Javier Segurado
Finite element methodDeformation (engineering)DislocationComposite materialRepresentative elementary volumeFlow stressHardening (metallurgy)MetallurgyMaterials scienceDeformation mechanismCondensed matter physicsMicromechanicsHomogenization (chemistry)Slip (materials science)MechanicsFast Fourier transformPlasticityCrystallographyVoid (astronomy)Microstructure
Publications 100
#1S. LucariniH-Index: 6
Last. Javier SeguradoH-Index: 33
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An FFT framework which preserves a good numerical performance in the case of domains with large regions of empty space is proposed and analyzed for its application to lattice based materials. Two spectral solvers specially suited to resolve problem containing phases with zero stiffness are considered (1) a Galerkin approach combined with the MINRES linear solver and a discrete differentiation rule and (2) a modification of a displacement FFT solver which penalizes the indetermination of strains ...
#1Ling Wu (University of Liège)H-Index: 14
#2Lucia Cobian (IMDEA)
Last. Ludovic Noels (University of Liège)H-Index: 24
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#1Qianran Yu (UCLA: University of California, Los Angeles)H-Index: 1
#2Enrique Martínez (Clemson University)H-Index: 22
Last. Jaime Marian (UCLA: University of California, Los Angeles)H-Index: 32
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The deformation of crystalline materials by dislocation motion takes place in discrete amounts determined by the Burgers vector. Dislocations may move individually or in bundles, potentially giving rise to intermittent slip. This confers plastic deformation with a certain degree of variability that can be interpreted as being caused by stochastic fluctuations in dislocation behavior. However, crystal plasticity (CP) models are almost always formulated in a continuum sense, assuming that fluctuat...
#1M. Magri (IMDEA)H-Index: 4
#2S. Lucarini (IMDEA)H-Index: 6
Last. Javier SeguradoH-Index: 33
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The simulation of fracture using continuum ductile damage models attains a pathological discretization dependence caused by strain localization, after loss of ellipticity of the problem, in regions whose size is connected to the spatial discretization. Implicit gradient techniques suppress this problem introducing some inelastic non-local fields and solving an enriched formulation where the classical balance of linear momentum is fully coupled with a Helmholtz-type equation for each of the non-l...
3 CitationsSource
#1Javier Segurado (IMDEA)H-Index: 33
#2Ricardo A. Lebensohn (LANL: Los Alamos National Laboratory)H-Index: 61
A method based on the Fast Fourier Transform is proposed to obtain the dispersion relation of acoustic waves in heterogeneous periodic media with arbitrary microstructures. The microstructure is explicitly considered using a voxelized Representative Volume Element (RVE). The dispersion diagram is obtained solving an eigenvalue problem for Bloch waves in Fourier space. To this aim, two linear operators representing stiffness and mass are defined through the use of differential operators in Fourie...
The critical resolved shear stress of an Al 4 wt. \% Cu alloy containing a homogeneous distribution of \theta''precipitates was determined by means of dislocation dynamics simulations. The size distribution, shape, orientation and volume fraction of the precipitates in the alloy were obtained from transmission electron microscopy observations while the parameters controlling the dislocation/precipitate interactions (elastic mismatch, transformation strains, dislocation mobility and cross-slip...
1 CitationsSource
#1Meijuan Zhang (IMDEA)H-Index: 3
#2K. Nguyen (UPM: Technical University of Madrid)H-Index: 6
Last. Francisco J. Montáns (UPM: Technical University of Madrid)H-Index: 19
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The purpose of continuum plasticity models is to efficiently predict the behavior of structures beyond their elastic limits. The purpose of multiscale materials science models, among them crystal plasticity models, is to understand the material behavior and design the material for a given target. The current successful continuum hyperelastoplastic models are based in the multiplicative decomposition from crystal plasticity, but significant differences in the computational frameworks of both appr...
4 CitationsSource
#1V. Herrera-Solaz (Paul Scherrer Institute)H-Index: 6
#2Carmen M. Cepeda-Jiménez (IMDEA)H-Index: 24
Last. Markus Niffenegger (Paul Scherrer Institute)H-Index: 18
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Abstract The objective of this work is to assess the accuracy of different approaches to represent the microstructure of a polycrystalline sample using EBSD (electron backscatter diffraction) maps of a single external surface as input. To this aim, the stress and strain fields predicted using the finite element method and considering either columnar grains, extruded from the surface, or synthetic, obtained by random misorientation through the thickness of the surface grains, are compared with th...
#1Rafael Sancho (UPM: Technical University of Madrid)H-Index: 2
#2Javier Segurado (UPM: Technical University of Madrid)H-Index: 33
Last. Francisco Gálvez (UPM: Technical University of Madrid)H-Index: 18
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The flow stress behaviour of a directionally solidified nickel-base superalloy, MAR-M247, is presented through the combination of experiments and crystal-plasticity simulations. The experimental campaign encompassed quasi-static and dynamic testing in the parallel and perpendicular orientation with respect to the columnar grains. The material showed low strain-rate sensitivity in all cases. Virtual samples were generated with DREAM3d and each grain orientation was established according to the DS...