Aluminium Alloy Foam Modelling and Prediction of Elastic Properties Using X-ray Microcomputed Tomography

Heitor, Diogo Couto; Duarte, Isabel; Dias-de-Oliveira, João

doi:10.3390/met11060925

Cited by 14 publications

(9 citation statements)

References 61 publications

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“…28,46 In general, closed porosity refers to the volume fraction of the isolated void space within a scaffold, which is not connected to the open pores. 31 The pore size distribution profile (Figure 4c) shows that the pore sizes were in the range of 20−80 μm (22%), 100−200 μm (5−15%), and 200−350 μm (<0.6%) for Coll0. Interestingly, for all Coll bioscaffolds, the sizes of the smaller pores (20−80 μm) were about 15% higher, and the larger pores (100−350 μm) were about less than 1% compared to the Coll-free scaffold.…”

Section: Resultsmentioning

confidence: 98%

“…The observed values for closed porosity were in the range of 0.00–0.01%. These very low values indicated the presence of highly interconnected pores within the scaffold. , In general, closed porosity refers to the volume fraction of the isolated void space within a scaffold, which is not connected to the open pores . The pore size distribution profile (Figure c) shows that the pore sizes were in the range of 20–80 μm (22%), 100–200 μm (5–15%), and 200–350 μm (<0.6%) for Coll 0 .…”

Section: Resultsmentioning

confidence: 99%

“…The images were used to determine pore sizes using ImageJ/FIJI 1.53c software (National Institute of Health, USA) . The morphology of the samples and the micropores in the dry and wet states were analyzed using a SkyScan 1275 X-ray (Bruker, Kontich, Belgium) microcomputed tomography (micro-CT). , Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectra of the bioscaffolds were measured by using a PerkinElmer Spectrum GX Series-73565 FTIR system. Powder X-ray diffraction of the polymers and bioscaffolds was carried out with an X-ray diffractometer (XRD, Bruker D8 Advance, equipped with Cu K α radiation).…”

Section: Methodsmentioning

confidence: 99%

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3D-Printed Collagen–Nanocellulose Hybrid Bioscaffolds with Tailored Properties for Tissue Engineering Applications

Dobaj Štiglic,

Lackner,

Nagaraj

et al. 2023

ACS Appl. Bio Mater.

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Hybrid collagen (Coll) bioscaffolds have emerged as a promising solution for tissue engineering (TE) and regenerative medicine. These innovative bioscaffolds combine the beneficial properties of Coll, an important structural protein of the extracellular matrix, with various other biomaterials to create platforms for long-term cell growth and tissue formation. The integration or cross-linking of Coll with other biomaterials increases mechanical strength and stability and introduces tailored biochemical and physical factors that mimic the natural tissue microenvironment. This work reports on the fabrication of chemically cross-linked hybrid bioscaffolds with enhanced properties from the combination of Coll, nanofibrillated cellulose (NFC), carboxymethylcellulose (CMC), and citric acid (CA). The bioscaffolds were prepared by 3D printing ink containing Coll-NFC-CMC-CA followed by freeze-drying, dehydrothermal treatment, and neutralization. Cross-linking through the formation of ester bonds between the polymers and CA in the bioscaffolds was achieved by exposing the bioscaffolds to elevated temperatures in the dry state. The morphology, pores/porosity, chemical composition, structure, thermal behavior, swelling, degradation, and mechanical properties of the bioscaffolds in the dry and wet states were investigated as a function of Coll concentration. The bioscaffolds showed no cytotoxicity to MG-63 human bone osteosarcoma cells as tested by different assays measuring different end points. Overall, the presented hybrid Coll bioscaffolds offer a unique combination of biocompatibility, stability, and structural support, making them valuable tools for TE.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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3D-Printed Collagen–Nanocellulose Hybrid Bioscaffolds with Tailored Properties for Tissue Engineering Applications

Dobaj Štiglic,

Lackner,

Nagaraj

et al. 2023

ACS Appl. Bio Mater.

Self Cite

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“…The shape and size of the pores has a key influence on the final properties of the metallic foam [54]. Therefore, mastering the technology of filler material production is essential to be able to predict the properties of cast metallic foam [55,56].…”

Section: Methodsmentioning

confidence: 99%

Use of Molding Mixtures for the Production of Cast Porous Metals

Kroupová

Gawronová

Lichý

et al. 2022

Metals

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This paper aims to present the possibility of producing cast porous metals (or metallic foams) in a low-tech way by the use of conventional foundry technologies, i.e., the common procedures and materials. Due to the technological and economic complexity of the production processes of cast metallic foams, research into this material currently focuses on the development of less demanding technologies. The introduction of such production processes may help to exploit the full application potential of metallic foams. Within the framework of our proposed procedure, molding and core mixtures are used for the production of molds and filler material (space holder), also called precursors. It is the shape, size, and relative position of the individual precursors that determines the shape of the internal structure of the resulting metallic foam. The core mixture for the production of precursors is evaluated in terms of changes in properties with respect to storage time. Attention is focused on one of the most common bonding systems, furan no-bake. Casting tests are carried out for the possibility of making cast porous metals from aluminum alloy with different shapes of internal cavities depending on the different shapes of the filler material. The collapsibility of the cores after casting is evaluated for the test castings. The results show that even using commonly available materials and processes, cast metallic foams with complex internal structures can be produced.

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“…However, such an approach does not provide information on how the deformation of internal structure influences the overall mechanical response of an APM foam element. A possible solution is the use of advanced radiographical imaging methods to reveal the deformation processes within the microstructure of the specimen during a loading procedure [ 3 , 20 , 21 , 22 ]. Herein, the time-resolved 4D µCT experiments based on in-situ loading of a specimen in the X-ray scanner that is used for its simultaneous imaging enables capturing the deforming microstructure of the observed APM sample.…”

Section: Introductionmentioning

confidence: 99%

Fast 4D On-the-Fly Tomography for Observation of Advanced Pore Morphology (APM) Foam Elements Subjected to Compressive Loading

et al. 2021

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Observation of dynamic testing by means of X-ray computed tomography (CT) and in-situ loading devices has proven its importance in material analysis already, yielding detailed 3D information on the internal structure of the object of interest and its changes during the experiment. However, the acquisition of the tomographic projections is, in general, a time-consuming task. The standard method for such experiments is the time-lapse CT, where the loading is suspended for the CT scan. On the other hand, modern X-ray tubes and detectors allow for shorter exposure times with an acceptable image quality. Consequently, the experiment can be designed in a way so that the mechanical test is running continuously, as well as the rotational platform, and the radiographic projections are taken one after another in a fast, free-running mode. Performing this so-called on-the-fly CT, the time for the experiment can be reduced substantially, compared to the time-lapse CT. In this paper, the advanced pore morphology (APM) foam elements were used as the test objects for in-situ X-ray microtomography experiments, during which series of CT scans were acquired, each with the duration of 12 s. The contrast-to-noise ratio and the full-width-half-maximum parameters are used for the quality assessment of the resultant 3D models. A comparison to the 3D models obtained by time-lapse CT is provided.

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Aluminium Alloy Foam Modelling and Prediction of Elastic Properties Using X-ray Microcomputed Tomography

Cited by 14 publications

References 61 publications

3D-Printed Collagen–Nanocellulose Hybrid Bioscaffolds with Tailored Properties for Tissue Engineering Applications

3D-Printed Collagen–Nanocellulose Hybrid Bioscaffolds with Tailored Properties for Tissue Engineering Applications

Use of Molding Mixtures for the Production of Cast Porous Metals

Fast 4D On-the-Fly Tomography for Observation of Advanced Pore Morphology (APM) Foam Elements Subjected to Compressive Loading

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