Physical and mechanical properties of municipal solid waste incineration residues with cement and coal fly ash using X-ray Computed Tomography scanners

Additive manufacturing (commonly known as 3D printing) is defined as a family of technologies that deposit and consolidate materials to create a 3D object as opposed to subtractive manufacturing methodologies. Fused deposition modeling (FDM), one of the most popular additive manufacturing techniques, has demonstrated extensive applications in various industries such as medical prosthetics, automotive, and aeronautics. As a thermal process, FDM may introduce internal voids and pores into the fabricated thermoplastics, giving rise to potential reduction on the mechanical properties. This paper aims to investigate the effects of the microscopic pores on the mechanical properties of material fabricated by the FDM process via experiments and micromechanical modeling. More specifically, the three-dimensional microscopic details of the internal pores, such as size, shape, density, and spatial location were quantitatively characterized by X-ray computed tomography (XCT) and, subsequently, experiments were conducted to characterize the mechanical properties of the material. Based on the microscopic details of the pores characterized by XCT, a micromechanical model was proposed to predict the mechanical properties of the material as a function of the porosity (ratio of total volume of the pores over total volume of the material). The prediction results of the mechanical properties were found to be in agreement with the experimental data as well as the existing works. The proposed micromechanical model allows the future designers to predict the elastic properties of the 3D printed material based on the porosity from XCT results. This provides a possibility of saving the experimental cost on destructive testing.

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Predicting Density and Moisture Content of Populus xiangchengensis and Phyllostachys edulis using the X-Ray Computed Tomography Technique

Forest Products Journal ◽

10.13073/fpj-d-20-00001 ◽

2020 ◽

Vol 70 (2) ◽

pp. 193-199

Author(s):

Qingping Wang ◽

Xing'e Liu ◽

Shumin Yang

Keyword(s):

Computed Tomography ◽

Moisture Content ◽

Linear Models ◽

Physical And Mechanical Properties ◽

Phyllostachys Edulis ◽

Ct Number ◽

X Ray ◽

Ct Technique ◽

Significant Difference ◽

X Ray Computed

Abstract Density (D) and moisture content (MC) are two important physical properties of wood and bamboo, which are highly correlated with many other physical and mechanical properties. In this study, the X-ray computed tomography (CT) technique was used to determine the D and MC of poplar (Populus xiangchengensis) and bamboo (Phyllostachys edulis). There was a statistically significant difference in the CT-measured numbers for D and MC between these species. The D-CT and MC-CT linear models for both species were independently established: Dpoplar = 0.00098 × H + 1.02603, Dbamboo = 0.00118 × H + 0.98684, MCpoplar = 0.00309 × H + 1.89982, and MCbamboo = 0.00131 × H + 0.31488, where H is the CT number. The determination coefficients, R2, of the models were all higher than 0.97. Additionally, the R2 values obtained for model validation were also all higher than 0.97. These results indicated that it is feasible to reliably determine D and MC of wood and bamboo using the X-ray CT technique. This study aims to provide reference data for CT detection of the D and MC of wood and bamboo.

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Erratum to: Preliminary Application of X-ray Computed Tomography on Characterisation of Polish Gas Shale Mechanical Properties

Rock Mechanics and Rock Engineering ◽

10.1007/s00603-016-1117-7 ◽

2016 ◽

Vol 49 (12) ◽

pp. 4965-4965

Author(s):

M. Cała ◽

K. Cyran ◽

A. Stopkowicz ◽

M. Kolano ◽

M. Szczygielski

Keyword(s):

Computed Tomography ◽

Mechanical Properties ◽

Gas Shale ◽

X Ray ◽

X Ray Computed ◽

Preliminary Application

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Modeling the Properties of Cellular Ceramics: From Foams to Lattices and Back to Foams

Advances in Science and Technology ◽

10.4028/www.scientific.net/ast.91.70 ◽

2014 ◽

Vol 91 ◽

pp. 70-78 ◽

Cited By ~ 4

Author(s):

Alberto Ortona ◽

Ehsan Rezaei

Keyword(s):

Computed Tomography ◽

Mechanical Properties ◽

Finite Element Analysis ◽

Replica Method ◽

Harsh Environments ◽

Morphological Parameters ◽

Element Analysis ◽

Ceramic Foams ◽

X Ray ◽

X Ray Computed

Cellular ceramics are attracting material solutions for high temperature applications because of their outstanding properties. SiC cellular ceramics in particular withstand harsh environments at high temperatures for long operating times and are particularly resistant to thermal shock. Ceramic foams though, being random fragile structures, comprise properties which are rather scattered and difficult to engineer. This presentation shows how finite element analysis is used to study the effect of morphological features on ceramic foams in respect of their mechanical properties. Mean morphological parameters, obtained by X-ray computed tomography (XCT) on a commercially available SiSiC foam produced by the replica method, were used to generate a set of lattices in which one parameter was varied at a time. Starting from this approach, further work was then dedicated to optimize their properties. Polymeric lattices and foams, in which some characteristics were digitally modified learning from the optimization work were, produced by 3D printing and ceramized via the replica method. Both foams and lattices were then mechanically tested. Results show that some features such as strut shape and cell stretching affect the mechanical behavior of ceramic foams.

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