Počet záznamů: 1
Dislocation emission and crack growth in 3D bcc iron crystals under biaxial loading by atomistic simulations
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SYSNO ASEP 0508315 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Dislocation emission and crack growth in 3D bcc iron crystals under biaxial loading by atomistic simulations Tvůrce(i) Uhnáková, Alena (UT-L) RID, ORCID
Machová, Anna (UT-L) RID, ORCID
Hora, Petr (UT-L) RID, ORCIDCelkový počet autorů 3 Číslo článku 075115 Zdroj.dok. Journal of Applied Physics. - : AIP Publishing - ISSN 0021-8979
Roč. 126, č. 7 (2019)Poč.str. 11 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova nano-cracks ; dislocation emission ; ductile-brittle transition ; T-stress ; bcc iron ; molecular dynamics Vědní obor RIV JG - Hutnictví, kovové materiály Obor OECD Materials engineering CEP GA17-12925S GA ČR - Grantová agentura ČR EF15_003/0000493 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy Způsob publikování Omezený přístup Institucionální podpora UT-L - RVO:61388998 UT WOS 000483849000035 EID SCOPUS 85071124624 DOI 10.1063/1.5109949 Anotace This paper is devoted to the study of the ductile-brittle behavior of a central nanocrack (1¯10)[110] (crack plane/crack front) under biaxial loading via free 3D molecular dynamics (MD) simulations, as well as the comparison of MD results with continuum predictions concerning T-stress. The so called T-stress is a constant stress component acting along the crack plane, which should be considered (together with the stress intensity factor K) in the assessment of brittle-ductile behavior, namely, in the case of the short cracks. Previous 2D atomistic simulations under plane strain conditions indicated that the level of T-stress (controlled by the biaxiality ratio σB/σA from the external loading) affects dislocation emission from the crack and can cause the ductile-brittle transition. The plane strain simulations using the periodic or translational boundary conditions in the bcc lattice have certain limitations: they enable the in-plane dislocation emission (Burgers vector lies in the observation plane), but they do not allow the complete dislocation emission on the all slip systems favored by the shear stress. As presented, our new free 3D atomistic simulations (without periodic or symmetry conditions) enable the activity of the all favored slip systems. Thus, they offer a more realistic insight into the microscopic processes generated by the crack itself in dependence on the T-stress level. Pracoviště Ústav termomechaniky Kontakt Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Rok sběru 2020 Elektronická adresa https://aip.scitation.org/doi/pdf/10.1063/1.5109949?class=pdf
Počet záznamů: 1