Thuy Nguyen est Enseignante - Chercheuse en Mécanique et Matériaux à l'ESILV. Elle est également chercheuse associée au SPEC du CEA Saclay. Ses formations universitaires comportent principalement un Magistère PHYTEM (PHYsique, Théorie, Experience, Modèle) à l'ENS Cachan et un Master 2 spécialité «Optique et Photonique» à l'Institut d'Optique de l'université Paris-Saclay. Elle a ensuite obtenu un Doctorat en physique de l'université Paris-Saclay à l'issue d'une thèse préparée au sein du laboratoire SPCSI du CEA-Saclay. Ses domaines d'expertise sont la physique de la rupture fragile, les matériaux innovants (métamatériaux architecturés et bio-inspirés, matériaux intelligents, matériaux fonctionnels, ...) et la morphologie de surface à l'échelle nanométrique.
Antoine Montiel; Thuy Nguyen; Cindy Rountree; Valérie Geertsen; Patrick Guenoun; Daniel Bonamy
Effect of architecture disorder on the elastic response of two-dimensional lattice materials Journal Article
In: Physical Review E, vol. 106, no. 1, pp. 015004, 2022.
@article{montiel_1922,
title = {Effect of architecture disorder on the elastic response of two-dimensional lattice materials},
author = {Antoine Montiel and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://journals.aps.org/pre/abstract/10.1103/PhysRevE.106.015004?ft=1},
year = {2022},
date = {2022-07-01},
journal = {Physical Review E},
volume = {106},
number = {1},
pages = {015004},
abstract = {We examine how disordering joint position influences the linear elastic behavior of lattice materials via numerical simulations in two-dimensional beam networks. Three distinct initial crystalline geometries are selected as representative of mechanically isotropic materials with low connectivity, mechanically isotropic materials with high connectivity, and mechanically anisotropic materials with intermediate connectivity. Introducing disorder generates spatial fluctuations in the elasticity tensor at the local (joint) scale. Proper coarse-graining reveals a well-defined continuum-level scale elasticity tensor. Increasing disorder aids in making initially anisotropic materials more isotropic. The disorder impact on the material stiffness depends on the lattice connectivity: Increasing the disorder softens lattices with high connectivity and stiffens those with low connectivity, without modifying the scaling between elastic modulus and density (linear scaling for high connectivity and cubic scaling for low connectivity). Introducing disorder in lattices with intermediate fixed connectivity reveals both scaling: the linear scaling occurs for low density, the cubic one at high density, and the crossover density increases with disorder. Contrary to classical formulations, this work demonstrates that connectivity is not the sole parameter governing elastic modulus scaling. It offers a promising route to access novel mechanical properties in lattice materials via disordering the architectures.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Thuy Nguyen; Daniel Bonamy
Role of the Crystal Lattice Structure in Predicting Fracture Toughness Journal Article
In: Physical Review Letters, vol. 123, no. 20, pp. 205503, 2019.
@article{nguyen_1496,
title = {Role of the Crystal Lattice Structure in Predicting Fracture Toughness},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.205503},
year = {2019},
date = {2019-11-01},
journal = {Physical Review Letters},
volume = {123},
number = {20},
pages = {205503},
abstract = {We examine the atomistic scale dependence of a material's resistance to failure by numerical simulations and analytical analysis in electrical analogs of brittle crystals. We show that fracture toughness depends on the lattice geometry in a way incompatible with Griffith's relationship between fracture and free surface energy. Its value finds its origin in the matching between the continuum displacement field at the engineering scale, and the discrete nature of solids at the atomic scale. The generic asymptotic form taken by this field near the crack tip provides a solution for this matching, and subsequently a way to predict toughness from the atomistic parameters with application to graphene},
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pubstate = {published},
tppubtype = {article}
}
Thuy Nguyen
Mechanical behaviour of bio-inspired beam lattice metamaterials Conference
Colloque national annuel MecaMat, Aussois, France, 2023.
@conference{nguyen_2184,
title = {Mechanical behaviour of bio-inspired beam lattice metamaterials},
author = {Thuy Nguyen},
editor = {MecaMat},
url = {https://aussois2023.sciencesconf.org/},
year = {2023},
date = {2023-01-01},
booktitle = {Colloque national annuel MecaMat},
address = {Aussois, France},
keywords = {},
pubstate = {published},
tppubtype = {conference}
}
Thuy Nguyen; Daniel Bonamy
Effect of atomic-scale solid discreetness in brittle fracture problem Conference
11th European Solid Mechanics Conference, Galway, Ireland, 2022.
@conference{nguyen_1923,
title = {Effect of atomic-scale solid discreetness in brittle fracture problem},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.esmc2022.org/},
year = {2022},
date = {2022-07-01},
booktitle = {11th European Solid Mechanics Conference},
address = {Galway, Ireland},
abstract = {Material's resistance-to-failure is quantified by two dependent material constants (one is proportional to the square of the other): fracture energy and fracture toughness. Predicting their values from the solid structure at the atomistic scale remains insolved, even in the simplest situation of an ideal brittle fracture. By examining numerically crack growth in electrical analogues of brittle crystals with modulated geometries, we shed a new light on this question. We find that the value of fracture energy cannot be deduced from Griffith's free surface energy, as is generally believed [1]. Rather, it finds its origin in the matching between the continuum-level scale displacement field of solid mechanics and the discrete nature of solids at the atomic scale. By making use of the generic asymptotic form, referred to as Williams's series expansion [2], taken by the displacement field near the crack tip, we find an analytical solution for this matching, and subsequently a way to predict quantitativly fracture toughness from the atomistic parameters [3]. We will discuss how to extend the analysis to genuine elastic (plane stress) crack problems and predict fracture toughness in 2D and 3D materials. This work sheds new perspectives on how resistance-to-faillure is selected; and hence, how it can be improved. As such, it may catalyze novel research toward new architectured materials of superior strcutural performance via microstructure patterning : tougher, more durable, lighter and/or combining other functionalities.},
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pubstate = {published},
tppubtype = {conference}
}
Antoine Montiel; Paul Sargueil; Thuy Nguyen; Cindy Rountree; Valérie Geertsen; Patrick Guenoun; Daniel Bonamy
Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture Conference
Mécanique des Matériaux Architecturés, MacaMat Aussois, France, 2022.
@conference{montiel_1775,
title = {Mechanical & fracture behaviour of microlattice metamaterial with disordered architecture},
author = {Antoine Montiel and Paul Sargueil and Thuy Nguyen and Cindy Rountree and Valérie Geertsen and Patrick Guenoun and Daniel Bonamy},
url = {https://aussois2022.sciencesconf.org/},
year = {2022},
date = {2022-01-01},
booktitle = {Mécanique des Matériaux Architecturés},
address = {Aussois, France},
organization = {MacaMat},
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pubstate = {published},
tppubtype = {conference}
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Thuy Nguyen; Daniel Bonamy
Lattice trapping and fracture toughness selection in britttle crystals Inproceedings
In: 25th International Congress of Theoretical and Applied Mechanics, Milano, Italy, 2021.
@inproceedings{nguyen_1272,
title = {Lattice trapping and fracture toughness selection in britttle crystals},
author = {Thuy Nguyen and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milano, Italy},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Antoine Montiel; Thuy Nguyen; M Perchelet; Valérie Geertsen; Cindy Rountree; Patrick Guenoun; Daniel Bonamy
Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture Inproceedings
In: 25th International Congress of Theoretical and Applied Mechanics, Milan, Italy, 2021.
@inproceedings{montiel_1498,
title = {Mechanical and fracture behaviour of microlattice-based metamaterial with disordered architecture},
author = {Antoine Montiel and Thuy Nguyen and M Perchelet and Valérie Geertsen and Cindy Rountree and Patrick Guenoun and Daniel Bonamy},
url = {https://www.ictam2020.org/},
year = {2021},
date = {2021-08-01},
booktitle = {25th International Congress of Theoretical and Applied Mechanics},
address = {Milan, Italy},
abstract = {Microlattice based metamaterials made of periodically arranged hollow microtubes appear as highly promising materials; they
both combine ultra-low density and sufficient stiffness and mechanical strength to envisage their use as structure material, in the aeronautical
industry for instance. Still, until now, most studies have considered periodically ordered architectures. Here, we explored amorphous
architectures and analysed how the disorder amount plays on the mechanical and failure properties. The presented study relies on both
numerical simulations using Timoshenko beam model and experiments performed on 3D-printed samples, the architecture of which mimics
that of the simulated samples},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Daniel Bonamy; Thuy Nguyen
Breaking news : les solides fragiles le sont moins que prévu ! Miscellaneous
CEA, 2019.
@misc{bonamy_1497,
title = {Breaking news : les solides fragiles le sont moins que prévu !},
author = {Daniel Bonamy and Thuy Nguyen},
url = {http://iramis.cea.fr/spec/Phocea/Vie_des_labos/Ast/ast.php?t=fait_marquant&id_ast=3180},
year = {2019},
date = {2019-12-01},
howpublished = {CEA},
keywords = {},
pubstate = {published},
tppubtype = {misc}
}
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