A quadtree-polygon-based scaled boundary finite element method for image-based mesoscale fracture modelling in concrete

Guo, Haoxu; Ooi, Ean Tat; Saputra, Albert A.; Yang, Zhenjun; Natarajan, Sundararajan; Ooi, Ean Hin; Song, Chongmin

doi:10.1016/j.engfracmech.2019.02.021

Cited by 60 publications

(14 citation statements)

References 52 publications

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“…The concrete can be regarded as a two-phase composite structure composed of the aggregate and the mortar matrix. The modelling method of meso-scale can well simulate and predict the cracking behaviour of concrete [14]. Now, there are two main numerical methods to create the meso-scale model.…”

Section: State Of the Artmentioning

confidence: 99%

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Wang¹,

Zhao²,

Wu³

et al. 2021

Int. j. simul. model.

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To reveal the damage evolution and energy dissipation characteristics of lightweight aggregate concrete (LWAC) under impact loading, some simulations of lightweight shale ceramsite concrete under high strain rate impact with a 3D meso-scale model were carried out. After the meso-scale model considering the randomness of the shape and distribution of lightweight aggregates being established and the material parameters of each component being determined by test results, the damage evolution and energy dissipation characteristics of the model under different strain rates were analysed. Results show that the damage evolution of LWAC can be divided into four stages from the perspective of energy. The large deformation and stress concentration firstly occur on the lightweight aggregates, which leads to the generation of micro-cracks. There is an upper limit of the strain energy density of the lightweight aggregate component. The energy absorption efficiency of the specimen first increases and then decreases with the increase of strain rates. The obtained conclusions can provide a reference for understanding the dynamic performances and damage mechanism of LWAC.

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Section: State Of the Artmentioning

confidence: 99%

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Wang¹,

Zhao²,

Wu³

et al. 2021

Int. j. simul. model.

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“…Figure 8 is to demonstrate the capability of the quadtree decomposition for a domain with complex boundaries. The curved boundaries are approximately represented by locally refined mesh, but zigzag-shaped boundaries still exist and can be handled by mesh trimming (Guo et al, 2019), but for nonlocal damage analysis, such a treatment is not necessary, because the nonlocal model can smooth the strain discontinuity through integrating within a specific region.…”

Section: Imaged-based Quadtree Decompositionmentioning

confidence: 99%

“…Combining these advantages, we have successfully modelled the progressive damage of concrete by the SBFEM at macroscale in 2 D (Zhang et al, 2019) and 3 D . More recently, the SBFEM also has been successfully applied to mesoscale fracture modelling with zero-thickness cohesive element (Guo et al, 2019;Huang et al, 2016). Since the cohesive elements are pre-inserted into the interface between adjacent cells, sufficiently small cells are required to trace the crack path accurately.…”

Section: Introductionmentioning

confidence: 99%

Mesoscale damage modelling of concrete by using image-based scaled boundary finite element method

Zhang

Guo

Zhang

et al. 2021

International Journal of Damage Mechanics

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As a thin layer surrounding aggregates, the interfacial transition zone (ITZ) has a significant influence on the mechanical performance of concrete, a large number of small elements is required to discretize the ITZ and its vicinity owing to its small thickness. In this contribution, the mesostructure of concrete is explicitly built by a novel method named improved random walking algorithm (IRWA), with which the grading, content, shape of aggregates and the thickness of ITZs, can be conveniently controlled by users, and high volume fraction of aggregate and remarkable efficiency can be achieved. In the framework of the scaled boundary finite element method (SBFEM), the image-based quadtree decomposition is employed to automatically generate the multi-level mesh for the concrete composites, with no trouble in dealing with hanging nodes or the dramatically changing element size in the vicinity of the material interface. The nonlocal damage model in integral format is extended to simulate progressive damage of concrete at mesoscale with good mesh independence. Four benchmarks are modelled to demonstrate the performance of the proposed approach, and the effects of model parameters on the structural responses are also discussed.

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“…To elaborate the microstructures of these materials, many researchers develop reconstruction methods to generate finite element (FE) meshes from digital images. [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Mainly, these reconstruction methods can be classified into two categories [18]: based on geometry and pixel method.…”

Section: Introductionmentioning

confidence: 99%

“…In the pixel/voxel-based method [11,[14][15][16], elements are generated directly and automatically by mapping pixels/voxels in the digital image [19,20]. The material regions selected for analyzing are determined based on the gray level of corresponding pixel/voxel.…”

Section: Introductionmentioning

confidence: 99%

An Image-Based Double-Smoothing Cohesive Finite Element Framework for Particle-Reinforced Materials

Bai

Xie

et al. 2020

Mathematics

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In order to simulate the fracture process of particle-reinforced materials on the micro-scale, an image-based double-smoothing cohesive finite element framework is proposed in the present paper. Two separate smoothing processes are performed to reduce the noise in the digital image and eliminate the jagged elements in the finite element mesh. The main contribution of the present study is the proposed novel image-based cohesive finite element framework, and this method improved the quality of the meshes effectively. Meanwhile, the artificial resistance due to the jagged element is reduced with the double-smoothing cohesive finite element framework during the crack propagation. Therefore, the image-based double-smoothing cohesive finite element framework is significant for the simulation of fracture mechanics.

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A quadtree-polygon-based scaled boundary finite element method for image-based mesoscale fracture modelling in concrete

Abstract: A quadtree-polygon-based scaled boundary finite element method for image-based mesoscale fracture modelling in concrete. Engineering Fracture Mechanics, 211,

Cited by 60 publications

References 52 publications

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Meso-Scale Simulations of Lightweight Aggregate Concrete under Impact Loading

Mesoscale damage modelling of concrete by using image-based scaled boundary finite element method

An Image-Based Double-Smoothing Cohesive Finite Element Framework for Particle-Reinforced Materials

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