Number of the records: 1  

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

  1. 1.
    SYSNO ASEP0500588
    Document TypeC - Proceedings Paper (int. conf.)
    R&D Document TypeO - Ostatní
    TitleShear-tensile crack as a source model for laboratory acoustic emission
    Author(s) 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
    Source Title52nd U.S. Rock Mechanics/Geomechanics Symposium. - s. l. : American Rock Mechanics Association, 2018 - ISBN N
    Number of pages10 s.
    Publication formPrint - P
    ActionUS Rock Mechanics/Geomechanics Symposium /52./
    Event date17.06.2018 - 20.06.2018
    VEvent locationSeattle
    CountryUS - United States
    Event typeWRD
    Languageeng - English
    CountryUS - United States
    Keywordscompression testing ; compressive strength ; cracks ; inverse problems ; rock mechanics ; acoustic emission testing
    Subject RIVDB - Geology ; Mineralogy
    OECD categoryGeology
    Subject RIV - cooperationGeophysical Institute - Geology ; Mineralogy
    R&D ProjectsGA16-03950S GA ČR - Czech Science Foundation (CSF)
    GA18-08826S GA ČR - Czech Science Foundation (CSF)
    Institutional supportGLU-S - RVO:67985831 ; GFU-E - RVO:67985530
    EID SCOPUS85053461302
    AnnotationHere, 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.
    WorkplaceInstitute of Geology
    ContactJana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272
    Year of Publishing2019
Number of the records: 1  

  This site uses cookies to make them easier to browse. Learn more about how we use cookies.