DMMCTE - DFEE - Comunicaciones en Congresos y otros eventos
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Publication Seismic analysis of the zaouiat ait mellal twin tunnels of Agadir motorway (Morocco)(EDP Sciences, 2020) El Omari, Abdelhay; Chourak, Mimoun; Navarro Ugena, Carlos; Cherif, Seif Eddine; Rougui, Mohamed; Bakali, Hassan; Sánchez Merino, Ángel LuisUnderground structures, such as tunnels, are vital for ensuring all kinds of transportation; and being buried under the surface makes them exposed to soil dynamics. Added to the moderate seismic activity in Morocco, the stability of tunnels is put to the test. This paper examines the interaction between the ZAM (Zaouit Ait Mellal ) twin tunnels between the cities of Marrakesh and Agadir, using the Difference Element Method provided by FLAC 2D software. The acceleration is introduced as the one related to the historic event of El centro 1940 with free-field boundary conditions in the numerical model, with three configurations: tunnel 1 without tunnel 2, tunnel 2 without tunnel 1 and tunnel 1 with tunnel 2. The results of the simulations indicate that the differences values of the maximum displacement, axial force and bending moment on structural elements are very noteworthy from the configuration of the tunnel (single) to the twin tunnels in order to prove the interaction between these latter under seismic loading.Publication Modeling high-speed impact on CFRP's with an energy balance equation(DYMAT, 2010) López Puente, Jorge; Varas Doval, David; Loya Lorenzo, José Antonio; Navarro Ugena, Carlos; Zaera, RamónIn this work an analytical model has been developed in order to predict the residual velocity of a spherical or cylindrical steel projectile, after impacting into a woven carbon/epoxy thin laminate. The model is based in an energy balance, in which the kinetic projectile energy is absorbed by the laminate through three different mechanisms: linear momentum transfer, fiber failure and laminate crushing. This last mechanism needs the quantification of the through-thickness compressive strength, which has been evaluated by means of quasi-static punch tests. Finally, high velocity impact tests have been accomplished in a wide range of velocities, to validate the model.Publication Tecnologías para la seguridad y su aplicación en la formación superior de los futuros oficiales de la Guardia Civil(2015) Rodríguez Millán, Marcos; Marco Esteban, Miguel; Loya Lorenzo, José Antonio; Moure Colón, Fernando; Miguélez Garrido, María Henar; Ministerio de Economía y Competitividad (España)El trabajo presenta la metodología empleada por el Centro Universitario de la Guardia Civil (CUGC) y la Universidad Carlos III de Madrid (UC3M) para el desarrollo de Trabajos Fin de Grado (TFG) enfocados a la aplicación educacional en defensa y seguridad. Los resultados presentados son desarrollados por los alumnos de cuarto curso en el Grado en Ingeniería de la Seguridad. El conocimiento desarrollado en el aspecto de la seguridad y el uso de nuevas herramientas numéricas son de gran utilidad para los futuros oficiales de la Guardia Civil. La principal contribución de este artículo es mostrar la heterogeneidad de los trabajos realizados, destacando el uso de herramientas informáticas para prevención, diseño y mejora de los dispositivos de seguridad y protección de las libertades de las personas. El uso de este tipo de herramientas aún no ha sido suficientemente utilizado a pesar de las amplias posibilidades que ofrece en el campo de la seguridad. En este documento se destacan los principales TFG destinados a la seguridad física así como al análisis de la seguridad empleando dispositivos tecnológicos: móviles, aviones no tripulados, material técnico y especializado para incendios estructurales.Publication Análisis numérico del efecto de la protección de mandíbula y visor del casco de combate bajo cargas explosivas(2015) Rodríguez Millán, Marcos; López-Gálvez Muñoz, Héctor; Loya Lorenzo, José Antonio; Lee, Heow Pueh; Miguélez Garrido, María Henar; Ministerio de Economía y Competitividad (España)En este trabajo se ha analizado numéricamente, mediante el uso del código comercial de elementos finitos ABAQUS/Explicit, el comportamiento de distintos componentes de una protección personal de cabeza humana (casco de combate) ante una amenaza explosiva. Los resultados obtenidos muestran la propagación de la onda de choque, responsable del incremento de la presión intracraneal. El desarrollo óptimo de la protección personal de la cabeza permite paliar el efecto de la onda presión sin exceder los límites establecidos.Publication Análisis numérico de blindajes cerámicos modulares inspirados en la naturaleza para protecciones balísticas(Grupo Español de Fractura, 2018) González Albuixech, Vicente Francisco; Rodríguez Millán, Marcos; Ito, T.; Loya Lorenzo, José Antonio; Miguélez Garrido, María HenarThe requirements increase of the protections used by the security forces, which should combine a high capacity for protection and ergonomics, have determined an interest on bioinspired protections. This work presents a numericalstudy numerical of its role performance against impact. We have considered ceramic armours based on ganoid fishscales (gars, bichirs and reedfishes), placoid fish scales (sharks and rays) and armadillos. Perpendicular impacts tosurface protection, oblique and double impacts are considered. It is concluded that the localized damaging and crack arrest properties, associated with its modular configuration, improve their efficiency on multihit situations, besides itspotential ergonomic, convert them in suitable candidates for a deeper study.Publication Photo-termo-elastic behaviour of a PMMA-core POF(Copy Red, S.A., 2013) Pérez Castellanos, José Luis; Sánchez Montero, David Ricardo; Vázquez García, María Carmen; Zahr Viñuela, Jorge AlonsoThe use of fiber optic sensing systems of mechanical elements are based, among others, on light variations versus strain. This paper shows the results of tensile tests on a PMMA-core POF with simultaneous measurement of both optical intensity and temperature changes.Publication Study of the photo-thermo-mechanical behaviour of PMMA-core POFs(Plastic Optical Fiber Trade Organization, 2013-09) Sánchez Montero, David Ricardo; Torres Zafra, Juan Carlos; Pérez Castellanos, José Luis; Zahr Viñuela, Jorge Alonso; Vázquez García, María CarmenIn this work, we report the results obtained during the photo-thermo-mechanical characterization of a PMMA-core plastic optical fiber (POF) through tensile tests. Simultaneous measurements of the received optical power and temperature variation during the deformation process are also reported, analyzing its viability as an intensity-based sensing system.Publication Numerical analysis of the brittle-ductile transition in the failure-mode in polymeric materials(Trans Tech Publications Ltd., 2013) Aranda Ruiz, Josué; Loya Lorenzo, José AntonioIn this paper we analyze, using the Finite Element Method, the process of brittle-ductile transition in the failure mode observed in polycarbonate notched specimens under impact loads. In order to analyze this transition we have implemented, through a user subroutine, a damage model which combines a tensional fracture criterion and an energetic, acting simultaneously. The competition between both criteria predicts the difference in material behavior from a critical impact velocity, and how this transition is produced on different planes through the thickness of the specimen. These results show the necessity of employing three-dimensional models for its study.Publication Modelling of composite sandwich structures with honeycomb core subjected to high-velocity impact(Elsevier, 2010-08) Buitrago Pérez, Brenda; Santiuste Romero, Carlos; Sánchez Sáez, Sonia; Barbero Pozuelo, Enrique; Navarro Ugena, CarlosIn this study the perforation of composite sandwich structures subjected to high-velocity impact was analysed. Sandwich panels with carbon/epoxy skins and an aluminium honeycomb core were modelled by a three-dimensional finite element model implemented in ABAQUS/Explicit. The model was validated with experimental tests by comparing numerical and experimental residual velocity, ballistic limit, and contact time. By this model the influence of the components on the behaviour of the sandwich panel under impact load was evaluated; also, the contribution of the failure mechanisms to the energy-absorption of the projectile kinetic energy was determined.Publication Estudio experimental y numérico del comportamiento de láminas de acero sometidas a impacto de media y alta velocidad(Grupo Español de Fractura (GEF), 2008) Rodríguez-Martínez, José A.; Rusinek, Alexis; Zaera, Ramón; Arias Hernández, Ángel; Klepaczko, Janusz Roman[EN] In the present work it is experimentally and numerically analyzed the mechanical response of steel sheets subjected to medium and high impact velocity (40 m/s – 300 m/s). The experimental device developed, based on the Hopkinson bar technique, has allowed to evaluate the influence of friction in the fracture mechanics of the steel sheets. The material behaviour has been modelled using the Rusinek-Klepaczko constitutive relation which has been implemented into the FE code ABAQUS/Explicit via user subroutine. The validation of the results obtained from the numerical simulations has been made in terms of failure time, force-time history, ballistic limit and failure mode. The numerical simulations consider the influence of the projectile shape in the failure mode and particularly the petalling process apparition. The use of 3D simulation technique has permitted to reproduce accurately the asymmetry of this kind of processes.Publication Mecanismos de fallo en placas de acero sometidas a impacto de proyectiles cilíndricos, cónicos y hemisféricos(Grupo Español de Fractura (GEF), 2008) Rodríguez-Martínez, José A.; Rusinek, Alexis; Arias Hernández, Ángel; Klepaczko, Janusz Roman; Fernández Sáez, José[EN] In this work a numerical study is presented of the behaviour of Weldox 460 E steel plates of 12 mm thickness subjected to perpendicular impact of rigid projectiles of different nose shapes: cylindrical, hemispherical and conical. The numerical simulations have been carried out using the FE commercial code ABAQUS/Explicit. The validation of the numerical results using experimental results available in the international literature has been done considering failure time, ballistic limit and the energy absorbed by the plate. In order to evaluate the influence of the thermoviscoplastic material behaviour on the results obtained, two different constitutive relations have been compared: Johnson-Cook and Rusinek-Klepaczko.