Avances en el uso de simulaciones computacionales para comprender mejor los efectos biomecánicos del glaucoma

2021 ◽  
Author(s):  
◽  
L. M. Rosales Medina
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Intraocular Pressure ◽  
Review Article ◽  
The Finite Element Method ◽  
Computational Simulations ◽  
Knowing That ◽  
Biomechanical Changes ◽  
Main Effects ◽  
Made In

The use of computational simulations using the finite element method is a useful tool to observe the effects that intraocular pressure causes on some structures of the eye. Both, the simulations that focus on analyzing the anterior and posterior poles provide data about changes that occur having certain pressure values. Even knowing that the main effects of primary angle glaucoma are palpable in the optic nerve, the usefulness of the results obtained from simulations that focus on studying the cornea or other structures is not ruled out, since these are structures affected since that is where it originates in a glaucoma disease beginning. This review article tries to cover some of the articles focused on computational simulations of the eye and its biomechanical changes due to glaucoma in recent years, as well as to review the considerations that were made in each one to arrive at their respective results.

A Discussion on natural strain and geological structure - The finite element method and the solution of some geophysical problems

1976 ◽  
Vol 283 (1312) ◽  
pp. 139-151 ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Geological Structure ◽  
The Finite Element Method ◽  
Recent Developments ◽  
Limited Application ◽  
Discrete Problems ◽  
The Finite Difference Method ◽  
Made In ◽  
Element Method

The finite element method has become established as a powerful tool for the solution of many problems of continuum mechanics where its physical interpretation, by analogy with discrete problems of structural analysis permits the user to exercise a considerable degree of insight and judgement in its use. Further it is now a recognized mathematical procedure of approximation which embraces many older methodologies (such as the finite difference method) as a subclass. In the field of geological studies its impact is fairly recent and only a limited application has been made to date. The techniques used here have been limited to those established over a decade ago in the parallel fields and recent developments and possibilities barely touched upon. In this paper the author therefore attempts to ( a ) outline some of the general mathematical and practical aspects of the method with illustrations from various fields which are relevant to geological problems, ( b ) survey accomplishments already made in geology and geotechnical fields, and ( c ) suggest some possible new extensions of application.

Analysis of Stress and Prediction of the Defects of an Ankle Prosthesis Using the Autodesk Inventor Software

2019 ◽  
Vol 70 (6) ◽  
pp. 1942-1946
Author(s):  
Stefan-Catalin Popescu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Simulation Software ◽  
The Finite Element Method ◽  
Safety Factors ◽  
Ankle Prosthesis ◽  
Failure Theory ◽  
Von Mises ◽  
Alloy 6061 ◽  
Made In

The paper presents stress analysis of an ankle prosthesis and the prediction of the cracks appearance that may occur using the finite element method. The first test was performed using as material for the ankle prosthesis simulation, aluminium alloy 6061, and in the second test were use titanium as the simulation material. Von Mises�s basic concept, failure theory, is also analysed, using Autodesk Inventor simulation software, in an attempt to give a perspective on the material from which the ankle prosthesis must be made. In conclusions were presented results for stress, endurance, and safety factors for simulated prosthesis.

A Design Methodology for Tracked Vehicles Using Experimentally Identified Modal Parameters and the Finite Element Method

1994 ◽  
Author(s):  
M. K. Sarwar ◽  
A. A. Shabana ◽  
Toshikazu Nakanishi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Design Methodology ◽  
Element Model ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Tracked Vehicle ◽  
Made In ◽  
Element Method

Abstract The objective of this study is to develop a design procedure that integrates multibody techniques, the finite element method, and experimental modal analysis techniques. Multibody techniques and the finite element method are first used to develop and numerically test the performance of the proposed design. Based on this computer analysis, a prototype model can be built. The vibration modal parameters of this model can be determined experimentally and used with general purpose multibody computer programs to evaluate the performance of the design. The obtained numerical results can be compared with the results obtained previously using multibody techniques and the finite element method. Adjustments can then be made in the finite element description in order to obtain a more realistic model that compares well with the experimental data. Using the more realistic finite element model, design modifications can be made in order to improve the performance of the design model. The use of the design methodology proposed in this paper is demonstrated using a flexible tracked vehicle model that consists of fifty four interconnected bodies. In this model, the nonlinear contact forces that describe the interaction between the track links and the vehicle components and the ground are developed. The nonlinear dynamic equations of the vehicle are developed in terms of a coupled set of reference and chassis elastic modal coordinates. The flexibility of the chassis of the tracked vehicle is described using the finite element method and experimentally identified modal parameters. The results obtained using the finite element model are compared with the results obtained using experimentally identified modal parameters.

scholarly journals New Constitutive Matrix in the 3D Cell Method to Obtain a Lorentz Electric Field in a Magnetic Brake

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3185 ◽  
Author(s):  
José Monzón-Verona ◽  
Pablo González-Domínguez ◽  
Santiago García-Alonso
Keyword(s):  
Magnetic Field ◽  
Finite Element Method ◽  
Finite Element ◽  
Computer Applications ◽  
The Finite Element Method ◽  
Cell Method ◽  
Hall Sensors ◽  
Constitutive Matrix ◽  
The Magnetic Field ◽  
Made In

In this work, we have obtained a new constitutive matrix to calculate the induced Lorentz electric current of in a conductive disk in movement within a magnetic field using the cell method in 3D. This disk and a permanent magnet act as a magnetic brake. The results obtained are compared with those obtained with the finite element method (FEM) using the computer applications Getdp and femm. The error observed is less than 0.1173%. Likewise, a second verification has been made in the laboratory using Hall sensors to measure the magnetic field in the proximity of the magnetic brake.

Examination of a Cargo Space of a Freight Wagon Modified with Composite Panels

2015 ◽  
Vol 809-810 ◽  
pp. 944-949 ◽  
Author(s):  
Andrzej Buchacz ◽  
Andrzej Baier ◽  
Krzysztof Herbuś ◽  
Michał Majzner ◽  
Piotr Ociepka
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Composite Materials ◽  
Steel Sheet ◽  
Composite Panels ◽  
Virtual Model ◽  
The Finite Element Method ◽  
Natural Size ◽  
The Given ◽  
Made In

This article presents the method of solving the problem considered with the too fast wearing of a steel sheet paneling of a freight wagon body. The method, described in the work, bases on the use of additional components, which are made of composite materials. The proposed solution is based on the appropriate lining of the inside of a wagon body with composite panels. In order to verify the placing and fixing of composite panels to wagon walls, as well as to verify the behavior of joined composite panels in the given conditions of a wagon work it was used a computer analysis basing on the finite element method. Because of the scale of the analyzed problem it was also created a virtual model of the research stand, which allows experimentally verifying phenomena occurring between the joined composite panels mounted on walls of a freight wagon that is made in a natural size. Carried out researches allowed determining the method of arrangement the composite panels in the inside space of a freight wagon body. It was also determined the method of panels joining and the method of their fixing to the steel paneling of a wagon body. It was also determined the procedure of transferring the results of the experimental analysis of the wagon walls, made in a natural size, on a real object using the matching of a virtual model.

scholarly journals Areas of Contact and Pressure Distribution in Bolted Joints

1972 ◽  
Vol 94 (3) ◽  
pp. 864-870 ◽  
Author(s):  
H. H. Gould ◽  
B. B. Mikic
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Pressure Distribution ◽  
Experimental Methods ◽  
Bolted Joints ◽  
The Other ◽  
Elastic Plates ◽  
The Finite Element Method ◽  
Linear Elastic ◽  
Made In

The pressure distribution in the contact zones and the radii at which flat and smooth axisymmetric, linear elastic plates will separate were computed for several thicknesses as a function of the configuration of the bolt load by the finite element method. The radii of separation were also measured by two experimental methods. One method employed autoradiographic techniques. The other method measured the polished area around the bolt hole of the plates caused by sliding under load in the contact zone. The computational and experimental results are in agreement and these yield smaller zones of contact than indicated by the literature. It is shown that the discrepancy is due to an assumption made in the previous analyses.

A Practical Introduction to Finite Element Analysis of Electromagnetic Problems

1994 ◽  
Vol 31 (2) ◽  
pp. 155-166
Author(s):  
R. Chedid
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Graduate Students ◽  
The Finite Element Method ◽  
Element Analysis ◽  
Electromagnetic Problems ◽  
Fortran Code ◽  
Made In ◽  
Element Method

A practical introduction to finite element analysis of electromagnetic problems An attempt is made in this paper to bring the finite element method to a wider audience of undergraduate and graduate students through an approach that focuses on the design of the preprocessor, the solver and the postprocessor. Typical Fortran code is cited to illustrate the elegance of the method.

Estimating the Life-Cycle of the Medical Implants Made by SLM Titanium-Alloyed Materials Using the Finite Element Method

2013 ◽  
Vol 371 ◽  
pp. 478-482 ◽  
Author(s):  
Razvan Păcurar ◽  
Ancuţa Păcurar ◽  
Nicolae Bâlc ◽  
Anna Petrilak ◽  
Ladislav Morovič
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Medical Implants ◽  
The Finite Element Method ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
First Time ◽  
Made In ◽  
Element Method

Within this article, there are presented a series of researches that were developed for the first time in Romania, in the field of customized medical implants made by using the Selective Laser Melting (SLM) technology. Finite Element Method (FEM) has been successfully used in order to analyze the fatigue and to determine the durability of a customized medical implant that has been selected for the made analysis. The material characteristics taken into consideration within the Finite Element Analysis (FEA) that has been performed were the ones of two types of dedicated metallic powders which are commercially available (TiAl6Nb7 and TiAl6V4 material) and suitable for the SLM 250 HL equipment from the SLM Solutions GmbH Company from Lubeck, Germany. The Finite Element Analysis made in the case of these two types of SLM titanium alloyed materials, proved that the modified characteristics, such as the yield strength and hardness of the material are significantly influencing the durability of the medical implants made by SLM technology.

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