Název: Analysis of mini-jack technique for in situ measurement of strength
Autoři: Kloiber, Michal ; Tippner, J. ; Kunecký, Jiří ; Sebera, V. ; Milch, J. ; Hrivnák, Jaroslav
Typ dokumentu: Příspěvky z konference
Konference/Akce: International Conference on Timber Bridges, ICTB 2017 /3./, Skelleftea (SE), 20170626
Rok: 2017
Jazyk: eng
Abstrakt: The paper presents a recently developed diagnostic technique for in situ determination of modulus of deformability (MODL) and conventional strength (CSL) parallel to the grain using the mini-jack inserted in bored hole. The mini-jack compression technique simulates the standard compression test, it is compared to that to examine its prediction strength (correlation coefficients). The paper shows an influence of moisture content of wood on experimental measurements using this technique. The measurement was carried out at spruce samples at three moisture contents of 12, 18 and 24%. The results of the tests prove a very good correlation of the strength determined by the proposed technique and wood density and strength determined at universal testing machine in compression parallel to the grain. The effect of the moisture content on the measurement by the mini-jack technique was proved to be significant. Beside that, the newly-developed instrument was also studied using digital image correlation (DIC) technique to analyze induced strains around the bored hole. This was studied on halved spruce samples. The DIC revealed symmetric character of the loading and significant differences between strains induced in tangential and longitudinal directions.
Klíčová slova: compression strength; in-situ testing; mini-jack technique; non-destructive testing; wood
Číslo projektu: DG16P02M026 (CEP)
Poskytovatel projektu: GA MK
Zdrojový dokument: Conference proceedings, ICTB 2017, 3rd International Conference on Timber Bridges, ISSN 0284-5172

Instituce: Ústav teoretické a aplikované mechaniky AV ČR (web)
Informace o dostupnosti dokumentu: Dokument je dostupný v příslušném ústavu Akademie věd ČR.
Původní záznam: http://hdl.handle.net/11104/0273570

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-373463


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav teoretické a aplikované mechaniky
Konferenční materiály > Příspěvky z konference
 Záznam vytvořen dne 2018-03-09, naposledy upraven 2021-11-24.


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