0518752 - ÚJF 2022 RIV US eng J - Článek v odborném periodiku
Knapek, Michal - Kušnír, J. - Húlan, T. - Minárik, P. - Csáki, Štefan - Lukáč, František - Dobroň, P. - Chmelík, F.
Mechanical properties of illite-based ceramics with controlled porosity studied by modern in situ techniques.
Journal of the American Ceramic Society. Roč. 103, č. 4 (2020), s. 2780-2790. ISSN 0002-7820. E-ISSN 1551-2916
Grant CEP: GA MŠMT EF16_013/0001794
Institucionální podpora: RVO:61389005 ; RVO:61389021
Klíčová slova: acoustic emission * ceramics * deformation * digital image correlation * illite
Obor OECD: Nuclear related engineering; Materials engineering (UFP-V)
Impakt faktor: 3.784, rok: 2020
Způsob publikování: Omezený přístup
https://doi.org/10.1111/jace.16940

Deformation tests combined with modern in situ acoustic emission (AE) and digital image correlation (DIC) techniques were applied to monitor low strain rate compressive behavior of illite-based ceramics with controlled porosity (P). A strong effect of porosity on the mechanical performance was observed: Young's modulus decreased linearly from 29.4 +/- 1.1 GPa (P = 14 vol%) to 3.0 +/- 0.5 GPa (P = 55 vol%) and compressive strength decreased from 307 +/- 13.6 MPa (P = 14 vol%) to 27.7 +/- 1.0 MPa (P = 55 vol%). The AE and DIC techniques revealed a transition from brittle fracture to gradual localized crushing with increasing porosity. The AE signals possessed high-energy burst-like characteristics typical of brittle fracture and (micro)cracking. The AE data showed continuous activity from the beginning of loading, suggesting that true elasticity does not occur in this material. The combination of mechanical tests with in situ techniques, therefore, proved to be particularly effective in providing additional information on the deformation dynamics in ceramics.
Trvalý link: http://hdl.handle.net/11104/0306760