References of "Nguyen, Thanh Tung 50025791"
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See detailComputational chemo-thermo-mechanical coupling phase-field model for complex fracture induced by early-age shrinkage and hydration heat in cement-based materials
Nguyen, Thanh Tung UL; Waldmann, Danièle UL; Bui, T. Q.

in Computer Methods in Applied Mechanics and Engineering (2019), 348

In this paper, we present a new multi-physics computational framework that enables us to capture and investigate complex fracture behavior in cement-based materials at early-age. The present model ... [more ▼]

In this paper, we present a new multi-physics computational framework that enables us to capture and investigate complex fracture behavior in cement-based materials at early-age. The present model consists of coupling the most important chemo-thermo-mechanical processes to describe temperature evolution, variation of hydration degree, and mechanical behavior. The changes of material properties are expressed as a function of the hydration degree, to capture the age effects. Fracture analysis of these processes are then accommodated by a versatile phase field model in the framework of smeared crack models, addressing the influence of cracks on hydration and thermal transfer. We additionally describe a stable and robust numerical algorithm, which aims to solve coupled problems by using a staggered scheme. The developed approach is applied to study the fracture phenomena at both macroscopic and mesoscopic scales, in which all microstructural heterogeneities of sand and cement matrix are explicitly accounted. Nucleation, initiation, and propagation of complex crack network are simulated in an efficient way demonstrating the potential of the proposed approach to assess the early-age defects in concrete structures and materials. [less ▲]

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See detailShape optimization of structures with cutouts by an efficient approach based on XIGA and chaotic particle swarm optimization
Wang, Chao; Yu, Tiantang; Shao, Guojian et al

in European Journal of Mechanics. A, Solids (2019), 74

Structural shape optimization is one important and crucial step in the design and analysis of many engineering applications as it aims to improve structural characteristics, i.e., reducing stress ... [more ▼]

Structural shape optimization is one important and crucial step in the design and analysis of many engineering applications as it aims to improve structural characteristics, i.e., reducing stress concentration and structural weight, or improving the stiffness, by changing the structural boundary geometries. The goal of this paper is to present an efficient approach, which goes beyond limitations of conventional methods, by combining extended isogeometric analysis (XIGA) and chaotic particle swarm optimization algorithm for shape optimization of structures with cutouts. In this setting, mechanical response of structures with cutouts is derived by the non-uniform rational B-spline (NURBS) and enrichment techniques. The computational mesh is hence independent of the cutout geometry, irrelevant to the cutout shape during the optimization process, representing one of the key features of the present work over classical methods. The control points describing the boundary geometries are defined as design variables in this study. The design model, analysis model, and optimization model are uniformly described with the NURBS, providing easy communication among the three aforementioned models, resulting in a smooth optimized boundary. The chaotic particle swarm optimization (CPSO) algorithm is employed for conducting the optimization analysis. Apart from that, the CPSO has some advantages as it includes: (i) its structure is simple and easy to implement; (ii) without the need for the complicated sensitivity analysis as compared with the traditional gradient-based optimization methods; and (iii) effectively escaping from the local optimum. The accuracy and performance of the developed method are underlined by means of several representative 2-D shape optimization examples. [less ▲]

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See detailPhase field modeling of crack initiation and propagation under complex loading
Nguyen, Thanh Tung UL; Yvonnet, Julien; Waldmann, Danièle UL

in International Conference on Computational Modeling of Fracture and Failure of Materials and Structures (2019)

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See detailExperimental and numerical analysis of early age behavior in non-reinforced concrete
Nguyen, Thanh Tung UL; Weiler, Michael UL; Waldmann, Danièle UL

in Construction and Building Materials (2019), 210

An approach combining numerical simulations and experimental techniques is proposed to investigate the early-age properties of non-reinforced concrete. Both thermo-mechanical and fracture behaviors are ... [more ▼]

An approach combining numerical simulations and experimental techniques is proposed to investigate the early-age properties of non-reinforced concrete. Both thermo-mechanical and fracture behaviors are studied, providing a deep insight into the hydration process. This work makes an important step in understanding the effects of hydration on the performance of cement-based materials. More specifically, in the first part, the shrinkage and fracture properties of a non-reinforced concrete have been experimentally considered, along with the characterization of several material parameters. The experimental results exhibit a high risk of early-age cracking for this kind of concrete. Especially, the fracture phenomena are complex, including multi-evolution-stages, initiation, propagation, stop-growing, and re-growing. In the second part, the computational modeling based on the phase field method of failure mechanism is applied to simulate the thermal, mechanical and fracture behavior due to early-age hydration. A detailed discussion on the identification of model/material parameters and the construction of numerical model including the boundary conditions is given. We provide the following comparison between predictions of the numerical simulation with the experimental observations. An excellent predictive capability of the computational model is noted. More importantly, this work demonstrates the performance of the proposed approach, which requires only a few tests to identify the model inputs. Most of the chemo-thermal parameters can be theoretically determined based on the concrete mix and the chemical/mineral compositions of the cement. [less ▲]

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See detailFracture modeling with the adaptive XIGA based on locally refined B-splines
Gu, Jiming; Yu, Tiantang; Le, Van Lich et al

in Computer Methods in Applied Mechanics and Engineering (2019), 354

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See detailPhase field modeling of interfacial damage in heterogeneous media with stiff and soft interphases
Nguyen, Thanh Tung UL; Yvonnet, Julien; Waldmann, Danièle UL et al

in Engineering Fracture Mechanics (2019), 218

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See detailRole of interfacial transition zone in phase field modeling of fracture in layered heterogeneous structures
Nguyen, Thanh Tung UL; Waldmann, Danièle UL; Bui, T. Q.

in Journal of Computational Physics (2019), 386

Mechanical behavior of layered materials and structures greatly depends on the mechanical behavior of interfaces. In the past decades, the failure in such layered media has been studied by many ... [more ▼]

Mechanical behavior of layered materials and structures greatly depends on the mechanical behavior of interfaces. In the past decades, the failure in such layered media has been studied by many researchers due to their critical role in the mechanics and physics of solids. This study aims at investigating crack-interface interaction in two-dimensional (2-D) and three-dimensional (3-D) layered media by a phase field model. Our objectives are fourfold: (a) to better understand fracture behavior in layered heterogeneous systems under quasi-static load; (b) to introduce a new methodology for better describing interfaces by a regularized interfacial transition zone in the context of varia-tional phase field approach, exploring its important role; (c) to show the accuracy , performance and applicability of the present model in modeling material failure at the interfaces in both 2-D and 3-D bodies; and (d) to quantitatively validate computed crack path with respect to experimental data. Phase field models with both perfectly and cohesive bonded interfaces are thus derived. A regularized interfacial transition zone is introduced to capture characteristics of material mismatch at the interfaces. Numerical examples for 2-D and 3-D layered systems with experimental validation provide fundamentals of fracture behavior in layered structures. The obtained results shed light on the behavior of crack paths, which are drastically affected by the elastic modulus mismatch between two layers and interface types, and reveal the important role of the proposed interfacial transition zone in phase field modeling of crack interface interactions. [less ▲]

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See detailPhase field modeling of interfacial crack propagation in quasi-brittle heterogeneous materials
Nguyen, Thanh Tung UL; Yvonnet, Julien; Waldmann, Danièle UL et al

in International Conference on Computational Modeling of Fracture and Failure of Materials and Structures (2019)

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See detailMultiple Cracks Interactions in Stress Corrosion Cracking: In Situ Observation by Digital Image Correlation and Phase Field Modeling
Bolivar, J.; Nguyen, Thanh Tung UL; Shi, Y. et al

in Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (2018)

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See detailStructural shape optimization by IGABEM and particle swarm optimization algorithm
Sun, S. H.; Yu, T. T.; Nguyen, Thanh Tung UL et al

in Engineering Analysis with Boundary Elements (2018), 88

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See detailPhase field simulation of early-age fracture in cement-based materials
Nguyen, Thanh Tung UL; Waldmann, Danièle UL; Bui, T. Q.

E-print/Working paper (2018)

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See detailModeling of Complex Microcracking in Quasi-Brittle Materials: Numerical Methods and Experimental Validations
Nguyen, Thanh Tung UL; Yvonnet, J.; Bornert, M. et al

in Advances in Multi-Physics and Multi-Scale Couplings in Geo-Environmental Mechanics (2018)

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See detailA Phase field method for modeling anodic dissolution induced stress corrosion crack propagation
Nguyen, Thanh Tung UL; Bolivar, J.; Shi, Y. et al

in Corrosion Science (2018), 132

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See detailModelling of early-age complex crack propagation in cement-based materials using phase field method
Nguyen, Thanh Tung UL; Waldmann, Danièle UL

in 6th European Conference on Computational Mechanics (2018)

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See detailDVC‐based image subtraction to detect microcracking in lightweight concrete
Chateau, C.; Nguyen, Thanh Tung UL; Bornert, M. et al

in Strain (2018), 54

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See detailModelling of inter- and transgranular stress corrosion crack propagation in polycrystalline material by using phase field method
Nguyen, Thanh Tung UL; Réthoré, J.; Bolivar, J. et al

in Journal of the Mechanical Behavior of Materials (2018), 26

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See detailMulti-inclusions modeling by adaptive XIGA based on LR B-splines and multiple level sets
Gu, J.; Yu, T. T.; Le, V. L. et al

in Finite Elements in Analysis and Design (2018), 148

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See detailAdaptive multi-patch isogeometric analysis based on locally refined B-splines
Gu, J.; Yu, T. T.; Le, V. L. et al

in Computer Methods in Applied Mechanics and Engineering (2018), 339

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See detailA Phase field method for modeling stress corrosion crack propagation in a nickel base alloy
Nguyen, Thanh Tung UL; Bolivar, J.; Réthoré, J. et al

in International Journal of Solids and Structures (2017), 112

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See detailPhase field modelling of anisotropic crack propagation
Nguyen, Thanh Tung UL; Réthoré, J.; Baietto, M.-C.

in European Journal of Mechanics. A, Solids (2017), 65

Detailed reference viewed: 52 (4 UL)