caa a22 4500 606150854 CHVBK 20210128100541.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10512-015-9965-x doi (NATIONALLICENCE)springer-10.1007/s10512-015-9965-x Fracture Toughness of VVER and PWR Uranium-Dioxide Fuel Pellets with Different Grain Size [Elektronische Daten] [V. Novikov, R. Sivov, E. Mikheev, A. Fedotov] The results of experimental studies of crack formation and fracture toughness of VVER and PWR uranium dioxide fuel pellets with different grain size are presented for the purpose of making a comparative analysis of their strength properties. It is found that as the grains increase in size their Young's modulus and the microhardness increase and the fracture toughness decreases. It is determined that for relatively small loads (to 1 kg) the formation of Palmqvist cracks is characteristic for uranium oxide pellets, and in the case of large grains they propagate freely over a large distance right through grains (transcrystallite propagation) while for small grains they propagate predominately along grain boundaries with branching (intercrystallite propagation). Springer Science+Business Media New York, 2015 Novikov V. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut Sivov R. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut Mikheev E. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut Fedotov A. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut Atomic Energy Springer US; http://www.springer-ny.com 118/2(2015-06-01), 117-123 1063-4258 118:2<117 2015 118 10512 https://doi.org/10.1007/s10512-015-9965-x text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10512-015-9965-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Novikov V. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut NATIONALLICENCE 700 1- Sivov R. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut NATIONALLICENCE 700 1- Mikheev E. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut NATIONALLICENCE 700 1- Fedotov A. Bochvar All-Russia Research Institute for Inorganic Materials (VNIINM), Moscow, Russia aut NATIONALLICENCE 773 0- Atomic Energy Springer US; http://www.springer-ny.com 118/2(2015-06-01), 117-123 1063-4258 118:2<117 2015 118 10512