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Shear-tensile crack as a source model for laboratory acoustic emission

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    SYSNO ASEP0500588
    Druh ASEPC - Konferenční příspěvek (mezinárodní konf.)
    Zařazení RIVO - Ostatní
    NázevShear-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, RID
    Zdroj.dok.52nd U.S. Rock Mechanics/Geomechanics Symposium. - s. l. : American Rock Mechanics Association, 2018 - ISBN N
    Poč.str.10 s.
    Forma vydáníTištěná - P
    AkceUS Rock Mechanics/Geomechanics Symposium /52./
    Datum konání17.06.2018 - 20.06.2018
    Místo konáníSeattle
    ZeměUS - Spojené státy americké
    Typ akceWRD
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Klíč. slovacompression testing ; compressive strength ; cracks ; inverse problems ; rock mechanics ; acoustic emission testing
    Vědní obor RIVDB - Geologie a mineralogie
    Obor OECDGeology
    Vědní obor RIV – spolupráceGeofyzikální ústav - Geologie a mineralogie
    CEPGA16-03950S GA ČR - Grantová agentura ČR
    GA18-08826S GA ČR - Grantová agentura ČR
    Institucionální podporaGLU-S - RVO:67985831 ; GFU-E - RVO:67985530
    EID SCOPUS85053461302
    AnotaceHere, 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.
    PracovištěGeologický ústav
    KontaktJana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
    Rok sběru2019
Počet záznamů: 1