3D numerical modelling of solid particles with randomness in shape considering convexity and concavity

Peng, Yan; Zhang, Jinhua; Fang, Qin; Zhang, Yadong; Fan, Junyu

doi:10.1016/j.powtec.2016.06.007

Cited by 36 publications

(6 citation statements)

References 40 publications

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“…Recently, microscale realistic image-based finite element (FE) models [1,12,13] have been proposed and received extensive attention. In comparison with numerical models using idealised microscale morphologies [14][15][16] or assumed stochastically random field properties [17], the image-based models faithfully reproduce the intrinsic heterogeneity of the material, such as shape, size, and distribution of inclusions and pores [18]. Moreover, the simulated results at different loading steps can be quantitatively validated by in situ experimental images (e.g., XCT) [9,19].…”

Section: Introductionmentioning

confidence: 79%

Three‐Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete

et al. 2018

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Three-dimensional (3D) characterisation and modelling of cracking in concrete have been always of great importance and interest in civil engineering. In this study, an in situ microscale X-ray computed tomography (XCT) test was carried out to characterise the 3D microscale structure and cracking behaviour under progressive uniaxial compressive loading. The 3D cracking and fracture behaviour including internal crack opening, closing, and bridging were observed through both 2D tomography slices and 3D CT images. Spatial distributions of voids and cracks were obtained to understand the overall cracking process within the specimen. Furthermore, the XCT images of the original configuration of the specimen were processed and used to build microscale realistic 3D finite element (FE) models. Cohesive interface elements were inserted into the FE mesh to capture complicated discrete crack initiation and propagation. An FE simulation of uniaxial compression was conducted and validated by the in situ XCT compression test results, followed by a tension simulation using the same image-based model to investigate the cracking behaviour. The quantitative agreement between the FE simulation and experiment demonstrates that it is a very promising and effective technique to investigate the internal damage and fracture behaviour in multiphasic composites by combining the in situ micro XCT experiment and image-based FE modelling.

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Section: Introductionmentioning

confidence: 79%

Three‐Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete

et al. 2018

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“…The height of the transverse ribs is h=0.07d, the rib angle α=45°, the rib spacing lr=0.6d, and the steel inner diameter d0=0.96d (d is the nominal diameter of the steel bar). The concrete is regarded as a composite composed of three phases consisting of aggregate, mortar matrix, and an interfacial transition zone (ITZs) [17][18]. The aggregate particles are assumed to be round with a volume fraction of 35%.…”

Section: D Meso -Scale Numerical Model For Reinforced Concrete 21 Meso-scale Computational Geometry Modelmentioning

confidence: 99%

Mesoscale modelling of bond failure behaviour of ribbed steel bar and concrete interface

et al. 2021

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To explore the nonlinear bond behaviour between ribbed bar and concrete, combined with the characteristics of concrete meso-structure and ribbed bar surface characteristics and considering frictional resistance and the mechanical interlocking between rebar and concrete, a meso-scale model is established. Based on the good agreement between the simulation results and experimental results, the failure mechanism of bond between rebar and concrete is discussed, and the distribution characteristics of bond stress of steel bar are analysed. Furthermore, based on the meso numerical analysis method, the influence of friction coefficient between rebar and concrete on the failure mode of concrete and bond stress-slip curve was discussed, and the proportion of friction component in bond strength is obtained.

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“…The previous studies have shown that the shape of these particles plays a key role in the physical properties like mechanical performance, workability and durability of the composites [5]. Besides, composites have multiscale characteristics due to different sizes of particles varying from micro/sub-micro to macro scale [6]. To evaluate these mesoscopic properties, a mesostructure model as a crucial part of an analysis is required to represent both realistic shape and size of particles.…”

Section: Introductionmentioning

confidence: 99%

“…The accuracy of a model is related to the shape description level. The available methodologies similarly describe the particle with the following shape parameters in three levels [6,[26][27][28][29][30]:…”

Section: Introductionmentioning

confidence: 99%

“…Roundness or angularity: referring to surface features, some particles can be described as sharp, angular and round. For the particles like aggregates, gravel and crushing stones, the angularity is an important characteristic that significantly influences the strength, friction angle and stability of the material [6]. Studies revealed the importance of local properties of shape (e.g.…”

Section: Introductionmentioning

confidence: 99%

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An integrated framework for modelling virtual 3D irregulate particulate mesostructure

Naderi

Zhang

2019

Powder Technology

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Many particulate composites show heterogenous mesoscopic structural behaviour due to a random distribution of irregular shaped particles with different sizes ranging from micro to macro scale. Accurate mesoscale models are required to represent actual geometric properties of such a composite with realistic features. In this paper, a cost-effective simulation framework is presented, which can virtually generate three-dimensional mesostructure models composed of irregulate particles with real characteristics. A MATLAB code is developed based on the Voronoi tessellation method and the splining technique. The hybrid Voronoi-spline algorithm can be programmed to control the shape and size of particles based on the experimental data. The examples demonstrated the proper adjustability of the models in accordance with the sieve analysis and shape parameters such as sphericity and roundness. The generated model as a triangulated geometry surface can be directly exported into computational analysis of materials, which uses other numerical techniques including finite element method.

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3D numerical modelling of solid particles with randomness in shape considering convexity and concavity

Cited by 36 publications

References 40 publications

Three‐Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete

Three‐Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete

Mesoscale modelling of bond failure behaviour of ribbed steel bar and concrete interface

An integrated framework for modelling virtual 3D irregulate particulate mesostructure

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