Stress Field and Damage Evolution in C/SiC Woven Composites: Image-Based Finite Element Analysis and in situ X-Ray Computed Tomography Tests

2020 ◽  
Author(s):  
Ai Shigang ◽  
Song Weili ◽  
Chen Yanfei ◽  
J.N. Reddy ◽  
Fang Daining
Keyword(s):  
Computed Tomography ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Field ◽  
Damage Evolution ◽  
Woven Composites ◽  
Element Analysis ◽  
X Ray ◽  
X Ray Computed

scholarly journals Linear Elastic FE-Analysis of Porous, Laser Welded, Heat Treatable, Aluminium High Pressure Die Castings Based on X-Ray Computed Tomography Data

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1420
Author(s):  
Fabian Teichmann ◽  
Arne Ziemer ◽  
Martin Leitner ◽  
Jonas Hensel ◽  
Klaus Dilger
Keyword(s):  
Computed Tomography ◽  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Incomplete Fusion ◽  
Element Analysis ◽  
X Ray ◽  
Linear Elastic ◽  
X Ray Computed ◽  
Die Castings

The welding of aluminium high pressure die castings is a well known and broadly investigated challenge in various fields of industry and research. Prior research in this specific field mainly focused on the optimisation of the welding and the casting process and on the cause of the frequently occurring porosity and incomplete fusion phenomena, whereas the impacts of these defects have hardly been addressed. Therefore, the underlying study presents the investigation of weldments in EN AC-AlSi10MnMg high pressure aluminium die castings by linear elastic finite element analysis based on X-ray computed tomography as a novel approach. Hereby, four laser weldments with differing surfaces and pore contents were investigated by X-ray computed tomography and tensile testing. Based on the voxel datasets of the porous weldments, triangular finite element meshes were generated and a numerical finite element analysis was conducted. Good agreement of the stress–strain curves between the simulations and the experiments was achieved.

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.

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