Dual-energy X-ray micro-CT imaging of hybrid Ni/Al open-cell foam

0454537 - ÚTAM 2016 GB eng J - Článek v odborném periodiku
Fíla, T. - Kumpová, Ivana - Koudelka, P. - Zlámal, P. - Vavřík, Daniel - Jiroušek, O. - Jung, A.
Dual-energy X-ray micro-CT imaging of hybrid Ni/Al open-cell foam.
Journal of Instrumentation. Roč. 11, č. 1 (2016), C01005. ISSN 1748-0221. E-ISSN 1748-0221.
[International Workshop on Radiation Imaging Detectors (IWORID2015) /17./. Hamburg, 28.06.2015-02.07.2015]
Grant CEP: GA MŠMT(CZ) LO1219
Klíčová slova: computerized tomography (CT) * computed radiography (CR) * X-ray radiography and digital radiography (DR) * inspection with x-rays
Kód oboru RIV: JJ - Ostatní materiály
Impakt faktor: 1.220, rok: 2016
http://iopscience.iop.org/article/10.1088/1748-0221/11/01/C01005/pdf

In this paper, we employ dual-energy X-ray microfocus tomography (DECT) measurement to develop high-resolution finite element (FE) models that can be used for the numerical assessment of the deformation behaviour of hybrid Ni/Al foam subjected to both quasi-static and dynamic compressive loading. Cubic samples of hybrid Ni/Al open-cell foam with an edge length of [15]mm were investigated by the DECT measurement. The material was prepared using AlSi7Mg0.3 aluminium foam with a mean pore size of [0.85]mm, coated with nanocrystalline nickel (crystallite size of approx. [50]nm) to form a surface layer with a theoretical thickness of [0.075]mm. CT imaging was carried out using state-of-the-art DSCT/DECT X-ray scanner developed at Centre of Excellence Telč. The device consists of a modular orthogonal assembly of two tube-detector imaging pairs, with an independent geometry setting and shared rotational stage mounted on a complex 16-axis CNC positioning system to enable unprecedented measurement variability for highly-detailed tomographical measurements. A sample of the metal foam was simultaneously irradiated using an XWT-240-SE reflection type X-ray tube and an XWT-160-TCHR transmission type X-ray tube. An enhanced dual-source sampling strategy was used for data acquisition. X-ray images were taken using XRD1622 large area GOS scintillator flat panel detectors with an active area of [410 × 410]mm and resolution [2048 × 2048]pixels. Tomographic scanning was performed in 1,200 projections with a 0.3 degree angular step to improve the accuracy of the generated models due to the very complex microstructure and high attenuation of the investigated material. Reconstructed data was processed using a dual-energy algorithm, and was used for the development of a 3D model and voxel model of the foam. The selected parameters of the models were compared with nominal parameters of the actual foam and showed good correlation.
Trvalý link: http://hdl.handle.net/11104/0255203