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In-situ X-ray differential micro-tomography for investigation of water-weakening in quasi-brittle materials subjected to four-point bending
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SYSNO ASEP 0523139 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title In-situ X-ray differential micro-tomography for investigation of water-weakening in quasi-brittle materials subjected to four-point bending Author(s) Koudelka_ml., Petr (UTAM-F) RID, SAI, ORCID
Fíla, Tomáš (UTAM-F) RID, SAI, ORCID
Rada, Václav (UTAM-F) ORCID, SAI, RID
Zlámal, Petr (UTAM-F) RID, SAI, ORCID
Šleichrt, Jan (UTAM-F) RID, ORCID, SAI
Vopálenský, Michal (UTAM-F) RID, ORCID, SAI
Kumpová, Ivana (UTAM-F) RID, SAI, ORCID
Beneš, Pavel (UTAM-F) RID, SAI
Vavřík, Daniel (UTAM-F) RID, SAI, ORCID
Vavro, Leona (UGN-S) RID
Vavro, Martin (UGN-S) RID, ORCID
Drdácký, Miloš (UTAM-F) RID, SAI, ORCID
Kytýř, Daniel (UTAM-F) SAI, RID, ORCIDNumber of authors 13 Article number 1405 Source Title Materials. - : MDPI - ISSN 1996-1944
Roč. 13, č. 6 (2020)Number of pages 17 s. Publication form Online - E Language eng - English Country CH - Switzerland Keywords fracture propagation ; in-situ X-ray 4D micro-CT ; differential tomography ; digital volume correlation ; quasi-brittle materials ; water-weakening ; four-point bending Subject RIV JJ - Other Materials OECD category Materials engineering Subject RIV - cooperation Institute of Geonics - Mining, incl. Coal Mining R&D Projects EF16_019/0000766 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Method of publishing Open access Institutional support UTAM-F - RVO:68378297 ; UGN-S - RVO:68145535 UT WOS 000529208000144 EID SCOPUS 85082668114 DOI https://doi.org/10.3390/ma13061405 Annotation Several methods, including X-ray radiography, have been developed for the investigation of the characteristics of water-saturated quasi-brittle materials. Here, the water content is one of the most important factors influencing their strength and fracture properties, in particular, as regards to porous building materials. However, the research concentrated on the three-dimensional fracture propagation characteristics is still significantly limited due to the problems encountered with the instrumentation requirements and the size e_ect. In this paper, we study the influence of the water content in a natural quasi-brittle material on its mechanical characteristics and fracture development during in-situ four-point bending by employing high-resolution X-ray di_erential micro-tomography. The cylindrical samples with a chevron notch were loaded using an in-house designed four-point bending loading device with the vertical orientation of the sample. The in-house designed modular micro-CT scanner was used for the visualisation of the specimen’s behaviour during the loading experiments. Several tomographic scans were performed throughout the force-displacement diagrams of the samples. The reconstructed 3D images were processed using an in-house developed di_erential tomography and digital volume correlation algorithms. The apparent reduction in the ultimate strength was observed due to the moisture content. The crack growth process in the water-saturated specimens was identified to be di_erent in comparison with the dry specimens Workplace Institute of Theoretical and Applied Mechanics Contact Kulawiecová Kateřina, kulawiecova@itam.cas.cz, Tel.: 225 443 285 Year of Publishing 2021 Electronic address https://doi.org/10.3390/ma13061405
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