Vicente Francisco González Albuixech

• Doctor
• Associated professor (tenured not a civil servant) at Universidad Politécnica de Madrid

The aim of this study is the analysis of the convergence rates achieved with domain energy integrals for the computation of the stress intensity factors (SIF) when solving 2-D curved crack problems with the extended FEM (XFEM). Domain integrals, specially the J-integral and the interaction integral, are widely used for SIF extraction and provide hi...

Metal additive manufacturing has emerged as a revolutionary technology for the fabrication of high-complexity components. However, this technique presents unique challenges related to the structural integrity and final strength of the parts produced due to inherent defects, such as porosity, cracks, and geometric deviations. These defects significa...

The fracture of structures under mixed‐mode loaded cracks is usually assessed using stress intensity factors (SIFs). Domain integrals, specially the J‐integral and the interaction integral, are widely used for SIF extraction and provide high accurate estimations with finite element methods, although the J‐integral does not allow the separation of t...

The fracture of structures under mixed-mode loaded cracks is usually assessed using stress intensity factors (SIF). Domain integrals, specially the \J-integral and the interaction integral, are widely used for SIF extraction and provide high accurate estimations with finite element methods, although the \J-integral does not allow the separation of...

Metamaterials are generated from an interrelated set of cells and can present a macroscopic behaviour that differs from the one that characterizes its basic constituents. Modelling the influence that the damage and fracture of the elemental constituents have in the macroscopic properties of the metamaterial is relevant for its mechanical analysis....

In this work, the influence of crack propagation velocity in the stress intensity factor has been studied. The analysis is performed with a lattice method and a linear elastic constitutive model. Numerous researchers determined the relationship between the dynamic stress intensity factor and crack propagation velocity with experimental and analytic...

The exigent requirements for personal protections in terms of energy absorption and ergonomics have led to increasing interest in bioinspired protections. This work focuses on the numerical analysis of ballistic behavior of different bioinspired geometries under impact loadings. Ceramic armors based on ganoid fish scales (the type exhibited by gars...

The work relates to the effect of temperature on the model parameters in local approaches (LAs) to cleavage fracture. According to a recently developed LA model, the physical consensus of plastic deformation being a prerequisite to cleavage fracture enforces any LA model of cleavage fracture to observe initial yielding of a volume element as its th...

One potential challenge to the integrity of the reactor pressure vessel (RPV) of a pressurized water reactor is posed by a pressurized thermal shock (PTS), which is associated with rapid cooling of sections of the hot and still pressurized RPV by injection of relatively cold emergency coolant. PTS transients lead to high tensile circumferential and...

The work relates to the effect of temperature on the model parameters in local approaches (LAs) to cleavage fracture. According to a recently developed LA model, the physical consensus of plastic deformation being a prerequisite to cleavage fracture enforces any LA model to cleavage fracture to observe initial yielding of a volume element as its th...

One potential challenge to the integrity of a reactor pressure vessel (RPV) of a pressurized water reactor is posed by a pressurized thermal shock (PTS), which is associated with severe cooling of the RPV followed by its repressurization. PTS transients lead to high tensile circumferential and axial stresses in the RPV wall. If the stress intensity...

El level set method es una técnica que se utiliza habitualmente para describir matemáticamente la propagación de superficies mediante la aproximación y resolución de ecuaciones diferenciales. Esta técnica ha sido ampliamente utilizada en combinación con el XFEM, especialmente en el análisis del crecimento de grietas. Sin embargo, existen otras opci...

El XFEM es una técnica desarrollada para la simulación numérica de problemas relacionados con la mecánica de la fractura. Este método tiene diversas ventajas, pero también aparecen ciertas cuestiones que deben ser abordadas con cuidado. La integración numérica de los elementos enriquecidos es uno de esos puntos. En este trabajo se han comparado dos...

Excitations of disordered systems such as glasses are of fundamental and practical interest but computationally very expensive to solve. Here we introduce a technique for modeling these excitations in an infinite disordered medium with a reasonable computational cost. The technique relies on a discrete atomic model to simulate the low-energy behavi...

The fracture mechanic analysis of a reactor pressure vessel subjected to pressurized thermal shock (PTS) loading is one of the most important issues for the assessment of life time extension of a nuclear power plant. The most severe scenario occurs during cold water injection in the cold leg due to a Loss-Of-Coolant Accident (LOCA). Two hypothetica...

The fracture mechanic analysis of a reactor pressure vessel subjected to pressurized thermal shock loading is one of the most important issues for the assessment of life time extension of a nuclear power plant. The most severe scenario occurs during cold water injection in the cold leg due to a Loss-Of-Coolant Accident (LOCA). In the present study...

The inner surface of a reactor pressure vessel (RPV) is assumed to be subjected to pressurized thermal shocks (PTSs) caused by the injection of emergency cooling water. The downstream is not homogeneous but typically in a plume shape coming from the inlet nozzles. In this paper, both deterministic and probabilistic methods are used to assess the in...

The inner surface of a reactor pressure vessel (RPV) is assumed to be subjected to pressurized thermal shocks (PTSs) caused by the downstream of emergency cooling water. The downstream is not homogeneous but typically in a plume shape coming from the inlet nozzles. In this paper, both deterministic and probabilistic methods are used to assess the...

Excitations of disordered systems such as glasses are of fundamental and practical interest but computationally very expensive to solve. Here we introduce a technique for modeling these excitations in an infinite disordered medium with a reasonable computational cost. The technique relies on a discrete atomic model to simulate the low-energy behavi...

The calibration of local approaches to cleavage fracture is important topic in structural integrity analysis. In this paper, a method to calibrate the Beremin model based on the Master Curve is studied. The temperature dependence of Beremin model parameters is investigated in the ductile-to-brittle (DBT) transition region. The Weibull modulus, m, i...

The bias energies of various two-level systems (TLSs) and their strengths of interactions with the strain are calculated for Ar:N2 glass. Unlike the case in KBr:CN, a distinct class of TLSs having weak interaction with the strain and untypically small bias energies is not found. The addition of CO molecules introduces CO flips which form such a cla...

One type of singularity that may appear in a three-dimensional fracture problem under elastic behavior is the free corner singularity, which occurs at the intersection of the crack with a free boundary and whose effect is usually ignored. The extended finite element method (XFEM) is a technique that allows the efficient numerical modeling of fractu...

Abstract Transferability of fracture toughness data obtained on small scale specimens to a full-scale cracked structure involves both in-plane and out-of-plane constraint effects. Both in-plane and out-of-plane constraint effects of a crack in a reference reactor pressure vessel (RPV) subjected to pressurized thermal shock (PTS) are analyzed by two...

Abstract The integrity of an reactor pressure vessel (RPV) related to Pressurized Thermal Shocks (PTSs) has been widely studied. However, due to the difficulties associated with the crack modeling with the 3-D finite element method (FEM), it is preferred to use models with simple geometries and crack configurations. In the last years new improved F...

The strengths of the interactions of various two-level systems (TLSs) with the strain are calculated for Ar:N$_2$ glass. Unlike the case in KBr:CN, a continuous --rather than bimodal-- spectrum is obtained. The addition of CO molecules introduces CO flips as a separate class of weakly interacting TLSs, albeit at much lower coupling than are typical...

Transferability of fracture toughness data obtained on small scale specimens to a full-scale cracked structure is one of the key issues in integrity assessment of engineering structures. In order to transfer fracture toughness under different constraints, both in-plane and out-of-plane constraint effect should be considered for the specimens and st...

Abstract The computation of stress intensity factors (SIFS) in curved and non-planar cracks using domain integrals introduces some difficulties related to the use of curvilinear gradients. Several approaches exist in the literature that consider curvilinear corrections within a finite element framework, but these depend on each particular crack con...

When an analysis of the 3-D crack behavior in LEFM is performed, usually only the first term of the Williams series expansion, which corresponds to the r-12 singularity, is taken into account. However, it is well known that tij stresses (second order terms) have still influence. Even when the tij stresses are introduced, the only term usually taken...