Recursos de colección

Archivo Digital UPM (115.086 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Materia = Materiales

Mostrando recursos 1 - 15 de 15

  1. Aporte martensíticos en la soldadura de aceros 9%Cr

    Oñoro Lopez, Javier; Portolés García, Antonio; Ibars Almonacil, Jose Ramón
    Los aceros 9% en cromo son utilizados en plantas de producción de energía eléctrica debido a su elevada resistencia a la corrosión, buenas propiedades mecánicas y resistencia a la termofluencia. Estos aceros presentan una estructura completamente martensítica. Sin embargo, la realización de uniones soldadas los hace susceptibles a la aparición en la zona fundida de ferrita delta, que reduce sus propiedades de termofluencia y tenacidad. Este trabajo analiza la microestructura del metal de aporte producido durante la soldadura manual con electrodo consumible (SMAW) utilizando aportes con diferentes composiciones en cromo y otros elementos de aleación como molibdeno, wolframio, cobre y...

  2. Techniques to accelerate convergence of stress-controlled molecular dynamics simulations of dislocation motion

    Cereceda, D.; Perlado Martín, José Manuel; Marian, Jaime
    Dislocation mobility —the relation between applied stress and dislocation velocity—is an important property to model the mechanical behavior of structural materials. These mobilities reflect the interaction between the dislocation core and the host lattice and, thus, atomistic resolution is required to capture its details. Because the mobility function is multiparametric, its computation is often highly demanding in terms of computational requirements. Optimizing how tractions are applied can be greatly advantageous in accelerating convergence and reducing the overall computational cost of the simulations. In this paper we perform molecular dynamics simulations of ½ 〈1 1 1〉 screw dislocation motion in tungsten...

  3. Conceptual design of the liquid metal laboratory of the TECHNOFUSION facility

    Abánades Velasco, Alberto; García, A.; Casal, N.; Perlado Martín, José Manuel; Ibarra, A.
    The application of liquid metal technology in fusion devices requires R&D related to many phenomena: interaction between liquid metals and structural material as corrosion, erosion and passivation techniques; magneto-hydrodynamics; free surface fluid-dynamics and any other physical aspect that will be needed for their safe reliable operation. In particular, there is a significant shortage of experimental facilities dedicated to the development of the lithium technology. In the framework of the TECHNOFUSION project, an experimental laboratory devoted to the lithium technology development is proposed, in order to shed some light in the path to IFMIF and the design of chamber's first wall...

  4. Application of Ultraintense Lasers to validate materials for laser fusion: production of ions and other relevant species

    Alvarez Ruiz, Jesus; Mima, K.; Tanaka, K.; Perlado Martín, José Manuel
    Justification of the need and demand of experimental facilities to test and validate materials for first wall in laser fusion reactors - Characteristics of the laser fusion products - Current ?possible? facilities for tests Ultraintense Lasers as ?complete? solution facility - Generation of ion pulses - Generation of X-ray pulses - Generation of other relevant particles (electrons, neutrons..)

  5. Materials Research for HiPER Laser Fusion Facilities: Chamber Wall, Structural Material and Final Optics

    Alvarez Ruiz, Jesus; Rivera de Mena, Antonio; Gonzalez Arrabal, Raquel; Garoz Gómez, David; Rio Redondo, Emma del; Perlado Martín, José Manuel
    The European HiPER project aims to demonstrate commercial viability of inertial fusion energy within the following two decades. This goal requires an extensive Research &Development program on materials for different applications (e.g., first wall, structural components and final optics). In this paper we will discuss our activities in the framework of HiPER to develop materials studies for the different areas of interest. The chamber first wall will have to withstand explosions of at least 100 MJ at a repetition rate of 5-10 Hz. If direct drive targets are used, a dry wall chamber operated in vacuum is preferable. In this...

  6. IFMIF suitability for evaluation of fusion functional materials

    Casal, N.; Sordo Balbín, Fernando; Mota, F.; Jordanova, J.; Garcia, A.; Ibarra, A.; Vila, R.; Rapisarda, D.; Queral, V.; Perlado Martín, José Manuel
    The International FusionMaterials Irradiation Facility (IFMIF) is a future neutron source based on the D-Li stripping reaction, planned to test candidate fusionmaterials at relevant fusion irradiation conditions. During the design of IFMIF special attention was paid to the structural materials for the blanket and first wall, because they will be exposed to the most severe irradiation conditions in a fusion reactor. Also the irradiation of candidate materials for solid breeder blankets is planned in the IFMIF reference design. This paper focuses on the assessment of the suitability of IFMIF irradiation conditions for testing functionalmaterials to be used in liquid blankets and...

  7. Repercusión medioambiental del uso de la cerámica estructural en España. Energía embebida y emisiones de CO2.

    Díaz Rubio, Roberto
    Este trabajo fin de máster se desarrolla con el objetivo de conocer y evaluar la carga medioambiental de los productos de cerámica estructural, en función de la tipología de producto. Se parte de la base de la repercusión medioambiental que tiene la fabricación de los materiales de construcción, y que este impacto ambiental debe ser conocido y evaluado, no sólo para poder acometer medidas de mejora medioambiental, sino para proporcionar a prescriptores y usuarios una información que será obligatoria a corto plazo. El trabajo se centra en la cerámica estructural por ser uno de los sectores con mayor peso dentro del macrosector...

  8. Cálculo de la resistencia a la fatiga superficial en superficies con lubricación elastohidrodinámica mediante el criterio de Dang Van

    Guerra Ochoa, Eduardo de la; Chacón Tanarro, Enrique; Lafont Morgado, Pilar; Echávarri Otero, Javier; Muñoz Guijosa, Juan Manuel; Muñoz Sanz, José Luis; Diaz Lantada, Andres
    Los fenómenos de fatiga superficial en sus diferentes escalas (micropitting, pitting, spalling), aparecen en multitud de elementos mecánicos en contacto lubricado como pueden ser los engranajes o rodamientos o en elementos con contacto seco como son las ruedas de ferrocarril. Los defectos que aparecen en las superficies en contacto debidos a estos fenómenos empeoran las condiciones de funcionamiento, provocando vibraciones, desgaste prematuro y en los casos más extremos el fallo de la máquina. El procedimiento que se sugiere en este artículo se inicia con el cálculo de los parámetros que definen el contacto elastohidrodinámico y que tienen influencia en la...

  9. Tecnologías de materiales con aplicaciones en fusión y su desarrollo en la instalación TechnoFusión

    Fernandez, P.; Garcia Cortes, I.; Gonzalez, M.; Gonzalez Arrabal, Raquel; Hernandez, T.; Ibarra, A.; Jimenez Rey, D.; Monge, M.A.; Pareja, R.; Pastor Caño, Jose Ignacio; Perlado Martín, José Manuel; Roman, R.
    El futuro Centro Nacional de Tecnologías para la Fusión, TechnoFusión, tiene como objetivo desarrollar aquellas tecnologías, relacionadas con materiales, metales líquidos, manipulación remota y simulación, que permitan avanzar en los actuales retos que supone el uso de la fusión nuclear. Sus instalaciones, abiertas al servicio de la comunidad científica externa, garantizarán una destacada participación de empresas y grupos de investigación españoles. En esta contribución se describirán y analizarán las instalaciones que TechnoFusión construirá con capacidad para abordar: la fabricación y procesado de nuevas aleaciones a escala semiindustrial; el comportamiento de materiales, simulando las condiciones durante operación mediante una instalación de...

  10. Waste Management Assessment of Candidate Materials for HiPER Reaction Chamber

    Sanz Gonzalo, Javier; Juarez Mañas, Rafael; Ognissanto, Flora; Perlado Martín, José Manuel
    One of the critical decisions in the HiPER project is to select the most appropriate material for the reaction chamber. Within this framework, we investigate the performance of different steel alloys with respect to waste management. The capabilities of commercial steels, both austenitic and ferritic/martensitic, compared to reduced-activation ferritic/martensitic steels are evaluated as for different waste management strategies (near surface burial, clearance, hands-on and remote recycling). The examined materials are: SS304, SS316, mod.9Cr-1Mo and HT9 and EUROFER. Real impurities concentrations are taken into account, and their impact is analyzed. In the study, we have assumed the most exigent HiPER 4a...

  11. Materials Research for HiPER Laser Fusion Facilities: Chamber Wall, Structural Material and Final Optics.

    Alvarez Ruiz, Jesus; Rivera de Mena, Antonio; Gonzalez Arrabal, Raquel; Garoz Gómez, David; Rio Redondo, Emma del; Perlado Martín, José Manuel
    The European HiPER project aims to demonstrate commercial viability of inertial fusion energy within the following two decades. This goal requires an extensive Research &Development program on materials for different applications (e.g., first wall, structural components and final optics). In this paper we will discuss our activities in the framework of HiPER to develop materials studies for the different areas of interest. The chamber first wall will have to withstand explosions of at least 100 MJ at a repetition rate of 5-10 Hz. If direct drive targets are used, a dry wall chamber operated in vacuum is preferable. In this...

  12. Models for predicting friction coefficient and parameters with influence in elastohydrodynamic lubrication

    Lafont Morgado, Pilar; Echávarri Otero, Javier; Muñoz Sanz, José Luis; Diaz Lantada, Andres; Muñoz Guijosa, Juan Manuel; Lorenzo Yustos, Héctor; Leal Wiña, María del Pilar; Muñoz García, Julio
    This article shows different friction prediction models applicable to lubricants in point contacts under an elastohydrodynamic regime. The types of models used are two variations of the Newtonian theory, the Limiting Shear Stress model and the one based on Carreau's equation. The article sets out the theoretical calculation procedures and the ensuing equations for calculating the friction coefficient. The aims of the article are to study the effect of the parameters with influence on friction and to compare the model's results with those given by an experimental stage performed on a mini traction machine. This test system allows the measurement...

  13. A dislocation dynamics study of the strength of stacking fault tetrahedra. Part II: interactions with mixed and edge dislocations

    Martínez Sáez, Enrique; Marian, Jaime; Perlado Martín, José Manuel
    In this paper we present the sequel to Part I and present a comprehensive dislocation dynamics study of the strength of stacking fault tetrahedra to mixed and edge dislocation glides in fcc Cu.

  14. A dislocation dynamics study of the strength of stacking fault tetrahedra. Part I: interactions with screw dislocations

    Martínez Sáez, Enrique; Marian, Jaime; Arsenlis, A.; Victoria, Maximo Pedro; Perlado Martín, José Manuel
    We present a comprehensive dislocation dynamics (DD) study of the strength of stacking fault tetrahedra (SFT) to screw dislocation glide in fcc Cu. Our methodology explicitly accounts for partial dislocation reactions in fcc crystals, which allows us to provide more detailed insights into the dislocation– SFT processes than previous DD studies. The resistance due to stacking fault surfaces to dislocation cutting has been computed using atomistic simulations and added in the form of a point stress to our DD methodology. We obtain a value of 1658.9 MPa, which translates into an extra force resolved on the glide plane that dislocations...

  15. Atomistically informed dislocation dynamics in fcc crystals

    Martínez Sáez, Enrique; Marian, Jaime; Arsenlis, A.; Victoria, Maximo Pedro; Perlado Martín, José Manuel
    We develop a nodal dislocation dynamics (DD) model to simulate plastic processes in fcc crystals. The model explicitly accounts for all slip systems and Burgers vectors observed in fcc systems, including stacking faults and partial dislocations. We derive simple conservation rules that describe all partial dislocation interactions rigorously and allow us to model and quantify cross-slip processes, the structure and strength of dislocation junctions, and the formation of fcc-specific structures such as stacking fault tetrahedra. The DD framework is built upon isotropic non-singular linear elasticity and supports itself on information transmitted from the atomistic scale. In this fashion, connection between...

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