Počet záznamů: 1
Shear-tensile crack as a source model for laboratory acoustic emission
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SYSNO ASEP 0500588 Druh ASEP C - Konferenční příspěvek (mezinárodní konf.) Zařazení RIV O - Ostatní Název Shear-tensile crack as a source model for laboratory acoustic emission Tvůrce(i) Petružálek, Matěj (GLU-S) RID, SAI, ORCID
Lokajíček, Tomáš (GLU-S) RID, SAI, ORCID
Svitek, Tomáš (GLU-S) SAI, RID
Jechumtálová, Zuzana (GFU-E) ORCID, RID
Kolář, Petr (GFU-E) ORCID, RID
Adamová, Petra (GFU-E) ORCID, RID
Šílený, Jan (GFU-E) ORCID, RIDZdroj.dok. 52nd U.S. Rock Mechanics/Geomechanics Symposium. - s. l. : American Rock Mechanics Association, 2018 - ISBN N Poč.str. 10 s. Forma vydání Tištěná - P Akce US Rock Mechanics/Geomechanics Symposium /52./ Datum konání 17.06.2018 - 20.06.2018 Místo konání Seattle Země US - Spojené státy americké Typ akce WRD Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova compression testing ; compressive strength ; cracks ; inverse problems ; rock mechanics ; acoustic emission testing Vědní obor RIV DB - Geologie a mineralogie Obor OECD Geology Vědní obor RIV – spolupráce Geofyzikální ústav - Geologie a mineralogie CEP GA16-03950S GA ČR - Grantová agentura ČR GA18-08826S GA ČR - Grantová agentura ČR Institucionální podpora GLU-S - RVO:67985831 ; GFU-E - RVO:67985530 EID SCOPUS 85053461302 Anotace Here, a shear-tensile crack (STC) model is presented as suitable for Acoustic Emission (AE) events and compared to a traditional MT (Moment Tensor) approach. Experimental data was obtained from a uniaxial compression test performed on a Westerly Granite (WG) specimen using a 14 channel AE monitoring system. The STC is a physical source, which describes anticipated fracture modes: Shear-slip and opening/closing tensile crack. It is described by fewer parameters (5 instead of the 6 for MT), which is essential for solving the inverse problem. The presented STC procedure was tested on 38 AE events selected over a range of 50 – 98% for the uniaxial compressive strength. As compared to the MT, the STC model displayed a similar fit for input data while providing far smaller confidence regions. The results indicate a more certain determination for the mechanism orientation and improved reliability for the decomposition components. In addition, use of STC model allowed better distinction between tension and shear type for AE events, which may be a crucial for recognizing an approaching failure. For our experiment, application of the STC model proved to be useful for recognizing the threshold of unstable microcracking. Pracoviště Geologický ústav Kontakt Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Rok sběru 2019
Počet záznamů: 1