• 3D numerical study of the transient behaviour on plasticity induced crack closure 

      Camas, Daniel; Antunes, Fernando; Lopez-Crespo, Pablo; Gonzalez-Herrera, Antonio (2019-07-05)
      The numerical analysis of the plasticity induced crack closure requires the development of the plastic wake. Transient behaviour is observed when the crack starts to grow. The plastic wake length has an influence on the ...
    • A numerical analysis of the plastic wake influence on plasticity induced crack closure 

      Camas, Daniel; Antunes, F.V.; Lopez-Crespo, Pablo; Gonzalez-Herrera, Antonio (2017-09-18)
      Fatigue crack closure has been studied by means of finite element method since long time ago. Most work has been performed considering bi-dimensional models. Lately, the use of threedimensional models has been extended. ...
    • A numerical analysis of the relation between CTOD and fatigue crack growth 

      Camas, Daniel; Antunes, F.V.; Rodrigues, S.M. (2016-03-30)
      El cálculo de la vida a fatiga durante la etapa de propagación de la grieta se suele realizar relacionando da/dN con ΔK. Sin embargo, la influencia que en estos análisis tiene el parámetro ΔK debe recaer en algún otro ...
    • Correlation between the pivot node concept and fatigue crack closure 

      Camas, Daniel; Gozalez-Herrera, Antonio; García-Manrique-Ocaña, José Manuel (2018-10-05)
      The study of fatigue crack growth has been commonly done by means of bi-dimensional models and assuming a homogeneous behaviour through the thickness. According to the specimen thickness, a state of plane stress or plane ...
    • Determinación experimental de la carga de apertura de grieta en fatiga bajo cargas aleatorias 

      Cruces, A S; Camas, Daniel; Lopez-Crespo, Pablo; Zapatero, J.; Moreno-Morales, Maria Belen (2019-05-02)
      El concepto de carga de apertura o cierre de grieta es ampliamente utilizado en fatiga para justificar el comportamiento del crecimiento de grietas con distintas relaciones de carga y el efecto de interacción de las cargas. ...
    • Evaluación de la zona plástica en fatiga para un acero bainitico mediante difracción de rayos x 

      Carrera, M; Lopez-Crespo, Pablo; Camas, Daniel; Zapatero, J.; Moreno-Morales, Maria Belen (2019-05-02)
      En este artículo se presenta una nueva metodología para medir la zona plástica de una grieta en fatiga. Se han adquirido datos de difracción de rayos X sincrotrón para una probeta Compact Tension de acero bainítico, en ...
    • Experimental and analytical study of cracks under biaxial fatigue 

      Mokhtarishirazbad, M; Lopez-Crespo, Pablo; Moreno-Morales, Maria Belen; Camas, Daniel; Lopez-Moreno, A; [et al.] (GIF, 2016)
      Most mechanical components experience multi-axial cyclic loading conditions during service. Experimental analysis of fatigue cracks under such conditions is not easy and most works tend to focus more on the simpler but ...
    • Fatigue crack propagation analysis in 2024-T351 aluminium alloy using nonlinear parameters 

      Borges, Micael Frias; Lopez-Crespo, Pablo; Antunes, Fernando Ventura; Moreno-Morales, Maria Belen; Prates, P. A.; [et al.] (ELSEVIER, 2021-12)
      In this work, fatigue crack growth (FCG) in the 2024-T351 aluminium alloy is studied using the plastic CTOD range, Δδp. Experimental tests were performed on 12 mm thick CT specimens in order to obtain FCG rate and in ...
    • Influence of the mesh size on plastic CTOD 

      Sanchez-Mancera, J.; Camas, Daniel; Prates, P.A.; Antunes, F.V. (ICSI2021 book of abstracts: PMGP Moreira and PJS Tavares, 2021)
      The Crack Tip Opening Displacement (CTOD) is an elastic-plastic fracture mechanics parameter usually employed as a measurement of fracture toughness and to explain the fatigue crack growth. This parameter can be decomposed ...
    • INFLUENCE OF THREE DIMENSIONAL FINITE ELEMENT MESH SIZE ON PLASTICITY INDUCED CRACK CLOSURE PHENOMENON 

      Camas, Daniel; Gonzalez-Herrera, Antonio (2013-09-04)
      In the present work, a CT aluminium specimen has been modelled three-dimensionally and several calculations have been made in order to evaluate the influence of the mesh size around the crack front. The numerical accuracy ...
    • Influencia del tamaño mínimo de elemento en el análisis tridimensional por elementos finitos del cierre de grieta inducido por plasticidad 

      Camas, Daniel; Lopez-Crespo, Pablo; Moreno-Morales, Maria Belen; Zapatero, J.; Gonzalez-Herrera, Antonio (2014-04-10)
      Debido al incremento de la capacidad computacional disponible hoy en día, en los últimos años se ha extendido el uso de modelos tridimensionales para el análisis del cierre de grieta en fatiga empleando el método de los ...
    • Key aspects in 3D fatigue crack closure numerical modelling 

      Camas, Daniel; Gonzalez-Herrera, Antonio; García-Manrique-Ocaña, José Manuel (2018-09-14)
      Since long time, fatigue crack closure has been studied by means of finite element models. Initially by bi-dimensional models and recently, due to the higher computational capabilities, the use of three-dimensional models ...
    • Numerical analysis of the influence of the last cycle scheme on plasticity induced crack closure 

      Camas, Daniel; Antunes, Fernando; Moreno-Morales, Maria Belen; Gonzalez-Herrera, Antonio (2019-09-24)
      Plasticity induced crack closure is considered the main mechanism related to the premature contact of the crack flanks when a crack grows under cyclic loadings. This phenomenon has been studied numerically since the early ...
    • Numerical analysis of the pivot node in fracture problems 

      Camas, Daniel; Gonzalez-Herrera, Antonio; García-Manrique-Ocaña, José Manuel; Lima-Rodríguez, Antonia (2018-09-14)
      Recent studies have allowed us to identify a narrow region of the thickness of the crack front in fracture problems that presents interesting characteristics for the numerical-experimental correlation. Taking the ...
    • Sobrecargas en crecimiento de grietas por fatiga biaxial 

      Mokhtarishirazabad, M.; Lopez-Crespo, Pablo; Moreno-Morales, Maria Belen; Zapatero, J.; Camas, Daniel; [et al.] (Secretaría del Grupo Español de Fractura, 2017)
      El presente trabajo se centra en el estudio de grietas de fatiga bajo cargas biaxiales. Se presenta una nueva metodología para evaluar el efecto de las sobrecargas basada en la evaluación experimental del factor de ...
    • Through thickness evolution of crack tip plasticity 

      Camas, Daniel; Lopez-Crespo, Pablo; Antunes, F.V.; Yates, John R. (2017-07-19)
      Experimental methods to measure fracture mechanics parameters tend to provide information from or about the surface of cracked components. However, information about the interior of the component is key to understanding ...