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Ara es mostren els items 45-64 de 93

    • Heat transport with advection in fractured rock 

      Pérez Carreras, Adrià; Carol, Ignacio; Prat Catalán, Pere (CIMNE, 2019)
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      In the transport of heat in porous media, diffusion generally dominates over advection due to slow fluid velocities imposed by low permeability. This is the reason why standard Galerkin formulation leading to extra ...

    • Heat transport with advection in fractured rock 

      Pérez Carreras, Adrià; Carol, Ignacio; Prat Catalán, Pere (2019)
      Text en actes de congrés
      Accés obert
      In the transport of heat in porous media, diffusion generally dominates over advection due to slow fluid velocities imposed by low permeability. This is the reason why standard Galerkin formulation leading to extra ...

    • High temperature effects in mortar and concrete specimens using a meso-mechanical model with fracture based zero-thickness interface elements 

      Rodriguez, M.; López Garello, Carlos María; Carol, Ignacio; Murcia, J. (CIMNE, 2011)
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      This paper describes recent numerical simulation results of a purely mechanical study of the effects of high temperature in mortar and concrete. The material has been considered as a two-phase composite, with different ...

    • Hydraulic fracture modelling with double node zero-thickness interface elements. 

      Garolera Vinent, Daniel; Segura, J.M.; Carol, Ignacio; Lakshmikantha, M.R.; Alvarellos, J. (Universitat Politècnica de Catalunya. Departament d'Enginyeria del Terreny, Cartogràfica i Geofísica, 2015-06-02)
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    • Hydro-mechanical coupling in zero-thickness interface elements, formulation and applications in geomechanics 

      Garolera Vinent, Daniel; Aliguer Piferrer, Ignasi; Carol, Ignacio; Segura, J.M.; Lakshmikantha, Ramasesha Mookanahallipatna; Alvarellos Iglesias, José (CRC Press, 2014)
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      Zero-thickness joint/interface elements of the Goodman type, have been advantageously used to solve many problems in solid mechanics involving material interfaces or discontinuities. Some years ago, the authors have also ...

    • Iterative strategies based on constitutive dissipation 

      Crusat Codina, Laura; Carol, Ignacio (International Centre for Numerical Methods in Engineering (CIMNE), 2021)
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      FE formulation of solid mechanics problems typically require iterative strategies to solve the resulting nonlinear system. Basic strategies with prescribed load values, such as the Newton-Raphson method, are not valid in ...

    • Mecanismos tridimensionales de rotura en estribos de presas bóveda. Estudio de la seguridad 

      Alonso Pérez de Agreda, Eduardo; Carol, Ignacio; Gens Solé, Antonio; Balcells Prat, Pere; Herrero Pérez, Eugenio (Comité Nacional Español de Grandes Presas (SPANCOLD), 1993)
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      En el articulo se describe un procedimiento para la determinación de coeficientes de seguridad frente al deslizamiento de cuñas de roca pertenecientes a los estribos de presas bóveda. La metodología requiere un cálculo ...

    • Meso-mechanical analysis of the fracture of concrete specimens in mixed mode 

      Rodríguez, Mariana; López Garello, Carlos María; Carol, Ignacio; Caner, Ferhun Cem (2009)
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      This paper describes recent numerical simulation results of some experiments carried out by Nooru-Mohamed to study mixed mode fracture of concrete. The numerical simulation is based on a meso-mechanical model developed ...

    • Mesomechanical analysis of concrete under loading that generates rotation of cracking 

      Puiggrós, L.; López Garello, Carlos María; Rodríguez, Mariana; Carol, Ignacio (CIMNE, 2015)
      Comunicació de congrés
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      Willam´s test has been often used to compare constitutive models which take into account induced anisotropy due to damage and cracking. This numerical test emulates the continuous rotation of the principal stress and ...

    • Methods for FEM stress initialization based on stress functions, and application to a reservoir cross-section 

      Aliguer Piferrer, Ignasi; Rafels Ybern, Carles; Jaqués Adell, Irene; Carol, Ignacio; Prat Catalán, Pere; Lakashmikhanta, Ramasesha; Segura Segarra, José María (OnePetro, 2013)
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      An accurate description of the in-situ stress field in a rock mass is crucial in different areas of geo-engineering such as: underground excavations, hydrocarbon extraction, CO2 storage, hydraulic fracture etc. In this ...

    • Micromechanical analysis of damage and fracture in sandstone rock specimens, using zero-thickness interface elements 

      Garolera Vinent, Daniel; Carol, Ignacio; López Garello, Carlos María (CIMNE, 2011)
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      This numerical study deals with the analysis of rock specimens from a micromechanical point of view. The analysis is based on the Finite Element Method (FEM) with fracture-based zero-thickness interface elements, and ...

    • Micromechanical analysis of sand production 

      Garolera Vinent, Daniel; Carol, Ignacio; Papanastasiou, Panos (2019-04)
      Article
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      We present a micromechanical approach based on zero-thickness interface elements for modelling advanced localization and cracking states of cemented granular materials, such as reservoir sandstones. The proposed methodology ...

    • Model for alkali-silica reaction expansions in concrete using zero-thickness chemo-mechanical interface elements 

      Liaudat, Joaquín; Carol, Ignacio; López Garello, Carlos María (2020-12)
      Article
      Accés obert
      Alkali-Silica Reaction (ASR) is a particular type of chemical reaction in concrete, which produces cracking and overall expansion of the affected structural element due to the formation of expansive reaction products within ...

    • Modeling concrete expansions via couped C-M mesoscale analysis with zero-thickness interface elements, and lab experiments 

      Carol, Ignacio; Liaudat, Joaquín; López Garello, Carlos María (ISTE-Wiley, 2017)
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      Accés restringit per política de l'editorial
      This paper briefly summarizes ongoing developments on C-M coupled modelling of concrete swelling due to external sulfate attack and due to alkali-silica reaction. Both models are based on a meso-mechanical model for concrete, ...

    • Modeling of drying shrinkage of concrete specimens at the meso-level 

      Idiart Castellano, Andrés Enrique; López Garello, Carlos María; Carol, Ignacio (2010)
      Article
      Accés restringit per política de l'editorial
      In this paper, an existing mesomechanical model for cementitious materials is extended to the domain of diffusion-driven phenomena. The model is based on the Finite Element Method, and uses zerothickness interface elements ...

    • Modeling of heat and mass transfer induced by high temperature in concrete 

      Rodríguez, Mariana; López Garello, Carlos María; Carol, Ignacio (CIMNE, 2015)
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      In the context of a long term development of a general meso-mechanical model for concrete under mechanical and environmental actions, this paper describes the on-going work to represent theheat and moisture transfer in ...

    • Modelling acid attack of oil-well cement exposed to carbonated brine: effect of specimen geometry on experimental results 

      Barandiarán Villegas, Lucía Belén; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (CIMNE, 2019)
      Text en actes de congrés
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      In recent years, the authors and co-workers have developed a diffusion-reaction model for the degradation process of oil-well cements exposed to carbonated brines in the context of CO2 capture and storage in abandoned oil ...

    • Modelling acid attack of oilwell cement exposed to carbonated brine 

      Liaudat, Joaquín; Martínez Estévez, Ariadna; López Garello, Carlos María; Carol, Ignacio (John Gale, 2018-01)
      Article
      Accés obert
      A diffusion-reaction model for the carbonation process of oilwell cement exposed to carbonated brine under CO2 geological storage conditions is presented. The formulation consists of two main diffusion/reaction field ...

    • Modelling acid attack of oilwell cement exposed to carbonated brine: effect of specimen geometry on experimental results 

      Barandiarán Villegas, Lucía Belén; Liaudat, Joaquín; López Garello, Carlos María; Carol, Ignacio (2019)
      Text en actes de congrés
      Accés obert
      In recent years, the authors and co-workers have developed a diffusion-reaction model for the degradation process of oilwell cements exposed to carbonated brines in the context of CO2 capture and storage in abandoned oil ...

    • Modelling of heat and moisture transfer in concrete at high temperature 

      Rodríguez, Mariana; López Garello, Carlos María; Carol, Ignacio (2017)
      Text en actes de congrés
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      Moisture diffusion and related fluid pressures play a key role in cracking and spalling of concrete subject to high temperatures. This paper describes recent developments of a mode for moisture and heat transfer in porous ...