Stress Variation in the Orthodontic Tipping Phenomenon Analysis through the finite element method

2018 ◽  
Vol 69 (8) ◽  
pp. 1992-1995
Author(s):  
Dan Dragos Sita ◽  
Ligia Brezeanu ◽  
Cristina Bica ◽  
Dana Manuc ◽  
Edwin Sever Bechir ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Alveolar Bone ◽  
Complex Structure ◽  
External Action ◽  
The Finite Element Method ◽  
Stress Variation ◽  
Orthodontic Bracket ◽  
Method Analysis ◽  
Element Method

The purpose of the study is to assess through a FEM (Finite Element Method analysis), the behavior of a complex structure (enamel-tooth-alveolar bone-periodontal ligament-pulp), subjected to an external load through an orthodontic bracket-with forces of various intensities and to determine its influence on the entire structure.It is necessary to analyze the way all elements of the structure take over the external action given by the action of an orthodontic appliance through the brackets and the influence on the inner component -the pulp-inside of which there are the nerve endings.

Impact Damage Analysis and Experimental Test of Carbon/Epoxy Composite Laminate

2015 ◽  
Vol 1120-1121 ◽  
pp. 590-592
Author(s):  
Hyoh Yun Choi ◽  
Yeon Jun Lim ◽  
Hyun Jun Cho ◽  
Hyun Bum Park
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Laminate ◽  
Impact Analysis ◽  
Impact Damage ◽  
The Finite Element Method ◽  
Fem Model ◽  
The Impact ◽  
Method Analysis ◽  
Element Method

In this work, study on impact damage FEM model of composite structure was performed. From the finite element method analysis results of composite laminate, it was confirmed that the results of analysis was reasonable. The velocity of impactor to initiate damage was estimated, and in order to investigate the damage at the predicted velocity, impact analysis using finite element method was performed. According to the impact analysis results of composite laminate, it was confirmed that the damage was generated at the estimated impact velocity. Finally, the comparison of the numerical results with those measured by the experiment showed good agreement.

A Transient Thermoelastohydrodynamic Study of Steadily Loaded Plain Journal Bearings Using Finite Element Method Analysis

1999 ◽  
Vol 122 (1) ◽  
pp. 219-226 ◽  
Author(s):  
Bogdan-Radu Kucinschi ◽  
Michel Fillon ◽  
Jean Fre^ne ◽  
Mircea D. Pascovici
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Journal Bearing ◽  
Journal Bearings ◽  
The Finite Element Method ◽  
Thermal Boundary Conditions ◽  
Theoretical Predictions ◽  
Start Ups ◽  
Method Analysis ◽  
Element Method

The present paper proposes an advanced bidimensional model necessary to calculate the temperature field in a journal bearing submitted to both rapid and slow start-ups. The model takes into account realistic thermal boundary conditions at fluid film-solid interfaces. The thermoelastic deformations of both the journal and of the bush are also considered and a special attention is paid to the ruptured zone of the film. The Finite Element Method (with upwind techniques whenever necessary) is employed to solve the equations implied by the model. Finally, the theoretical predictions were validated by comparison with experimental data. [S0742-4787(00)02701-6]

scholarly journals The veining structure method, the finite element method in thermal deformation determination for the main spindle at numerical control lathes

2005 ◽  
Vol 9 (1) ◽  
pp. 99-110
Author(s):  
Adrian But ◽  
Ioan Luminosu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Complex Structure ◽  
Numerical Control ◽  
Initial Structure ◽  
The Finite Element Method ◽  
Thermal Deformations ◽  
Cnc Lathe ◽  
Main Spindle ◽  
Element Method

In the determination of the process accuracy on computer numerical control (CNC) lathe [1] it is very important to know the thermal deformations. This article presents a new solution to obtain the thermal deformations at the principal arbor (the most important part of a principal actuation for a CNC lathe) by using the element finite method. The first part of the theoretical aspect presents the steps of this method used especially for the principal arbor. The experimental part presents how this method was used to measure and process the signals. The experimental tests were applied in two different situations: (a) when material was catch only in principal arbor, and (b) when material was catch in principal arbor and chuck. The NASTRANMSC program was used, which has the possibility to determine the temperature values in the whole mass of the principal arbor and later the deformation temperature of every point of the ensemble was obtained. In order to analyze the thermal strain influence on the main spindle, the finite element method, the veining structure of a body was used. This is a method through which the "mother" (complex) structure was split in composing parts considered as independent (substructures). The link between different substructures in which the complex structure was split, is made on the common contour of substructures. The substructure becomes this way an independent structure with edge condition, constraint by assembly continuity of initial structure.

scholarly journals AN EXAMPLE OF USING FEM FOR AIR FLOW ANALYSIS THROUGH AIRCRAFT AREAL INJECTOR

Aviation ◽  
2006 ◽  
Vol 10 (2) ◽  
pp. 13-16
Author(s):  
Adam Konieczny
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Flow Parameter ◽  
Flow Analysis ◽  
State Committee ◽  
Air Distribution ◽  
Geometrical Parameters ◽  
The Finite Element Method ◽  
Method Analysis ◽  
Element Method

In the article an example of using the Finite Element Method to determine the air distribution that is used in the atomization of fuel by the aerial injector is presented. In detail, Finite Element Method analysis appeared to be helpful in verifying the geometrical parameter of the injector – the two‐flow parameter. The Finite Element Method results data of airflow distributions at the end of sections of an aerial injector allows a real geometric parameter to be verified. Full information about this parameter has shown the need to change other geometrical parameters. This work was made within the framework of a research project financed by State Committee for Scientific Research no. 5T12D 027 24.

Analysis of Sealing Properties of Coupled Gas Film Flow Field and Cantilever-Type Foil Deformation

2014 ◽  
Vol 670-671 ◽  
pp. 856-859
Author(s):  
Gang Ma ◽  
Yun Long Du
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Steady State ◽  
The Finite Element Method ◽  
Analysis Model ◽  
The Impact ◽  
Method Analysis ◽  
Fluid Solid Interaction ◽  
Steady State Performance ◽  
Element Method

Aimed at cantilever-type foil cylinder film seal system, finite element method analysis model was established to calculate the deformation of cantilever foil under the gas pressure based on the theory of plate bending. The paper proposed a method to solve fluid-solid interaction problems in cantilever-type foil cylinder film seal system based on the numerical analysis method of cylinder gas film seal. The calculation program using the finite element method to solve fluid-solid interaction problems was developed. Calculation simulation of the film mechanical properties and steady-state performance of sealing system was realized which improved the accuracy of the sealing system performance analysis and provided the basis for the multi-parameters matching design of sealing system. The impact of adding cantilever foil support structure to the steady-state performance of sealing system and the influence of flexible support parameters on the steady-state performance of the sealing system was calculated through the method.

Using the Finite Element Method Analysis of Tianjin 112 State Line Road Soft Soil Subgrade

2014 ◽  
Vol 501-504 ◽  
pp. 372-375
Author(s):  
Xiao Cheng Su ◽  
Hai Zhen Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Coupling Effect ◽  
Soft Soil ◽  
Composite Foundation ◽  
The Finite Element Method ◽  
Nonlinear Characteristics ◽  
Foundation Pile ◽  
Method Analysis ◽  
Element Method

By using the finite element method we had studied the Tianjin Expressway Subgrade Settlement.Through the comparison of the reinforcement and the unreinforced two case we studied the principles of strengthening soft soil subgrade and results show that the mixing pile to improve the bearing capacity of the embankment foundation, reduce the settlement of foundation has played a very good role.The finite element method can reflect the nonlinear characteristics of the coupling effect between composite foundation pile, soil and the soil around the pile, the soil using elastoplastic model, and considering the different medium, different distribution,which has great advantages in the analysis of various factors.The finite element method can better reflect the reinforcement of soft soil subgrade.So ,it also can optimize the engineering design.

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