In-situ X-ray computed tomography characterisation of 3D fracture evolution and image-based numerical homogenisation of concrete

Yang, Zhenjun; Ren, Wenyuan; Sharma, Rajneesh; McDonald, S.A.; Mostafavi, Mahmoud; Vertyagina, Yelena; Marrow, James

doi:10.1016/j.cemconcomp.2016.10.001

Cited by 170 publications

(50 citation statements)

References 35 publications

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“…At the peak load 9.1 kN, the major vertical cracks propagated (see Figure 3(b)), leading to significant dilation of the whole specimen. A similar trend was obtained for a 40 mm specimen, as reported in [19].…”

Section: Resultssupporting

confidence: 74%

“…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%

“…According to Yuan and Harrison [25] and Erdem et al [26], such initial defects and heterogeneous microstructure would significantly intensify the transverse tensile strains during compression and stress concentration around the pores. Accordingly, they 6 Complexity represent weak regions for failure, accelerate crack propagation, and lead to final failure of the concrete specimen [19]. Recalling the evolution of the content of voids and cracks during the compression (see Figure 4), it is shown that the total volume of voids and cracks is firstly reduced with the load increasing from 0 kN to 0.8 kN (see Figure 7(a)).…”

Section: Subvolume Microcrackingmentioning

confidence: 99%

“…As an extension to the authors' previous in situ XCT tests [19], this follow-up study used the simpler uniaxial compression loading condition rather than the Brazilianlike concentrated splitting, and the size of the concrete cube was halved to obtain imaging results of 3D microscale structure and cracking process with higher voxel resolution. Nonlinear FE simulations based on the realistic microstructure were then performed and validated by the in situ test results.…”

Section: Introductionmentioning

confidence: 99%

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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: Resultssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 79%

Section: Subvolume Microcrackingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…The gray level residuals were also used to detect matrix/nodule debonding in cast iron [93,219,29]. Maximum eigen strain fields enabled multiple microcracking to be quantified in brittle materials [101,231,94,240] and damage in SiC/SiC composites [201]. Other strain descriptors such as the first and second invariants were used to detect cracks [38].…”

Section: Introductionmentioning

confidence: 99%

Digital Volume Correlation: Review of Progress and Challenges

et al. 2018

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3D imaging has become popular for analyzing material microstructures. When time lapse series of 3D pictures are acquired during a single experiment, it is possible to measure displacement fields via digital volume correlation (DVC), thereby leading to 4D results. Such ForewordThe present paper aims at reviewing the major developments in Digital Volume Correlation (DVC) over the past ten years. It follows the first review on DVC that was published in 2008 by its pioneer [11]. In the latter, the interested reader will find all the general principles associated with what is now called local DVC. They will not be recalled hereafter. In such approaches the region of interest is subdivided into small subvolumes that are independently registered. In addition to its wider use with local approaches, DVC has been extended to global approaches in which the displacement field is defined in a dense way over the region of interest. Kinematic bases using finite element discretizations have been selected. To further add mechanical content, elastic regularization has been introduced. Last, integrated approaches use kinematic fields that are constructed from finite element simulations with chosen constitutive equations. The material parameters (and/or boundary conditions) then become the quantities of interest.These various implementations assume different degrees of integration of mechanical knowledge about the analyzed experiment. First and foremost, DVC can be considered as a stand-alone technique, which has seen its field of applications grow over the last ten years. In this case the measured displacement fields and post-processed strain fields are reported. With the introduction of finite element based DVC, the measured displacement field is continuous. It is also a standalone technique. However, given the fact that it shares common kinematic bases with numerical simulations, it can be easily combined with the latter. One route is to require local satisfaction of equilibrium via mechanical regularization. Another route is to fully merge DVC analyses and numerical simulations via integrated approaches. Different examples will illustrate how these various integration steps can be tailored and what are the current challenges associated with various approaches.

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Imaging techniques for defect detection of fiber reinforced polymer‐bonded civil infrastructures

Qiu

2020

Struct Control Health Monit

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In-situ X-ray computed tomography characterisation of 3D fracture evolution and image-based numerical homogenisation of concrete

Cited by 170 publications

References 35 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

Digital Volume Correlation: Review of Progress and Challenges

Imaging techniques for defect detection of fiber reinforced polymer‐bonded civil infrastructures

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