRDPR) in different time on the anode were obtained. The experiments were carried out on the NC-ECT lathe, and the measured values of MRDPR were measured, which were compared with the theoretical values. It is indicated that the maximum percentage error between the theoretical values and the measured values is smaller and the simulation method meets the accuracy of the engineering calculations.

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