Počet záznamů: 1
Heat treatment and mechanics of Moravian Jurassic cherts
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SYSNO ASEP 0546234 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Heat treatment and mechanics of Moravian Jurassic cherts Tvůrce(i) Moník, M. (CZ)
Hadraba, Hynek (UFM-A) RID, ORCID
Milde, D. (CZ)
Chlup, Zdeněk (UFM-A) RID, ORCID
Nerudová, Z. (CZ)
Schnabl, Petr (GLU-S) RID, SAI, ORCIDCelkový počet autorů 6 Číslo článku 158 Zdroj.dok. Archaeological and Anthropological Sciences. - : Springer - ISSN 1866-9557
Roč. 13, č. 10 (2021)Poč.str. 14 s. Jazyk dok. eng - angličtina Země vyd. DE - Německo Klíč. slova Chert ; Elastic modulus ; Fracture toughness ; Heat treatment ; Infrared spectroscopy Vědní obor RIV JL - Únava materiálu a lomová mechanika Obor OECD Mechanical engineering Vědní obor RIV – spolupráce Geologický ústav - Archeologie, antropologie, etnologie CEP GA18-02606S GA ČR - Grantová agentura ČR GA20-10035S GA ČR - Grantová agentura ČR Způsob publikování Omezený přístup Institucionální podpora GLU-S - RVO:67985831 ; UFM-A - RVO:68081723 UT WOS 000693245200001 EID SCOPUS 85114447093 DOI https://doi.org/10.1007/s12520-021-01388-z Anotace Experimental heat treatment was applied to Moravian (Czech Republic) Jurassic cherts of Olomučany type to find whether it leads to better flaking properties. Indentation tests and other tests were used and compared with the changes in infrared (NIR) spectra which are usually indicative of mechanical changes linked with water loss from the material. The indentation tests provided ambiguous results due to irregular propagation of cracks from indent corners. On the other hand, three-point-load fracturing and resonance tests were usable and indicated that the cherts are best flakeable after heating to 300 °C when fracture toughness is reduced whereas elastic modulus increases. These two changes complement each other: The first causes easier flakeability and the other more stable crack propagation and predictability. The simultaneous formation of fluid inclusions probably contributes to swifter crack propagation. As shown by our sequence statistics analysis, the drop in fracture toughness seems to be a more gradual process, whereas the increase in stiffness at 300 °C is rather sudden. The fact that the Olomučany chert or other fine-grained lithologies were not heat-treated in the prehistory of eastern Central Europe indicates that the improvement by heat treatment was not practised in this area in prehistory, unlike in more westerly regions. This may be due to long-distance imports of other, finer-grained lithologies, a strategy frequented in the region since 40,000 BCE. Pracoviště Ústav fyziky materiálu Kontakt Yvonna Šrámková, sramkova@ipm.cz, Tel.: 532 290 485 Rok sběru 2022 Elektronická adresa https://link.springer.com/article/10.1007%2Fs12520-021-01388-z
Počet záznamů: 1