Now showing items 1-20 of 25

    • Analysis of pre-tensioned structures by means of a constitutive Serial-Parallel rule of mixtures 

      Barbu, Lucia Gratiela; Escudero Torres, Cuauhtemoc; Cornejo Velázquez, Alejandro; Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbat Barbat, Horia Alejandro (2017)
      Conference report
      Open Access
      The main purpose of this paper is to develop a reliable method based on a three-dimensional (3D) finite-element (FE) model to simulate the constitutive behaviour of reinforced concrete structures strengthened with ...
    • Analysis of the mock-up of a reactor containment building: comparison with experimental results 

      Jiménez Reyes, Sergio; Cornejo Velázquez, Alejandro; Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Barbat Barbat, Horia Alejandro (2020-04)
      Article
      Open Access
      The results of a predictive analysis of the mock-up of a reactor containment building, based on computer numerical simulation, are presented in this paper and compared with the results obtained in the context of the VeRCoRs ...
    • Analysis of ultra low cycle fatigue problems with the barcelona plastic damage model 

      Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbu, Lucia Gratiela; Barbat Barbat, Horia Alejandro (CIMNE, 2013)
      Conference report
      Open Access
      This paper presents a plastic formulation based on the Barcelona plastic damage model ([1], [2]) capable of predicting the material failure due to Ultra Low Cycle Fatigue. This is achieved taking into account the fracture ...
    • Analysis of ultra low cycle fatigue problems with the Barcelona plastic damage model 

      Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbu, Lucia Gratiela; Barbat Barbat, Horia Alejandro (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2013)
      Conference report
      Open Access
      This paper presents a plastic formulation based on the Barcelona plastic damage model capable of predicting the material failure due to Ultra Low Cycle Fatigue. This is achieved taking into account the fracture energy ...
    • Analysis of Ultra Low Cycle Fatigue problems with the Barcelona plastic damage model and a new isotropic hardening law 

      Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbu, Lucia Gratiela; Barbat Barbat, Horia Alejandro; de Jesus, A.M.P. (2015-04)
      Article
      Open Access
      This paper presents a plastic-damage formulation and a new isotropic hardening law, based on the Barcelona plastic damage model initially proposed by Lubliner et al. (1989) [1], which is capable of predicting steel failure ...
    • Análisis numérico de Eco-composites con procedimientos de homogeneización 

      Barbu, Lucia Gratiela; Martínez García, Javier; Oller Martínez, Sergio Horacio (2020-01)
      Article
      Open Access
      Los procedimientos de homogeneización han ido ganando cada vez más énfasis en el campo del análisis numérico de los materiales compuestos. Un procedimiento de homogenización se basa sobre la hipótesis de que existe un set ...
    • Coupled plastic damage model for low and ultra-low cycle seismic fatigue 

      Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2014)
      Conference report
      Open Access
      This paper presents the theoretical framework for a coupled plastic damage constitutive model valid for materials subjected to cyclic loads that lead to low and ultra-low cycle fatigue. Two numerical examples were presented ...
    • El comportamiento de las presas de Baserca y Llauset en los nuevos escenarios energéticos 

      Suárez Arroyo, Benjamín; Miquel Canet, Juan; González Lopez, Jose Manuel; Barbu, Lucia Gratiela; Buil, J.M.; Rio, J.F.; Batlle, M.T. (Sociedad Española de Métodos Numéricos en Ingeniería (SEMNI), 2013)
      Conference report
      Open Access
      Las crecientes demandas energéticas están promoviendo nuevas estrategias comerciales en la explotación de las infraestructuras hidráulicas que se materializan aumentando el protagonismo de los saltos reversibles en la ...
    • Failure pressure analysis of a nuclear reactor prestressed concrete containment building 

      Jiménez Reyes, Sergio; Cornejo Velázquez, Alejandro; Barbu, Lucia Gratiela; Barbat Barbat, Horia Alejandro; Oller Martínez, Sergio Horacio (Elsevier, 2021-06)
      Article
      Restricted access - publisher's policy
      The failure analysis of an existing and operational nuclear power plant reactor containment building subjected to an accident internal pressure is studied in this paper. The computation is based on the Finite Element Method ...
    • Fatigue analysis of a naval composite structure 

      Jurado Granados, Joel; Martínez García, Javier; Barbu, Lucia Gratiela; Capua, Daniel di (CRC Press, 2020)
      Conference report
      Restricted access - publisher's policy
      The use of composite materials in marine industry has many potential benefits, such as lower weight. However, there are still some failure mechanisms, such as fatigue, that are not yet completely under- stood. This work ...
    • Fatigue prediction of composite materials, based on serial/parallel mixing theory 

      Jurado Granados, Joel; Martínez García, Javier; Barbu, Lucia Gratiela; Capua, Daniel di (2022-03-31)
      Article
      Restricted access - publisher's policy
      In this work, a numerical procedure to obtain the fatigue performance of composite laminates is proposed. The formulation used is based on the Serial/Parallel Mixing Theory (SP-RoM) and a fatigue damage model. The SP-RoM ...
    • High cycle fatigue simulation: a new stepwise load-advancing strategy 

      Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (2015-08)
      Article
      Open Access
      A stepwise load-advancing strategy for cyclic loading will be presented in this paper that yields convergence in reasonable computational time for highly nonlinear behaviour occurring past the S–N curve. The algorithm is ...
    • High-cycle fatigue constitutive model and a load-advance strategy for the analysis of unidirectional fiber reinforced composites subjected to longitudinal loads 

      Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (2019-07)
      Article
      Open Access
      A fatigue constitutive model valid for the composite constituent will be presented in this paper. The composite behaviour will be obtained by means of the serial/parallel mixing theory that is also used as a constitutive ...
    • Large scale validation of a new isotropic hardening law for the barcelona plastic damage model under ultra low cycle fatigue conditions 

      Barbu, Lucia Gratiela; Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbat Barbat, Horia Alejandro (CIMNE, 2015)
      Conference report
      Open Access
      This paper presents the results of finite element simulations made on a bent pipe subjected to an in-plane variable cyclic displacement combined with internal pressure. The results of the numerical analyses will be compared ...
    • Methodology for the analysis of post-tensioned structures using a constitutive serial-parallel rule of mixtures 

      Cornejo, Alejandro; Barbu, Lucia Gratiela; Escudero Torres, Cuauhtemoc; Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbat Barbat, Horia Alejandro (2018-09)
      Article
      Open Access
      The main purpose of this paper is to develop a reliable method based on a three-dimensional (3D) finite-element (FE) model to simulate the constitutive behaviour of reinforced concrete structures strengthened with ...
    • Methodology for the analysis of post-tensioned structures using a constitutive serial-parallel rule of mixtures: large scale non-linear analysis 

      Barbu, Lucia Gratiela; Cornejo Velázquez, Alejandro; Martínez García, Javier; Oller Martínez, Sergio Horacio; Barbat Barbat, Horia Alejandro (2019-05)
      Article
      Open Access
      The main purpose of this paper is to develop a reliable method based on a three-dimensional (3D) finite-element (FE) model to simulate the constitutive behaviour of reinforced concrete structures strengthened with ...
    • Model-wise algorithm for the resolution of fatigue problems 

      Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (CIMNE, 2015)
      Conference report
      Open Access
      The present work presents a general constitutive model formulation and a numerical algorithm for automatically selecting the appropriate coupling of damage and plasticity as a function of the number of cycles the material ...
    • Numerical simulation of fatigue processes : application to steel and composite structures 

      Barbu, Lucia Gratiela (Universitat Politècnica de Catalunya, 2016-02-01)
      Doctoral thesis
      Open Access
      The present thesis aims at advancing an innovative computational methodology that simulates steel and composite material fracture under cyclic loading following a phenomenological approach, with calibration from both small ...
    • On the numerical study of fatigue process in rail heads by means of an isotropic damage based high-cycle fatigue constitutive law 

      Jiménez Reyes, Sergio; Barbu, Lucia Gratiela; Cornejo Velázquez, Alejandro; Oller Martínez, Sergio Horacio (Elsevier, 2022-01)
      Article
      Restricted access - publisher's policy
      The fatigue phenomenon has been historically related to the railway industry. Nowadays, thanks to the high quality of the materials used, most of the recorded problems have been overcome although there are still degradation ...
    • Stepwise advancing strategy for the simulation of fatigue problems 

      Barbu, Lucia Gratiela; Oller Martínez, Sergio Horacio; Martínez García, Javier; Barbat Barbat, Horia Alejandro (Centre Internacional de Mètodes Numèrics en Enginyeria (CIMNE), 2013)
      Conference report
      Open Access
      A time advance strategy for cyclic loading will be presented, applied to the fatigue formulation first proposed by [1].The coupling of both formulations provides a comprehensive approachto simulate high cycle fatigue ...