Development and application of a new discrete element into simulation of nonlinear behavior of concrete

Mehrpay, Saeid; Wang, Zhao; Ueda, Tamon

doi:10.1002/suco.201900059

Cited by 8 publications

(3 citation statements)

References 28 publications

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“…In this paper, the DIP technology is based on BFEM for modeling and calculation. At present, the relatively mature methods include the FEM 42,43 and the discrete element method (DEM) 44,45 . The FEM was first established by Wittmann to simulate the complex mechanical behavior of concrete 46 .…”

Section: Numerical Simulation For Real Aggregate Modelmentioning

confidence: 99%

Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

Peng

Kamel

Wang

2020

Structural Concrete

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Since recycled aggregate concrete (RAC) is valuable for green concrete and global sustainability, it has attracted many numerical research studies as a five‐phase material in mesolevel. In this study, the digital image processing (DIP) technique is used to obtain the real aggregate and mortar distribution of recycled concrete specimens. By applying the DIP MATLAB model, the real mesoheterogeneity of RAC is well represented. Based on the base force element method (BFEM), a mesomechanical model is constructed to simulate the uniaxial tension and compression tests of recycled concrete specimens subjected to displacement loads. The damage and the cracking mechanisms of RAC are analyzed in the mesolevel. Moreover, the failure process and the failure mode are investigated. Results indicate the nonlinearity deformation, stress redistribution, and cracks propagation of RAC. The stress–strain curve, fracture energy, and fracture distribution are also figured. The comparative analysis between the simulation and the experimental results of in situ RAC samples shows the applicability of the model; therefore, the failure mechanism is revealed. It also extends the application of the BFEM in the field of failure mechanism analysis of RAC as a heterogeneous composite material.

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Section: Numerical Simulation For Real Aggregate Modelmentioning

confidence: 99%

Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

Peng

Kamel

Wang

2020

Structural Concrete

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“…There are many mechanical interactions between cracks and particles [5,6]. The discrete element method is widely used in geotechnical, geological, and hydraulic fields [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Simultaneous Effects of Particle Size and Porosity in Simulating Geo-Materials

Sun

Huang

2022

Materials

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The particle discrete element method (PDEM) is widely used to simulate rock and soil materials to obtain stress and strain. However, there are three shortcomings: (1) Single sphere or ellipsoids directly replace the soil particles; (2) it treats the diameters of spheres or ellipsoids as the soil particle size; (3) the overlapping particle volume is not deducted in calculating the porosity. Hence, it is difficult for the simulation of the geological body to agree with reality. This research found a rotation calculation model and a pixel counting method to make joint soil particles more accurately simulate geological materials to solve the three shortcomings. The model successfully obtained the gradation curve and porosity of the simulated geological body with joint particles. This research will further enrich and broaden the application prospects of PDEM and provide a reference for scientific research and engineering fields in geological engineering, geotechnical engineering, and petroleum engineering.

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“…Several numerical methods (e.g., bond-based peridynamics (Silling and Askari, 2005), lattice models or discrete approaches (Bolander and Saito, 1998;Nikoli c et al, 2018)) have effective features for the fracture analyses of the quasi-brittle materials. However, due to the intrinsic limitations for simulating the volumetric behaviors in the wide ranges of Poisson's ratio , additional approaches to remedy the Poisson effect have been developed (Asahina et al, 2015(Asahina et al, , 2017Liu and Hong, 2012;Mehrpay et al, 2020). Basically, the finite element solutions can reflect the Poisson effects of the various materials including the rubber-like materials ( % 0:5).…”

Section: Introductionmentioning

confidence: 99%

Fracture simulations using edge-based smoothed finite element method for isotropic damage model via Delaunay/Voronoi dual tessellations

Hwang

Jin

Hong

2021

International Journal of Damage Mechanics

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In this study, an effective numerical framework for fracture simulations is proposed using the edge-based smoothed finite element method (ES-FEM) and isotropic damage model. The duality between the Delaunay triangulation and Voronoi tessellation is utilized for the mesh construction and the compatible use of the finite element solution with the Voronoi-cell lattice geometry. The mesh irregularity is introduced to avoid calculating the biased crack path by adding random variation in the nodal coordinates, and the ES-FEM elements are defined along the Delaunay edges. With the Voronoi tessellation, each nodal mass is calculated and the fractured surfaces are visualized along the Voronoi edges. The rotational degrees of freedom are implemented for each node by introducing the elemental formulation of the Voronoi-cell lattice model, and the accurate visualizations of the rotational motions in the Voronoi diagram are achieved. An isotropic damage model is newly incorporated into the ES-FEM formulation, and the equivalent elemental length is introduced with an additional geometric factor to simulate the consistent softening behaviors with reducing the mesh sensitivity. The full matrix form of the smoothed strain-displacement matrix is constructed for optimal use in the element-wise computations during explicit time integration, and parallel computing is implemented for the enhancement of the computational efficiency. The simulated results are compared with the theoretical solutions or experimental results, which demonstrates the effectiveness of the proposed methodology in the simulations of the quasi-brittle fractures.

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Development and application of a new discrete element into simulation of nonlinear behavior of concrete

Cited by 8 publications

References 28 publications

Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

Modeling the Simultaneous Effects of Particle Size and Porosity in Simulating Geo-Materials

Fracture simulations using edge-based smoothed finite element method for isotropic damage model via Delaunay/Voronoi dual tessellations

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