Recursos de colección

Archivo Digital UPM (122.777 recursos)

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

Materia = Materiales

Mostrando recursos 1 - 20 de 189

  1. Construcción con tierra. Reinterpretación de una tradición

    Catalán Diez, Raquel
    La tierra es un material que se ha utilizado en construcción desde muy antiguo y, aunque se ha ido olvidando debido a la industrialización de la construcción, en la actualidad está resurgiendo el interés por ella. Cada vez hay más propuestas de emprendedores que reinterpretan las técnicas tradicionales existentes, consiguiendo soluciones muy innovadoras que tienen como fundamento la búsqueda de una nueva arquitectura sostenible y saludable. Este desarrollo tecnológico facilitará el desarrollo tanto de arquitectura de vivienda como de índole pública. Tras estas soluciones constructivas existe un gran estudio previo sobre el propio material, cuyas propiedades térmicas e higrotérmicas permiten su utilización en elementos de envolvente, como método...

  2. Characterization of the porous structure of cement mortars additivated with architectural residues insulated from mineral wood

    Piña Ramírez, Carolina; Atanes Sánchez, Evangelina; Kosior-Kazberuk, Marta; Malaskiewicz, Dorota
    The Mineral wool is currently the European Union's most used building insulation, which has led to the fact that the volume of this waste from insulating materials stored in landfills (Figure 1) has increased alarmingly in the last decade [1], making it essential to recycle or reuse it, in oder to reduce the environmental impact of the product [2]. In this research work the study of the characterization of the porous structure of cement mortars with different types of mineral fiber waste from construction and demolition for recycling is addressed. The microstructure and porosity of the material has been described,...

  3. ESTRESTURAS: APPS (Anexo de Prácticas y Problemas Solucionados)

    De Miguel Rodriguez, José Luis; Orta Rial, María Belén; García Alonso, María Dolores; Calle García, Alejandro
    Este texto está elaborado pensando en la asignatura Estructuras 3 de los estudios que conducen al título de Grado en Fundamentos de Arquitectura que se imparte en la Escuela Técnica Superior de Arquitectura de Madrid (ETSAM) de la Universidad Politécnica de Madrid (UPM). En él se desarrollan todos los temas de la asignatura con el método de plantear un problema y resolverlo exponiendo el proceso. Son problemas de dificultad creciente, al principio de cada capítulo los problemas se resuelven paso a paso y al final se plantean ejercicios sin solución con el fin de que el alumno tenga la oportunidad...

  4. Study of the Effect of Laser Marking for Standard Weights

    Lumbreras, Ángel; Ocaña Moreno, José Luis; Fuentes, Héctor; Gamarra, Javier; Piedra, Dolores de la; Medina, Nieves
    Most class E weights are made of austenitic stainless steel and they do not have any marking to be distinguished. In this study two special types of laser marking have been used to provide a proper marking so that the marking effect is negligible for the mass value and the corresponding drift. The drift has been studied by mea ns of several calibrations during more than 10 years.

  5. A Fluid-Dynamic Numerical Model for the Selective Laser Melting of High-Thickness Metallic Layers

    Cordovilla Baró, Francisco; Garzón, Miguel; Muñoz, Diego Alejandro; Díaz, Javier; García Beltrán, Ángel; Ocaña Moreno, José Luis
    Productivity in the Selective Laser Melting Process (SLM) is directly related with the thickness of the powder bed that is repeatedly applied, at every increment, in the growing of consolidated material in the additive manufacturing process. Although most of the relevant phenomena (limited diffusivity associated to particles contact, phase changes, gradients of surface tension associated with Marangoni convection, or even recoil pressure) are considered in the models with small bed thicknesses (roughly 20 µm ? 40 µm), in the case of larger thicknesses (between 100 µm and 200 µm) these factors strongly influence the size and shape of the fusion...

  6. Laser Shock Processing for the Enhancement of Mechanical and Surface Properties of Biocompatible Alloys

    Ocaña Moreno, José Luis; González-Carrasco, J. L.; Lieblich, M.; Porro González, Juan Antonio; Díaz Muñoz, Marcos; Angulo Ramonell, Ignacio; Cordovilla Baró, Francisco; Peral Jiménez, David
    Laser Shock Processing (LSP) is developed as a technique allowing the effective induction of residual stresses fields in metallic materials allowing a high degree of surface material protection against fatigue crack propagation, abrasive wear, chemical corrosion and other failure conditions, what makes the technique specially suitable and competitive with presently use techniques for the treatment of heavy duty components in the aeronautical, nuclear and automotive industries. The highly beneficial effect of LSP treatments has been demonstrated in the extension of life of test specimens with induced surface notches. The application of the LSP treatment to concrete high reliability components, particularly...

  7. Systematic Development Strategy for Smart Devices Based on Shape-Memory Polymers

    Díaz Lantada, Andrés
    Shape-memory polymers are outstanding ?smart? materials, which can perform important geometrical changes, when activated by several types of external stimuli, and which can be applied to several emerging engineering fields, from aerospace applications, to the development of biomedical devices. The fact that several shape-memory polymers can be structured in an additive way is an especially noteworthy advantage, as the development of advanced actuators with complex geometries for improved performance can be achieved, if adequate design and manufacturing considerations are taken into consideration. Present study presents a review of challenges and good practices, leading to a straightforward methodology (or integration of...

  8. How the surrounding environment affects the biosensing performance of resonant nanopillars arrays: Under dry conditions or immersed in fluid

    López Hernández, Ana; Casquel Del Campo, Rafael; Holgado Bolaños, Miguel; Cornago, Iñaki; Fernández, Fátima; Ciaurriz, Paula; Sanza Gutiérrez, Francisco Javier; Santamaría Fernández, Beatriz; Maigler, M. Victoria; Quintero Moreno, Sergio Andrés; Laguna Heras, Maria Fe
    In this work we demonstrate the advantage of performing the biosensing process of a refractive indexoptical biosensor under dry conditions, in comparison with the biosensing structure immersed in fluid.We developed a biosensing experiment over a specific transducer based on resonant nanopillars (R-NPs)arrays. The optical interrogation to monitor the recognition events was firstly performed with the R-NPsin dry, only in contact with the air, and secondly with the R-NPs immersed in water. We observed asignificant enhance in the sensitivity of the biosensing curve response for the R-NPs in dry conditions,leading an improvement of the Limit of Detection (LoD) in more than...

  9. Laser Shock Processing of Metallic Alloys: Process Overview and Development of Advanced Applications through the Integrated Modelling-Processing-Testing Approach for the Robust Design of Treatments on High-Reliability Components

    Ocaña Moreno, José Luis; Porro González, Juan Antonio; Díaz Muñoz, Marcos; García Beltrán, Ángel; Angulo Ramonell, Ignacio; Cordovilla Baró, Francisco
    The physically based UPM Integrated Modelling-Processing-Testing approach for the design of LSP treatments will be presented along with different examples of its application to realistic treatment design problems and with recent developments on laser-plasma interaction and diagnosis, shocked materials behavior description and process application to novel high reliability components of emerging interest.

  10. Generation of Modified Wettability Metallic Surfaces by Short Pulse Lasers

    Ocaña Moreno, José Luis; Jagdheesh, Radhakrishnan; García-Ballesteros Ramírez, Juan José; Cordovilla Baró, Francisco
    The current availability of lasers with characteristic pulse lengths ranging from ns to fs has provided a unique frame in which the development of laser generated microstructures has been made possible for very diverse kinds of materials and applications. At the same time, the development of the appropriate laser processing workstations granting the appropriate precision and repeatibility of the respective laser interaction processesin line with the characteristic dimension features required in the microstructured samples has definitively consolidated laser surface microstructuring as a reference domain nowadays unavoidable for the design and manufacturing of current use microsystem: MEMSs, fluidic devices, advanced sensors,...

  11. Analysis Of The Effect Of Surface Oxidation On The Laser Transformation Hardening Of Cr-mo Steels

    Cordovilla Baró, Francisco; García Beltrán, Ángel; Domíngez, Jesús; Sancho, Paula; Ocaña Moreno, José Luis
    Laser surface hardening is a technology that enables important advantages to be obtained in comparison with conventional techniques in terms of accuracy of the heat affected zone and productivity. Nevertheless, the development of realistic and flexible models has to be fulfilled in order to control the effects of every set of process conditions. Despite many different models having been developed, very few of them deal with the increment of absorption related with the instantaneous value of the layer of oxide growth during the process in a non-protective atmosphere. This work analyzes, on one hand, the problem of oxide formation at...

  12. Improvement of Fatigue Life and Surface Properties of Metallic Materials of Biomedical Interest by Laser Shock Processing

    Ocaña Moreno, José Luis; Porro González, Juan Antonio; Díaz Muñoz, Marcos; Angulo Ramonell, Ignacio; Cordovilla Baro, Francisco; Peral Jiménez, David; González-Carrasco, J. L.; Lieblich, M.
    Laser Shock Processing (LSP) is developed as a technique allowing the effective induction of residual stresses fields in metallic materials allowing a high degree of surface material protection against fatigue crack propagation, abrasive wear, chemical corrosion and other failure conditions, what makes the technique specially suitable and competitive with presently use techniques for the treatment of heavy duty components in the aeronautical, nuclear and automotive industries. The highly beneficial effect of LSP treatments has been demonstrated in the extension of life of test specimens with induced surface notches. The application of the LSP treatment to concrete high reliability components, particularly...

  13. A thermal resistances-based approach for thermal-elastrohydrodynamic calculations in point contacts

    Guerra Ochoa, Eduardo de la; Echávarri Otero, Javier; Chacón Tanarro, Enrique; Río López, Benito del
    This article presents a thermal resistances-based approach for solving the thermal-elastohydrodynamic lubrication problem in point contact, taking the lubricant rheology into account. The friction coefficient in the contact is estimated, along with the distribution of both film thickness and temperature. A commercial tribometer is used in order to measure the friction coefficient at a ball-on-disc point contact lubricated with a polyalphaolefin base. These data and other experimental results available in the bibliography are compared to those obtained by using the proposed methodology, and thermal effects are analysed. The new approach shows good accuracy for predicting the friction coefficient and requires...

  14. Sulfate resistance in OPC and SRPC containing calcined paper sludge waste: ettringite or thaumasite formation

    Talero Morales, Rafael; Arámburo, Carlos; González Cortina, Mariano; Sánchez de Rojas, M.I.; Blázquez, Antonio; Frías, Moisés; Pedrajas, César
    The Le Chatelier-Anstett test was used to study the sulfate resistance of cement pastes containing calcined paper sludge waste (MC). MC was blended with two types of portland cement (PC): P1 with and P2 without C3AC3A (ordinary portland cement, OPC, and sulfate-resistant portland cement, SRPC, respectively). The study of thaumasite formation required the utilization of a third PC, P3. The results showed that sulfate resistance always decreased at higher ratios of PC replacement by MC. This behavior was attributable to the expansive synergic effect (ESE), originated by the coprecipitation of ettringite from two resources in a gypsum and water medium....

  15. Study, design and prototyping of arm splint with additive manufacturing process

    Blaya Haro, Fernando; San Pedro, Pilar; López Silva, Julia; D'Amato, Roberto; Juanes Méndez, Juan Antonio; Gómez Lagándara, Juan
    The aim of this study is to propose the additive manufactured 3D printed technique for adaptive organic design splint as a solution for the problems generated by the use of casts in medical applications. Since the end of the XVIII century, when casts begin to be used, they have barely improved. Thanks to new manufacture and material techniques, we can improve and modernize this commonly used fracture treatment method. Based on three dimensional digitalization techniques and modeling via reverse engineering software, a 3D printed splint is proposed, which will provide the benefits of cast avoiding its deficiencies.

  16. Evaluación de la resistencia a cortante de hormigón reforzado con fibras de acero

    García Alberti, Marcos; Enfedaque Díaz, Alejandro; Gálvez Ruiz, Jaime; Picazo Iranzo, Álvaro
    Ponencia presentada al VII Congreso Internacional de Estructuras donde se evalúa la resistencia a cortante de hormigón reforzado con fibras de acero mediante ensayos "push-off"

  17. Fracture Mechanics Adjustment of the Fatigue Detail Category for Constructional Details of Eurocode 3 Containing Imperfect Transverse Butt Welds

    Valiente Cancho, Andrés; Iordachescu, Mihaela
    The fatigue detail category attributed by Eurocode 3 to joints between transverse butt welded tensile plates is interpolated on a Fracture Mechanics basis for intermediate cases where backing strips are used, but incomplete attaching along the weld seam increases the risk of root cracking. No hypotheses other than those of Eurocode 3 for fracture prevention are assumed, but the statistical number of initial cracks. Through this assumption the influence of the plate width is incorporated into the detail category. The results agree with those of a straightforward linear interpolation.

  18. Hydrogen Induced Damage in Heavily Cold-Drawn Wires of Duplex Stainless Steel

    Iordachescu, Mihaela; Abreu Rodrigues, Maricely de; Valiente Cancho, Andrés
    The paper addresses the sensitivity to hydrogen embrittlement of heavily cold-drawn wires made of the new generation of lower alloyed duplex stainless steels, often referred to as lean duplex grades. It includes comparisons with similar data corresponding to cold-drawn eutectoid and duplex stainless steels. For this purpose, fracture tests under constant load were carried out with wires in the as-received condition and fatigue-precracked, in air and exposed to ammonium thiocyanate solution.

  19. A Simple Energy-conserving Torsion-free Beam Element for Multibody Applications

    García Orden, Juan Carlos
    Slender flexible beams are very common in many applications in different fields related to multibody dynamics: robotics, aerospace mechanisms, computer graphics, etc. Typically, these components experience small strains but large displacements and rotations. What is more, ofter their torsional strains are very small or null, due to their slenderness or the specific type of kinematical pairs that connect them with other parts of the mechanism. The numerical simulation of the dynamical behavior of such systems demand the development of beam elements capable of representing these nonlinear effects, while providing accurate results when used with a time-marching scheme. Many different approaches...

  20. Metodología de los trabajos de campo para la prospección de zeolitas naturales

    Costafreda Mustelier, Jorge Luis
    Los yacimientos de zeolitas naturales, como cualquier otro, están sujetos a normas de investigación que varían en dependencia de las necesidades del momento. En los últimos seis años, por citar un ejemplo, el estudio y la explotación de los recursos no metálicos en España, incluyendo las zeolitas naturales, ha experimentado un fuerte declive que ubica la demanda muy por debajo de las cifras conocidas antes del 2008, fecha en que se destapó la verdadera cara de la llamada “burbuja inmobiliaria”, cuya ruptura arrastró consigo, en una espectacular y desastrosa caída, un mercado que representaba el trabajo y las aspiraciones de...

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