Browsing by Author "Cruchaga, Marcela A."

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    Analysis of Flow Past Oscillatory Cylinders Using a Finite Element Fixed Mesh Formulation
    (2017) González, Felipe A.; Cruchaga, Marcela A.; Celentano, Diego J.
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    Bending and pressurisation test of the human aortic arch: experiments, modelling and simulation of a patient-specific case
    (2013) Garcia-Herrera, Claudio M.; Celentano, Diego J.; Cruchaga, Marcela A.
    This work presents experiments, modelling and simulation aimed at describing the mechanical behaviour of the human aortic arch during the bending and pressurisation test. The main motivation is to describe the material response of this artery when it is subjected to large quasi-static deformations in three different stages: bending, axial stretching and internal pressurisation. The sample corresponds to a young artery without cardiovascular pathologies. The pressure levels are within the normal and hypertension physiological ranges. The two principal findings of this work are firstly, the material characterisation performed via tensile test measurements that serve to derive the material parameters of a hyperelastic isotropic constitutive model and, secondly, the assessment of these material parameters in the simulation of the bending and pressurisation test. Overall, the reported material characterisation was found to provide a realistic description of the mechanical behaviour of the aortic arch under severe complex loading conditions considered in the bending and pressurisation test.
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    Bilinear damage evolution in AA2011 wire drawing processes
    (2022) Gonzalez, Alvaro A.; Cruchaga, Marcela A.; Celentano, Diego J.
    This paper presents an experimental and numerical analysis of damage evolution in AA2011 aluminum alloy wires drawn under different scenarios. To this end, load-unload tensile tests were firstly carried out in order to characterize the degradation of the mechanical response in every cycle where the experimental results show a bilinear damage relationship in terms of the effective plastic strain. Therefore, a modification of the classical Lemaitre model is proposed in this work in order to reproduce bilinear paths of damage with the addition of only two parameters that can be directly obtained from the material characterization. Then, the damage predictive capability of this new experimental-based model is assessed in numerical simulations of the drawing process in one and two passes (considering for this last case the sequential and tandem configurations) where the computed predictions are compared with the corresponding experimental data showing a good agreement between them.
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    Simulation and experimental validation of the motion of immersed rigid bodies in viscous flows
    (ELSEVIER SCIENCE SA, 2008) Cruchaga, Marcela A.; Munoz, Christian M.; Celentano, Diego J.
    In this work we present the numerical analysis of the motion of a rigid body immersed in a viscous fluid. The fluid flow induced by the gravity-driven motion of a rigid body is particularly analysed using cylinders and spheres. The Navier-Stokes equations coupled with the interface motion are solved in the framework of a finite element formulation. The interface of the rigid body is represented using a moving Lagrangian interface technique (MLIT). The proposed formulation is applied to describe the two-dimensional motion of a cylinder between parallel walls as well as the axisymmetric representation of a sphere assessing in both cases the effects of the walls distance on the velocity developed by such bodies. The numerical predictions are verified using different models for the analysis of the problem, and are validated by comparison with theoretical-empirical correlations. Moreover, the computed body velocities are compared with experimental data reported in the literature as well as measurements obtained from experiments carried out in the framework of the present work. (C) 2008 Elsevier B.V. All rights reserved.