Envíos recientes

  • Effect of the temperature in the mechanical properties of austenite, ferrite and sigma phases of duplex stainless steels using hardness, microhardness and nanoindentation techniques 

    Argandoña Salinas, Gorka; Palacio, José; Berlanga Labari, Carlos Upna; Biezma, María V.; Rivero Fuente, Pedro Upna; Peña, Julio; Rodríguez Trías, Rafael Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The aim of this work is to study the hardness of the ferrite, austenite and sigma phases of a UNS S32760 superduplex stainless steel submitted to different thermal treatments, thus leading to different percentages of the ...
  • Analytical modelling of energy density and optimization of the EDM machining parameters of Inconel 600 

    Torres Salcedo, Alexia Upna; Puertas Arbizu, Ignacio Upna; Luis Pérez, Carmelo Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    In this present research work, a new modelling of energy density in EDM (Electrical Discharge Machining) is proposed. Energy density can be defined as the amount of energy needed to get a unit volume of material removed, ...
  • CO2 emissions reduction and energy efficiency improvements in paper making drying process control by sensors 

    Calvo Herrero, Luis Upna; Domingo, Rosario (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The drying process of paper has many production parameters that can influence both the energy consumed and the characteristics of paper produced. It was found that most of the previous studies conducted on this process ...
  • Design, simulation and manufacturing of a connecting rod from ultra-fine grained material and isothermal forging 

    Fuertes Bonel, Juan Pablo Upna; Luis Pérez, Carmelo Upna; Luri Irigoyen, Rodrigo Upna; Salcedo Pérez, Daniel Upna; León Iriarte, Javier Upna; Puertas Arbizu, Iñaki Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
    In this research work, a study on the mechanical properties of isothermal forging for connecting rods is made from previously ECAP (Equal Channel Angular Pressing)-processed AA1050 and AA5083 aluminium alloys. This severe ...
  • Experimental modelling of critical damage obtained in Al-Mg and Al-Mn alloys for both annealed state and previously deformed by ECAP 

    Luri Irigoyen, Rodrigo Upna; Fuertes Bonel, Juan Pablo Upna; Luis Pérez, Carmelo Upna; Salcedo Pérez, Daniel Upna; Puertas Arbizu, Iñaki Upna; León Iriarte, Javier Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
    Assessing the damage produced in plastic deformation processes permits the optimum manner to shape a material that could avoid any cracks from appearing. In this present research work, the absolute critical damage in ...
  • Comparative study of the damage attained with different specimens by FEM 

    Fuertes Bonel, Juan Pablo Upna; Luri Irigoyen, Rodrigo Upna; Luis Pérez, Carmelo Upna; Salcedo Pérez, Daniel Upna; León Iriarte, Javier Upna; Puertas Arbizu, Iñaki Upna (Elsevier, 2015)   Congreso / Biltzarra  OpenAccess
    This present research work deals with the analysis of the design of different specimen geometries so that by finite volume simulations, the appearance of cracks may be predicted in the case of forging processes. To this ...
  • Design and optimization of the dies for the isothermal forging of a cam 

    Salcedo Pérez, Daniel Upna; Luis Pérez, Carmelo Upna; Luri Irigoyen, Rodrigo Upna; León Iriarte, Javier Upna; Puertas Arbizu, Iñaki Upna; Fuertes Bonel, Juan Pablo Upna (Elsevier, 2015)   Congreso / Biltzarra  OpenAccess
    In the present study, the design of the dies required for the isothermal forging of a cam is analysed by finite volume method. Specifically, cams are of great importance in automotive industry, where a lower weight and ...
  • A proposal of a constitutive description for aluminium alloys in both cold and hot working 

    León Iriarte, Javier Upna; Luis Pérez, Carmelo Upna; Fuertes Bonel, Juan Pablo Upna; Puertas Arbizu, Iñaki Upna; Luri Irigoyen, Rodrigo Upna; Salcedo Pérez, Daniel Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
    The most important difficulties when the behaviour of a part that is subjected to external mechanical forces is simulated deal with the determination of both the material thermo-mechanical properties and its boundary ...
  • Design and mechanical properties analysis of AA5083 ultrafine grained cams 

    Salcedo Pérez, Daniel Upna; Luis Pérez, Carmelo Upna; Luri Irigoyen, Rodrigo Upna; Puertas Arbizu, Iñaki Upna; León Iriarte, Javier Upna; Fuertes Bonel, Juan Pablo Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    This present research work deals with the development of ultrafine grained cams obtained from previously ECAP (Equal Channel Angular Pressing)-processed material and manufactured by isothermal forging. The design and the ...
  • Mechanical properties analysis of an Al-Mg alloy connecting rod with submicrometric structure 

    León Iriarte, Javier Upna; Salcedo Pérez, Daniel Upna; Murillo Crespo, Óscar; Luis Pérez, Carmelo Upna; Fuertes Bonel, Juan Pablo Upna; Puertas Arbizu, Iñaki Upna; Luri Irigoyen, Rodrigo Upna (MDPI, 2015)   Artículo / Artikulua  OpenAccess
    Over these last few years, there has been a growing interest in developing mechanical components from submicrometric materials due to the significant improvement that these materials present compared to their original ...
  • Design, optimization, and mechanical property analysis of a submicrometric aluminium alloy connecting rod 

    Fuertes Bonel, Juan Pablo Upna; León Iriarte, Javier Upna; Luis Pérez, Carmelo Upna; Salcedo Pérez, Daniel Upna; Puertas Arbizu, Iñaki Upna; Luri Irigoyen, Rodrigo Upna (Hindawi, 2015)   Artículo / Artikulua  OpenAccess
    Ultrafine grained materials have a great deal of both scientific and technological interest because they allow outstanding properties to be obtained. An improvement in the mechanical strength and in the ductility and a ...
  • Analysis of fatigue and wear behaviour in ultrafine grained connecting rods 

    Luri Irigoyen, Rodrigo Upna; Luis Pérez, Carmelo Upna; León Iriarte, Javier Upna; Fuertes Bonel, Juan Pablo Upna; Salcedo Pérez, Daniel Upna; Puertas Arbizu, Iñaki Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Over the last few years there has been an increasing interest in the study and development of processes that make it possible to obtain ultra-fine grained materials. Although there exists a large number of published works ...
  • Net thermoelectric power generation improvement through heat transfer optimization 

    Aranguren Garacochea, Patricia Upna; Astrain Ulibarrena, David Upna; Rodríguez García, Antonio Upna; Martínez Echeverri, Álvaro Upna (Elsevier, 2017)   Artículo / Artikulua
    Thermoelectric generation contributes to obtain a more sustainable energetic system giving its potential to harvest waste heat and convert it into electric power. In the present study a computational optimal net generation ...
  • Thermoelectric generators for waste heat harvesting: a computational and experimental approach 

    Aranguren Garacochea, Patricia Upna; Araiz Vega, Miguel Upna; Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna (Elsevier, 2017)   Artículo / Artikulua
    Waste heat generation has a widespread presence into daily applications, however, due to the low-temperature grade which presents, its exploitation with the most common technologies is complicated. Thermoelectricity ...
  • Experimental and computational study on thermoelectric generators using thermosyphons with phase change as heat exchangers 

    Araiz Vega, Miguel Upna; Martínez Echeverri, Álvaro Upna; Astrain Ulibarrena, David Upna; Aranguren Garacochea, Patricia Upna (Elsevier, 2017)   Artículo / Artikulua
    An important issue in thermoelectric generators is the thermal design of the heat exchangers since it can improve their performance by increasing the heat absorbed or dissipated by the thermoelectric modules. Due to its ...
  • Situación actual y prospectiva de futuro del sector de las energías renovables en Navarra 

    Pintor Borobia, Jesús María Upna; García Ortega, Justo Upna; Faulín Fajardo, Javier Upna; Lera López, Fernando Upna (Gobierno de Navarra, Departamento de Economía y Hacienda, 2003)   Congreso / Biltzarra  OpenAccess
    Razones económicas y medioambientales han hecho que la búsqueda de nuevas formas de energía se haya intensificado en los últimos años, desarrollándose distintos tipos de energías renovables. En el caso de la Unión Europea, ...
  • Design of low-cost smart accelerometers 

    Carlosena García, Alfonso Upna; López Martín, Antonio Upna; Massarotto, Marco Upna; Cruz Blas, Carlos Aristóteles de la Upna; Lecumberri Villamediana, Pablo Upna; Gómez Fernández, Marisol Upna; Pintor Borobia, Jesús María Upna; Gárriz Sanz, Sergio Upna (Universitat Politècnica de Catalunya, 2005)   Artículo / Artikulua  OpenAccess
    The goal of this project is to design a low-cost smart accelerometer, making use of a piezoelectric element as basic sensing material, and adding a mixed-mode conditioning circuit.
  • Zero-power-consumption thermoelectric system to prevent overheating in solar collectors 

    Martínez Echeverri, Álvaro Upna; Astrain Ulibarrena, David Upna; Rodríguez García, Antonio Upna (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
    Highly promoted by the European Union Climate and Energy Package for 2020, solar collectors stand out as the most promising alternative to meet water heating demands. One of the most limiting problems in these systems ...
  • Improvement of a thermoelectric and vapour compression hybrid refrigerator 

    Astrain Ulibarrena, David Upna; Martínez Echeverri, Álvaro Upna; Rodríguez García, Antonio Upna (Elsevier, 2012)   Artículo / Artikulua  OpenAccess
    This paper presents the improvement in the performance of a domestic hybrid refrigerator that combines vapour compression technology for the cooler and freezer compartments, and thermoelectric technology for a new compartment. ...
  • Thermoelectric self-cooling for power electronics: increasing the cooling power 

    Martínez Echeverri, Álvaro Upna; Astrain Ulibarrena, David Upna; Aranguren Garacochea, Patricia Upna (Elsevier, 2016)   Artículo / Artikulua
    Thermoelectric self-cooling was firstly conceived to increase, without electricity consumption, the cooling power of passive cooling systems. This paper studies the combination of heat pipe exchangers and thermoelectric ...

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