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Search Results: 1 - 10 of 15786 matches for " Miguel Cerrolaza "
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Finite element analysis of the indentation test on rocks with microstructure
Jean Sulem,Miguel Cerrolaza
Physics , 2008,
Abstract: Strength parameters of rocks are currently determined from indentation tests. In this paper, a finite element analysis of this test is presented and scale effect is studied. The rock is modelled as an elasto-plastic medium with Cosserat microstructure and consequently possesses an internal length. The response of the indentation curve is studied for various values of the size of the indentor as compared to the internal length of the rock in order to assess the scale effect.
Un método de acople para mef - mec para análisis de interacción suelo - estructura
Rojas,Katherina; Lehmann,Lutz; Cerrolaza,Miguel;
Boletín Técnico , 2008,
Abstract: the finite element method and the boundary element method are the most used numerical tools for solid mechanics analysis. each one of these methods has advantages and drawbacks in different cases. fem is well suited for finite domains with inhomogeneous materials and non linear behaviour while bem offers advantages when dealing with infinite domains displaying homogeneous materials and linear behaviour. an iterative coupling of the finite element method and the boundary element method is presented. the domain of the problem is divided in two subdomains, where each subdomain is analyzed separately and only the interface information is exchanged between both subdomains. the assembly and solution of a general equation system is avoided, thus obtaining full advantage of the matrices characteristics, since the system of equations is symmetric in fem. numerical results compare well with other available numerical results.
Un método de acople para mef - mec para análisis de interacción suelo - estructura A fem-bem coupling method for soil - structure interaction analysis
Katherina Rojas,Lutz Lehmann,Miguel Cerrolaza
Boletín Técnico , 2008,
Abstract: El Método de los Elementos Finitos y el Método de los Elementos de Contorno son las herramientas numéricas más utilizadas para análisis en mecánica de sólidos. Cada uno de estos métodos tiene sus ventajas y desventajas en diferentes casos. El MEF es adecuado para análisis de dominios finitos con materiales no homogeneos y comportamiento no lineal, mientras que MEC ofrece ventajas en el análisis de dominios infinitos con materiales homogéneos y comportamiento lineal. En este trabajo se presenta un acople iterativo del método de los elementos finitos y el método de los elementos de contorno. El dominio del problema es dividido en dos subdominios, donde cada subdominio es analizado por separado y sólo la información en la interfase es comunicada entre los dos subdominios. El ensamble y análisis de un sistema de ecuaciones general es evitado, obteniéndose ventaja de las características de las matrices, ya que el sistema de ecuaciones en el método de los elementos finitos es simétrico.Los resultados numéricos obtenidos concuerdan satisfactoriamente con resultados obtenidos por otros autores. The Finite Element Method and the Boundary Element Method are the most used numerical tools for solid mechanics analysis. Each one of these methods has advantages and drawbacks in different cases. FEM is well suited for finite domains with inhomogeneous materials and non linear behaviour while BEM offers advantages when dealing with infinite domains displaying homogeneous materials and linear behaviour. An iterative coupling of the Finite Element Method and the Boundary Element Method is presented. The domain of the problem is divided in two subdomains, where each subdomain is analyzed separately and only the interface information is exchanged between both subdomains. The assembly and solution of a general equation system is avoided, thus obtaining full advantage of the matrices characteristics, since the system of equations is symmetric in FEM. Numerical results compare well with other available numerical results.
Localización de defectos en hueso cortical empleando el método de los elementos de contorno y algoritmos genéticos
Ojeda,David; Divo,Eduardo; Kassab,Alain; Cerrolaza,Miguel;
Boletín Técnico , 2008,
Abstract: an efficient solution for cavity detection in cortical bone, using a point load superposition technique employing the boundary element method is presented in this paper. two examples where the cavity is located using a tac is presented. results of cavity presence problems simulated using numerical experiments validate the approach in cortical bone with a single cavity.
Aplicación de la ecuación integral de contorno axisimétrica para elasticidad y termoelasticidad
González,Yomar A; Cisilino,Adrian P; Cerrolaza,Miguel E;
Boletín Técnico , 2007,
Abstract: dealing with axisymmetric problems involves a co-ordinate transformation system and additional integration process of the well-known classic boundary integral equation for 3d elasticity and thermoelasticity theories. an axisymmetric boundary element formulation is implemented in a steady-state framework for multi-domain elastic, isotropic and homogeneous problems. the fundamental solutions and their singular behaviour were taken from available literature. in order to obtain a high accuracy in the solution, employing continuous linear elements, some singular terms appearing in the boundary integral equation have been integrated analytically. several numerical examples are provided to illustrate de versatility of this approach for practical engineering problems
Análisis de problemas elásticos 2d utilizando la técnica de descomposición de dominio paralelo-iterativa y el método de los elementos de contorno
Gámez,Brizeida; Divo,Duardo; Kassab,Alain; Cerrolaza,Miguel;
Revista de la Facultad de Ingeniería Universidad Central de Venezuela , 2007,
Abstract: the boundary element method (bem) requires only a surface mesh to solve elasticity problems; however, the resulting matrices are fully-populated and non-diagonally dominant. this poses serious challenges for large-scale problems due to storage requirements and the solution of large sets of non-symmetric systems of equations. in this article, an effective and efficient domain decomposition, or artificial sub-sectioning technique, along with a region-by-region iteration algorithm particularly tailored for parallel computation to address these issues is developed. the domain decomposition approach effectively reduces the condition numbers of the resulting algebraic systems, while increasing efficiency of the solution process and decreasing memory requirements. the iterative process converges very efficiently while offering substantial savings in memory. the iterative domain decomposition technique is ideally suited for parallel computation. results demonstrate the validity of the approach by providing solutions that compare closely to single-region bem solutions and benchmark analytical solutions.
Aplicación de la ecuación integral de contorno axisimétrica para elasticidad y termoelasticidad Bem axisymmetric formulation for elasticity and thermoelasticity
Yomar A González,Adrian P Cisilino,Miguel E Cerrolaza
Boletín Técnico , 2007,
Abstract: Para el tratamiento de problemas con simetría axial, la ecuación integral de contorno para elasticidad y/o termoelasticidad en 3D sufre una transformación de coordenadas y un proceso de integración adicional para generar las soluciones axisimétricas requeridas. Este trabajo presenta la implementación de las soluciones axisimétricas para el estudio de problemas definidos en un medio elástico-lineal, isótropo, homogéneo y en régimen estacionario, en un código de Elementos de Contorno multi zona. Las expresiones analíticas de las soluciones y el desarrollo asintótico de las mismas fueron extraídas de la literatura. Para mantener un alto grado de exactitud en la solución usando elementos lineales isoparamétricos, algunos términos singulares contenidos en la ecuación integral de contorno fueron integrados analíticamente. La nueva herramienta es aplicada a diferentes ejemplos con solución analítica conocida, cotejando los resultados y comprobando la precisión y eficacia del código Dealing with axisymmetric problems involves a co-ordinate transformation system and additional integration process of the well-known classic boundary integral equation for 3D elasticity and thermoelasticity theories. An axisymmetric boundary element formulation is implemented in a steady-state framework for multi-domain elastic, isotropic and homogeneous problems. The fundamental solutions and their singular behaviour were taken from available literature. In order to obtain a high accuracy in the solution, employing continuous linear elements, some singular terms appearing in the boundary integral equation have been integrated analytically. Several numerical examples are provided to illustrate de versatility of this approach for practical engineering problems
Localización de defectos en hueso cortical empleando el método de los elementos de contorno y algoritmos genéticos Locating defects in cortical bone using the boundary element method and genetic algorithms.
David Ojeda,Eduardo Divo,Alain Kassab,Miguel Cerrolaza
Boletín Técnico , 2008,
Abstract: Se presenta una solución eficiente para la detección de cavidades en hueso cortical a partir de una técnica de superposición de cargas puntuales empleando el método de elementos de contorno. Se muestran dos ejemplos donde se logra la detección de una cavidad a partir de una imagen tomográfica de un hueso cortical, validándose la solución a partir de resultados numéricos experimentales usando el Método de los Elementos de Contorno. An efficient solution for cavity detection in cortical bone, using a point load superposition technique employing the boundary element method is presented in this paper. Two examples where the cavity is located using a TAC is presented. Results of cavity presence problems simulated using numerical experiments validate the approach in cortical bone with a single cavity.
Dise?o y fabricación de una celda de carga para mediciones fisiológicas en distracción alveolar
Carrero Toro,Wilmer A; Romero,; Cede?o,José Adolfo; Cerrolaza,Miguel; Navarro,Tania;
Acta Odontológica Venezolana , 2009,
Abstract: a key aspect involved in the mechanical design of alveolar distractor is the accurate evaluation of physiological loading for computer simulation. very few information and previous work are available about this subject. a stainless steel load cell having strain gauges has been developed and manufactured. this cell was attached to a splint, like those used in orthodontia. the load cell was calibrated and then an ?in vivo? test was carried out on a partially-edentulous patient. digital registers of load were obtained for three cases: tongue protrusion, lower lips retraction and a combination of both
Dise o y fabricación de una celda de carga para mediciones fisiológicas en distracción alveolar Design and manufacturing of a load-cell for physiological measuring in alveolar distraction
Wilmer A Carrero Toro,Romero,José Adolfo Cede?o,Miguel Cerrolaza
Acta Odontológica Venezolana , 2009,
Abstract: Un factor de vital importancia para el dise o mecánico de distractor osteogénico alveolar es el conocimiento de las cargas fisiológicas para la simulación computacional, existe muy poca información o trabajos previos sobre este tema. Para obtener estas cargas, ha sido desarrollada una celda de carga constituida de una lámina de acero inoxidable en voladizo instrumentada con galgas extensométricas, la cual ha sido empotrada en una férula como la usada en tratamientos de ortodoncias. Luego de calibrar la celda de cargas fisiológicas, se realizó un ensayo in vivo sobre un paciente parcialmente edéntulo del maxilar inferior, obteniéndose registros digitales de cargas para diferentes condiciones de protrusión de la lengua, retracción del labio inferior y la combinación de ambas A key aspect involved in the mechanical design of alveolar distractor is the accurate evaluation of physiological loading for computer simulation. Very few information and previous work are available about this subject. A stainless steel load cell having strain gauges has been developed and manufactured. This cell was attached to a splint, like those used in orthodontia. The load cell was calibrated and then an “in vivo” test was carried out on a partially-edentulous patient. Digital registers of load were obtained for three cases: tongue protrusion, lower lips retraction and a combination of both
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