Characterisation of mechanical properties of cellular ceramic materials using X-Ray computed tomography

2011 ◽  
pp. 39-46
Author(s):  
O. Caty ◽  
F. Gaubert ◽  
G. Hauss ◽  
G. Chollon
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Ceramic Materials ◽  
X Ray ◽  
X Ray Computed ◽  
Cellular Ceramic

scholarly journals Effect of Porosity on Mechanical Properties of 3D Printed Polymers: Experiments and Micromechanical Modeling Based on X-Ray Computed Tomography Analysis

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1154 ◽  
Author(s):  
Wang ◽  
Zhao ◽  
Fuh ◽  
Lee
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Fused Deposition Modeling ◽  
Micromechanical Model ◽  
Micromechanical Modeling ◽  
X Ray ◽  
Fused Deposition ◽  
3D Printed ◽  
X Ray Computed

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.

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

2014 ◽  
Vol 91 ◽  
pp. 70-78 ◽  
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.

scholarly journals Assessment of Mechanical Properties of Wood-Leather Panels and the Differences in the Panel Structure by Means of X-Ray Computed Tomography

BioResources ◽  
2012 ◽  
Vol 8 (1) ◽  
Author(s):  
Stefanie Wieland ◽  
Tilman Grünewald ◽  
Sven Ostrowski ◽  
Bernhard Plank ◽  
Gernot Standfest ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
X Ray ◽  
X Ray Computed

scholarly journals X-ray Computed Tomography Studies on Porosity Distribution in Vacuum Induction Cast Al-7Si Alloys

JOM ◽  
2021 ◽  
Author(s):  
James Mathew ◽  
Mark A. Williams ◽  
Prakash Srirangam
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Aluminum Alloys ◽  
Volume Fraction ◽  
3D Visualization ◽  
Vacuum Induction Melting ◽  
Induction Melting ◽  
Muffle Furnace ◽  
X Ray ◽  
X Ray Computed

AbstractPorosity in aluminum alloys is a great concern to the casting and automotive industry. In this publication, porosity formation in air-melted and vacuum induction melted (VIM) aluminum alloys was studied and compared to understand its effect on microstructure and mechanical properties of Al-7Si alloys. Al-7Si alloys were cast at 700°C and 900°C in a muffle furnace and VIM furnace. Microstructural results show that the alloys cast in muffle furnace refined the eutectic silicon compared with the cast samples prepared in VIM furnace. X-ray computed tomography (XCT) was used for three-dimensional (3D) visualization and quantification of porosity in these alloys. The volume fraction of pores was observed to be higher in alloy air-melted at 900°C compared with 700°C. XCT results from VIM alloy samples showed no significant porosity when cast at either 700°C or 900°C. The morphology of large pores in alloys air-melted at 700°C represents the formation of shrinkage porosity due to the incomplete flow of molten metal during solidification. Tensile test results show that the elongation property of VIM alloy was increased by more than 20% compared with air-melted alloy. The tensile strength and elongation were observed to be higher for alloy samples cast at 700°C compared with 900°C for both air-melted and VIM alloys. The findings from microstructure, XCT, and tensile tests show that vacuum induction melting improves the mechanical properties of the alloy compared with air-melted alloy.

Evaluation of Cured-in-Place Pipe Porosity Using CT and Microscopy

2021 ◽  
Vol 898 ◽  
pp. 81-86
Author(s):  
Jana Majerová ◽  
Rostislav Drochytka
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Service Life ◽  
Pore Structure ◽  
Uv Light ◽  
Optical Microscope ◽  
X Ray ◽  
X Ray Computed

It is assumed, that the pore content is related to other parameters of CIPP liners such as mechanical properties and service life or durability of pipelines. The article examines the pore structure of two different materials - composites pipes cured with steam and UV light. The pore structure was examined using an optical microscope and X-ray computed tomography (CT). The aim of the work was to verify the applicability of some methods for verifying the volume of air/gas in the cured composite.

Study of pore defect and mechanical properties in selective laser melted Ti6Al4V alloy based on X-ray computed tomography

2020 ◽  
Vol 797 ◽  
pp. 139981 ◽  
Author(s):  
Wei Liu ◽  
Chaoyue Chen ◽  
Sansan Shuai ◽  
Ruixin Zhao ◽  
Longtao Liu ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Mechanical Properties ◽  
Ti6al4v Alloy ◽  
X Ray ◽  
X Ray Computed
Sign in / Sign up

Export Citation Format

Share Document