Visualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiography

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dc.contributor.authorVavro, Leonacs
dc.contributor.authorSouček, Kamilcs
dc.contributor.authorKytýř, Danielcs
dc.contributor.authorFíla, Tomášcs
dc.contributor.authorKeršner, Zbyněkcs
dc.contributor.authorVavro, Martincs
dc.coverage.issue1cs
dc.coverage.volume2017cs
dc.date.accessioned2020-07-29T06:57:04Z
dc.date.available2020-07-29T06:57:04Z
dc.date.issued2017-07-01cs
dc.description.abstractThe article deals with the use of computed X-ray radiography to visualize the development of the fracture process zone in the rock samples. For radiographic observations during the three-point bending loading, glauconitic sandstone from the Řeka quarry (sometimes also referred to as Godula sandstone) was used. The chevron-notched cylindrical specimens with the diameter of 29 mm and 120 mm nominal length were prepared from the sandstone blocks. These specimens were subjected to the Chevron Bend (CB) test carried out in accordance with the ISRM suggested methodology; the span was 94 mm. The evolution of the fracture process zone was continuously scanned using X-ray radiography during the realized Mode I fracture toughness tests (FTT). The scanning was conducted using an industrial X-ray micro-tomographic inspection system equipped with a flat panel X-ray detector of 4,000 × 4,000 pixels and micro-focus X-ray source with reflection target, which are very suitable for obtaining highly detailed radiographic images during the FTT tests. Three-point bending tests were carried out using an in-house designed table-top loading device, construction of which allows precise control of the loading during testing. Continuous X-ray examination and subsequent radiographic image analysis enable investigation of the crack initiation and the process zone development during FTT and represents a useful tool for a better understanding of failure behavior of the rock material during the loading process.en
dc.description.abstractThe article deals with the use of computed X-ray radiography to visualize the development of the fracture process zone in the rock samples. For radiographic observations during the three-point bending loading, glauconitic sandstone from the Řeka quarry (sometimes also referred to as Godula sandstone) was used. The chevron-notched cylindrical specimens with the diameter of 29 mm and 120 mm nominal length were prepared from the sandstone blocks. These specimens were subjected to the Chevron Bend (CB) test carried out in accordance with the ISRM suggested methodology; the span was 94 mm. The evolution of the fracture process zone was continuously scanned using X-ray radiography during the realized Mode I fracture toughness tests (FTT). The scanning was conducted using an industrial X-ray micro-tomographic inspection system equipped with a flat panel X-ray detector of 4,000 × 4,000 pixels and micro-focus X-ray source with reflection target, which are very suitable for obtaining highly detailed radiographic images during the FTT tests. Three-point bending tests were carried out using an in-house designed table-top loading device, construction of which allows precise control of the loading during testing. Continuous X-ray examination and subsequent radiographic image analysis enable investigation of the crack initiation and the process zone development during FTT and represents a useful tool for a better understanding of failure behavior of the rock material during the loading process.cs
dc.formattextcs
dc.format.extent689-696cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationProcedia Engineering. 2017, vol. 2017, issue 1, p. 689-696.en
dc.identifier.doi10.1016/j.proeng.2017.05.233cs
dc.identifier.issn1877-7058cs
dc.identifier.other146060cs
dc.identifier.urihttp://hdl.handle.net/11012/193248
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofProcedia Engineeringcs
dc.relation.urihttps://www.sciencedirect.com/science/article/pii/S1877705817323731cs
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1877-7058/cs
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/cs
dc.subjectFracture process zoneen
dc.subjectfracture toughnessen
dc.subjectChevron Bend (CB) testen
dc.subjectglauconitic sandstoneen
dc.subjectX-ray radiographyen
dc.subjectFracture process zone
dc.subjectfracture toughness
dc.subjectChevron Bend (CB) test
dc.subjectglauconitic sandstone
dc.subjectX-ray radiography
dc.titleVisualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiographyen
dc.title.alternativeVisualization of the Evolution of the Fracture Process Zone in Sandstone by Transmission Computed Radiographycs
dc.type.driverconferenceObjecten
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-146060en
sync.item.dbtypeVAVen
sync.item.insts2020.07.29 08:57:04en
sync.item.modts2020.07.29 08:17:52en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav stavební mechanikycs
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