Image processing for the non-destructive characterization of porous media. Application to limestones and trabecular bones

Almhdie, Ahmad; Rozenbaum, Olivier; Lespessailles, Éric; Jennane, Rachid

doi:10.1016/j.matcom.2013.07.003

Cited by 13 publications

(6 citation statements)

References 32 publications

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“…For simplicity, the method developed earlier by the authors (Lakshmikantha, Prat, and Ledesma 2009) was chosen. Characterization of soil properties and features by means of nondestructive methods such as image processing is a growing field (Almhdie et al 2014;Aydemir, Keskin, and Drees 2004;Liu et al 2011;Liu et al 2013;Peng et al 2006; Shit, Bhunia, and Maiti 2015) not only for geometrical and surface characterization but also for more fundamental soil properties (Lu and Kaya 2013). However, the use of more sophisticated image postprocessing was beyond the scope of the work presented in this article.…”

Section: Figmentioning

confidence: 99%

Boundary Effects in the Desiccation of Soil Layers with Controlled Environmental Conditions

2018

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This article presents the results of an experimental research carried to investigate the mechanics of cracking of soil layers under drying conditions. The tests were conducted under controlled laboratory conditions and in an environmental chamber with circular and rectangular specimens to investigate the effect of the boundary conditions (size, shape, and aspect ratio of the specimens and containers) on the process of initiation and propagation of cracks and on the final crack pattern at the end of desiccation. The tests in the environmental chamber were conducted with imposed temperature and relative humidity and provided new insight into the mechanics of the formation of cracks in a drying soil, and they showed that cracks can initiate either at the top, bottom, or at both surfaces of the drying specimen. The results also reveal how the crack patterns are controlled by the existing mechanical and hydraulic boundary conditions. The cracks seem to form sequentially in patterns that can be explained by three key factors: stresses higher than the tensile strength, the direction of the generated stresses, and the stress redistribution in the vicinity or inside the newly formed domain. In order to substantiate the sequential nature of the crack pattern formation, experimental evidences showing the existence of a cracking sequence during the laboratory desiccation experiments are presented and analyzed.

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Section: Figmentioning

confidence: 99%

Boundary Effects in the Desiccation of Soil Layers with Controlled Environmental Conditions

2018

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“…The median filter consists of replacing a pixel value by the median value of a selected neighborhood pattern. The median smoothing technique is used in studies dealing with contaminant hydrology or porous media characterization, mainly with radii from 1 to 3 pixels (i.e., from 3 × 3-to 7 × 7-pixel squares) [29,34,65,66]. Nonetheless, filtering techniques are sometimes counter indicated, because they can have a negative effect on the sharp edges, i.e., they introduce diffusion, which affects the resolution and the identification of edges [67,68].…”

Section: First Experiment: Simple Drainage-imbibition Cyclementioning

confidence: 99%

Laboratory Experiments of Drainage, Imbibition and Infiltration under Artificial Rainfall Characterized by Image Analysis Method and Numerical Simulations

Belfort

Weill

Fahs

et al. 2019

Water

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Two laboratory experiments consisting of drainage/imbibition and rainfall were carried out to study flow in variably saturated porous media and to test the ability of a new measurement method. 2D maps of water content are obtained through a non-invasive image analysis method based on photographs. This method requires classical image analysis steps, i.e., normalization, filtering, background subtraction, scaling and calibration. The procedure was applied and validated for a large experimental tank of internal dimensions 180 cm long, 120 cm wide and 4 cm deep that had been homogenously packed with monodisperse quartz sand. The calibration curve relating water content and reflected light intensities was established during the main monitoring phase of each experiment, making this procedure very advantageous. Direct measurements carried out during the water flow experiments correspond to water content, pressure head, temperature, and cumulative outflow. Additionally, a great advantage of the proposed method is that it does not require any tracer or dye to be injected into the flow tank. The accuracy and other benefits of our approach were also assessed using numerical simulations with state-of-the-art computational code that solves Richards’ equation.

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“…Recent advances in imaging techniques, especially the 3D micro X-ray computed tomography (XCT) technique, have made it possible to characterise microstructures for various composite materials with high resolution but without destruction of the materials. For example, it has been applied to characterisation of steel fibres in self-compacting concrete [2], measurement of porosity and aggregate properties in porous concrete [3], shape and surface analyses of coarse aggregates in normal and lightweight concrete [4,5], and evaluation of microarchitectures of limestone and trabecular bones [6]. In situ XCT tests, which scan 3D internal microstructures under progressive loading and environmental factors so that the structural damage and fracture evolution can be examined in relation to external factors, have also been rapidly Figure 2: Propagation of internal microcracks in a CT slice as the load increases.…”

Section: Introductionmentioning

confidence: 99%

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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Image processing for the non-destructive characterization of porous media. Application to limestones and trabecular bones

Cited by 13 publications

References 32 publications

Boundary Effects in the Desiccation of Soil Layers with Controlled Environmental Conditions

Boundary Effects in the Desiccation of Soil Layers with Controlled Environmental Conditions

Laboratory Experiments of Drainage, Imbibition and Infiltration under Artificial Rainfall Characterized by Image Analysis Method and Numerical Simulations

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

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