Sergio Lucarini

Sergio Lucarini
Basque Center for Materials, Applications and Nanostructures | BCMaterials

Doctor of Engineering

About

36
Publications
15,027
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879
Citations
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September 2023 - present
Basque Center for Materials, Applications and Nanostructures
Position
  • Ikerbasque Research Fellow

Publications

Publications (36)
Article
Full-text available
The effective electric resistivity of conductive thermoplastics manufactured by filament extrusion methods is determined by both the material constituents and the printing parameters. The former determines the multifunctional nature of the composite, whereas the latter dictates the mesostructural characteristics such as filament adhesion and void d...
Article
Full-text available
We present a wrapper that allows Abaqus user material subroutines (UMATs) to be used as an External Material library in the software COMSOL Multiphysics. The wrapper, written in C language, transforms COMSOL’s external material subroutine inputs and outputs into Fortran-coded Abaqus UMAT inputs and outputs, by means of a consistent variable transfo...
Article
Full-text available
Additive manufacturing has enabled the design of thermoplastic components that provide structural support, electrical conductivity and heat generation modulated by mechanical deformation. The mechanisms and interplays that govern the material response at the microstructural level remain, however, elusive. Here, we develop an experimental method to...
Preprint
A novel FFT-based phase-field fracture framework for modelling fatigue crack initiation and propagation at the microscale is presented. A damage driving force is defined based on the stored energy and dislocation density, relating phase-field fracture with microstructural fatigue damage. The formulation is numerically implemented using FFT methods...
Experiment Findings
Full-text available
Using a novel FFT-base Crystal Plasticity phase-field framwork based on the streored energy density microstructural short crack gowth can be captured. Strain-controlled computational fatigue (14th cycle) of a 3D microsructure: fatigue crack meandering through the microstructure.
Article
Full-text available
Magnetorheological elastomers (MREs) are multifunctional composites that consist of an elastomeric matrix filled with magnetic particles. These materials respond to an external magnetic field by mechanically deforming and/or changing their magnetorheological properties. Such a multi-physical response has made them extraordinary candidates for a wid...
Article
Full-text available
Biological cells and tissues are continuously subjected to mechanical stress and strain cues from their surrounding substrate. How these forces modulate cell and tissue behavior is a major question in mechanobiology. To conduct studies under controlled varying physiological strain scenarios, a new virtually-assisted experimental system is proposed...
Article
Full-text available
An FFT based polycrystalline homogenization framework is proposed to predict the temperature-dependent response of SLM parts fabricated in Hastelloy-X, and to ascertain the origin of the differences in the mechanical response experimentally observed for different printing directions and part thicknesses. Several specimens are considered, built and...
Article
Full-text available
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 problems containing phases with zero stiffness are considered (1) a Galerkin approach combined with the MINRE...
Article
Full-text available
FFT methods have become a fundamental tool in computational micromechanics since they were first proposed in 1994 by Moulinec and Suquet for the homogenization of composites. Since then many different approaches have been proposed for a more accurate and efficient resolution of the non-linear homogenization problem. Furthermore, the method has been...
Article
Full-text available
Hard-magnetic soft composites consist of magneto-active polymers (MAPs) where the fillers are composed of hard-magnetic (magnetically polarised) particles. These novel multifunctional materials are experiencing a great advance from the last few years. This rise has been motivated by the possibility of controlling ferromagnetic patterns during the m...
Preprint
Full-text available
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 problems containing phases with zero stiffness are considered (1) a Galerkin approach combined with the MINRE...
Article
Full-text available
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 an...
Preprint
Full-text available
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 an...
Article
Full-text available
A novel approach has been developed to estimate fatigue life at the specimen/component level from the simulation of relatively small Representative Volume Elements (RVE) of the polycrystalline microstructure. This technique allows to estimate the statistical distribution of fatigue lives under general multiax-ial loading conditions accounting for b...
Thesis
Full-text available
The fatigue behavior of a polycrystalline alloy is strongly dependent on its microstructure, in particular on the grain size, shape and orientation distributions. The experimental characterization of the fatigue performance requires a large experimental campaign that should be repeated for each of the metallic microstructures of interest. Micromech...
Article
Full-text available
The influence of grain size on the flow stress of various FCC polycrystals (Cu, Al, Ag and Ni) has been analyzed by means of computational homogenization of a representative volume element of the microstructure using a FFT approach in combination with a strain gradient crystal plasticity model. The density of geometrically necessary dislocations re...
Preprint
Full-text available
The influence of grain size on the flow stress of various FCC polycrystals (Cu, Al, Ag and Ni) has been analyzed by means of computational homogenization of a representative volume element of the microstructure using a FFT approach in combination with a strain gradient crystal plasticity model. The density of geometrically necessary dislocations re...
Article
Full-text available
Most of the FFT methods available for homogenization of the mechanical response use the strain/deformation gradient as unknown, imposing their compatibility using Green's functions or projection operators. This implies the allocation of redundant information and, when the method is based in solving a linear equation, the rank-deficiency of the resu...
Preprint
Full-text available
Most of the FFT methods available for homogenization of the mechanical response use the strain/deformation gradient as unknown, imposing their compatibility using Green's functions or projection operators. This implies the allocation of redundant information and, when the method is based in solving a linear equation, the rank-deficiency of the resu...
Conference Paper
Full-text available
Se ha desarrollado un modelo basado en la aproximación "weakest link"para estimar la vida en fatiga a nivel de espécimen o componente. El modelo se apoya en la micromecánica computacional donde el comportamiento macroscópico se obtiene mediante la simulación de Elementos Representativos de la microestructura policristalina (RVE). El comportamiento...
Article
A new algorithm is proposed to impose a macroscopic stress or mixed stress/deformation gradient history in the context of non‐linear Galerkin based FFT homogenization. The method proposed is based in the definition of a modified projection operator in which the null frequencies enforce the type of control (stress or strain) for each component of ei...
Article
Full-text available
A framework based on FFT is proposed for micromechanical fatigue modeling of polycrystals as alternative to the Finite Element method (FEM). The variational FFT approach [1, 2] is used with a crystal plasticity model for the cyclic behavior of the grains introduced through a FEM material subroutine, in particular an Abaqus umat. The framework also...
Preprint
Full-text available
A new algorithm is proposed to impose a macroscopic stress or mixed stress/deformation gradient history in the context of non-linear Galerkin based FFT homogenization. The method proposed is based in the definition of a modified projection operator in which the null frequencies enforce the type of control (stress or strain) for each component of ei...
Preprint
Full-text available
A framework based on FFT is proposed for micromechanical fatigue modeling of polycrystals as alternative to the Finite Element method (FEM). The variational FFT approach is used with a crystal plasticity model for the cyclic behavior of the grains introduced through a FEM material subroutine, in particular an Abaqus umat. The framework also include...
Article
The development of new interatomic potentials to model metallic systems is a difficult task, due in part to the dependence between the parameters that desbribe the electron density and the short-range interactions. The problem of finding adequate parameters becomes very complicated, and the iterative methods commonly employed to do that can get stu...
Article
Full-text available
A microstructure-based model that accounts for the effect of grain size has been developed to study the effect of grain size on the fatigue life of Inconel 718 alloys. The fatigue behavior of two alloys with different grain size was determined by means of uniaxial cyclic deformation tests under fully-reversed deformation ($R_\varepsilon$ = -1) at 4...
Preprint
A microstructure-based model that accounts for the effect of grain size has been developed to study the effect of grain size on the fatigue life of Inconel 718 alloys. The fatigue behavior of two alloys with different grain size was determined by means of uniaxial cyclic deformation tests under fully-reversed deformation ($R_\varepsilon$ = -1) at 4...
Article
Full-text available
A microstructure-based model is presented to predict the fatigue life of polycrystalline metallic alloys which present a bilinear Coffin-Manson relationship. The model is based in the determination of the maximum value of a fatigue indicator parameter obtained from the plastic energy dissipated by cycle in the microstructure. The fatigue indicator...
Preprint
Full-text available
A microstructure-based model is presented to predict the fatigue life of polycrystalline metallic alloys which present a bilinear Coffin-Manson relationship. The model is based in the determination of the maximum value of a fatigue indicator parameter obtained from the plastic energy dissipated by cycle in the microstructure. The fatigue indicator...
Conference Paper
Full-text available
Se ha desarrollado una herramienta para la predicción de la vida en fatiga de la superaleación In718. La herramienta parte de un modelo del comportamiento cíclico de la superaleación basado en la simulación por elementos finitos de volúmenes representativos (RVEs) de la microestructura policristalina. El comportamiento de los granos se ha simulado...

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