List of Journal Publications
2022
5.
Goudarzi, M., Grazioli, D., Simone, A.
An efficient computational approach for three-dimensional modeling and simulation of fibrous battery electrodes Journal Article
In: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, vol. 123, no. 7, pp. 1513–1546, 2022.
Abstract | BibTeX | Tags: embedded fiber model, fibrous electrode, Finite element method, lithium-ion battery electrodes modeling and simulation, nanowire and structural batteries | Links:
@article{Goudarzi2022,
title = {An efficient computational approach for three-dimensional modeling and simulation of fibrous battery electrodes},
author = {M. Goudarzi and D. Grazioli and A. Simone},
doi = {10.1002/nme.6881},
year = {2022},
date = {2022-01-01},
journal = {INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING},
volume = {123},
number = {7},
pages = {1513–1546},
publisher = {John Wiley and Sons Ltd},
abstract = {Fibrous electrodes are a promising alternative to conventional particle-based lithium-ion battery electrodes. In this contribution, we propose an efficient computational approach for the modeling and simulation of electrochemical phenomena taking place in fibrous electrodes during battery charge/discharge processes. Since each fiber is explicitly modeled by means of a dimensionally reduced embedded fiber model, the framework enables simulations in a three-dimensional setting with relatively modest discretization and computational requirements compared to simulations with fully resolved fiber discretizations. The approach is applied to electrodes with high volume fractions of high aspect ratio fibers. Various local and global quantities are analyzed and results are compared to those obtained with the standard finite element method and the pseudo-2D model.},
keywords = {embedded fiber model, fibrous electrode, Finite element method, lithium-ion battery electrodes modeling and simulation, nanowire and structural batteries},
pubstate = {published},
tppubtype = {article}
}
Fibrous electrodes are a promising alternative to conventional particle-based lithium-ion battery electrodes. In this contribution, we propose an efficient computational approach for the modeling and simulation of electrochemical phenomena taking place in fibrous electrodes during battery charge/discharge processes. Since each fiber is explicitly modeled by means of a dimensionally reduced embedded fiber model, the framework enables simulations in a three-dimensional setting with relatively modest discretization and computational requirements compared to simulations with fully resolved fiber discretizations. The approach is applied to electrodes with high volume fractions of high aspect ratio fibers. Various local and global quantities are analyzed and results are compared to those obtained with the standard finite element method and the pseudo-2D model.
2021
4.
Goudarzi, M., Corso, F. Dal, Bigoni, D., Simone, A.
Dispersion of rigid line inclusions as stiffeners and shear band instability triggers Journal Article
In: INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, vol. 210-211, pp. 255–272, 2021.
Abstract | BibTeX | Tags: Embedded reinforcement model, Finite element method, Material instability, Rigid line inclusions, Shear band formation | Links:
@article{Goudarzi2021,
title = {Dispersion of rigid line inclusions as stiffeners and shear band instability triggers},
author = {M. Goudarzi and F. Dal Corso and D. Bigoni and A. Simone},
doi = {10.1016/j.ijsolstr.2020.11.006},
year = {2021},
date = {2021-01-01},
journal = {INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES},
volume = {210-211},
pages = {255–272},
publisher = {Elsevier Ltd},
abstract = {A dispersion of stiff and thin (‘rigid line’) inclusions (RLIs) in a matrix material may result beneficial for stiffening in the elastic range, but might be detrimental to strength, as material instabilities may be triggered by inclusions when the matrix is brought to a viscoplastic-damaging state. This dual role of RLIs is investigated by means of the embedded reinforcement model. Validated against available analytical predictions, this numerical model is employed to assess the roles of RLIs’ orientation, interaction, volume fraction, and distribution, considering up to 1500 inclusions. When the matrix material deforms inelastically, RLIs produce stress concentrations that promote the nucleation of shear bands. These are characterized at collapse for many distributions of RLIs, showing that their effects range from almost negligible to a disrupting alteration of the dominant failure mechanism. In the latter case, it is shown that the dominant shear bands can be fragmented by RLIs into a mosaic of tiny localization bands. These results offer new insights into energy dissipation mechanisms of reinforced materials, as they are promoted or inhibited by the interactions of rigid line inclusions.},
keywords = {Embedded reinforcement model, Finite element method, Material instability, Rigid line inclusions, Shear band formation},
pubstate = {published},
tppubtype = {article}
}
A dispersion of stiff and thin (‘rigid line’) inclusions (RLIs) in a matrix material may result beneficial for stiffening in the elastic range, but might be detrimental to strength, as material instabilities may be triggered by inclusions when the matrix is brought to a viscoplastic-damaging state. This dual role of RLIs is investigated by means of the embedded reinforcement model. Validated against available analytical predictions, this numerical model is employed to assess the roles of RLIs’ orientation, interaction, volume fraction, and distribution, considering up to 1500 inclusions. When the matrix material deforms inelastically, RLIs produce stress concentrations that promote the nucleation of shear bands. These are characterized at collapse for many distributions of RLIs, showing that their effects range from almost negligible to a disrupting alteration of the dominant failure mechanism. In the latter case, it is shown that the dominant shear bands can be fragmented by RLIs into a mosaic of tiny localization bands. These results offer new insights into energy dissipation mechanisms of reinforced materials, as they are promoted or inhibited by the interactions of rigid line inclusions.
2011
3.
Radtke, F. K. F., Simone, A., Sluys, L. J.
A partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites Journal Article
In: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, vol. 86, no. 4-5, pp. 453–476, 2011.
Abstract | BibTeX | Tags: Damage, Fibre-reinforced composite, Fibre-reinforced concrete, Finite element method, Partition of unity finite element method | Links:
@article{Radtke2011,
title = {A partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites},
author = {F. K. F. Radtke and A. Simone and L. J. Sluys},
doi = {10.1002/nme.3056},
year = {2011},
date = {2011-01-01},
journal = {INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING},
volume = {86},
number = {4-5},
pages = {453–476},
abstract = {We present a partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the matrix material, the fibre material and the fibre-matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach.},
keywords = {Damage, Fibre-reinforced composite, Fibre-reinforced concrete, Finite element method, Partition of unity finite element method},
pubstate = {published},
tppubtype = {article}
}
We present a partition of unity finite element method for simulating non-linear debonding and matrix failure in thin fibre composites. Fibres are superimposed on a background mesh without meshing them. The constitutive behaviour of the matrix material, the fibre material and the fibre-matrix bond can be independently defined. A concise derivation of the discrete governing equations is given for two classes of continuum damage models describing the matrix material. A non-linear bond-slip law including debonding and fibre pull-out behaviour is used. Several examples illustrate the potential of the proposed approach.
2010
2.
F., Radtke F. K., A., Simone, J., Sluys L.
A partition of unity finite element method for obtaining elastic properties of continua with embedded thin fibres Journal Article
In: INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, vol. 84, no. 6, pp. 708–732, 2010.
Abstract | BibTeX | Tags: Fibre-reinforced composite, Finite element method, Partition of unity finite element method | Links:
@article{F.K.F.2010,
title = {A partition of unity finite element method for obtaining elastic properties of continua with embedded thin fibres},
author = {Radtke F. K. F. and Simone A. and Sluys L. J.},
doi = {10.1002/nme.2916},
year = {2010},
date = {2010-01-01},
journal = {INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING},
volume = {84},
number = {6},
pages = {708–732},
abstract = {The numerical analysis of large numbers of arbitrarily distributed discrete thin fibres embedded in a continuum is a computationally demanding process. In this contribution, we propose an approach based on the partition of unity property of finite element shape functions that can handle discrete thin fibres in a continuum matrix without meshing them. This is made possible by a special enrichment function that represents the action of each individual fibre on the matrix. Our approach allows to model fibre‐reinforced materials considering matrix, fibres and interfaces between matrix and fibres individually, each with its own elastic constitutive law.},
keywords = {Fibre-reinforced composite, Finite element method, Partition of unity finite element method},
pubstate = {published},
tppubtype = {article}
}
The numerical analysis of large numbers of arbitrarily distributed discrete thin fibres embedded in a continuum is a computationally demanding process. In this contribution, we propose an approach based on the partition of unity property of finite element shape functions that can handle discrete thin fibres in a continuum matrix without meshing them. This is made possible by a special enrichment function that represents the action of each individual fibre on the matrix. Our approach allows to model fibre‐reinforced materials considering matrix, fibres and interfaces between matrix and fibres individually, each with its own elastic constitutive law.
1.
F., Radtke F. K., A., Simone, J., Sluys L.
A computational model for failure analysis of fibre reinforced concrete with discrete treatment of fibres Journal Article
In: ENGINEERING FRACTURE MECHANICS, vol. 77, no. 4, pp. 597–620, 2010.
Abstract | BibTeX | Tags: Damage, Failure analysis, Fibre reinforced concrete, Finite element method | Links:
@article{F.K.F.2010a,
title = {A computational model for failure analysis of fibre reinforced concrete with discrete treatment of fibres},
author = {Radtke F. K. F. and Simone A. and Sluys L. J.},
doi = {10.1016/j.engfracmech.2009.11.014},
year = {2010},
date = {2010-01-01},
journal = {ENGINEERING FRACTURE MECHANICS},
volume = {77},
number = {4},
pages = {597–620},
abstract = {Failure patterns and mechanical behaviour of high-performance fibre reinforced cementitious composites depend on the distribution of fibres within a specimen. In this contribution, we propose a novel computational approach to describe failure processes in fibre reinforced concrete. A discrete treatment of fibres enables us to study the influence of various fibre distributions on the mechanical properties of the material. To ensure numerical efficiency, fibres are not explicitly discretized but they are modelled by applying discrete forces to a background mesh. The background mesh represents the matrix while the discrete forces represent the interaction between fibres and matrix. These forces are assumed to be equal to fibre pull-out forces. With this approach experimental data or micro mechanical models, including detailed information about the fibre–matrix interface, can be directly incorporated into the model.},
keywords = {Damage, Failure analysis, Fibre reinforced concrete, Finite element method},
pubstate = {published},
tppubtype = {article}
}
Failure patterns and mechanical behaviour of high-performance fibre reinforced cementitious composites depend on the distribution of fibres within a specimen. In this contribution, we propose a novel computational approach to describe failure processes in fibre reinforced concrete. A discrete treatment of fibres enables us to study the influence of various fibre distributions on the mechanical properties of the material. To ensure numerical efficiency, fibres are not explicitly discretized but they are modelled by applying discrete forces to a background mesh. The background mesh represents the matrix while the discrete forces represent the interaction between fibres and matrix. These forces are assumed to be equal to fibre pull-out forces. With this approach experimental data or micro mechanical models, including detailed information about the fibre–matrix interface, can be directly incorporated into the model.
