Growth of a brittle crack (001) in 3D bcc iron crystal with a Cu nano-particle

0421102 - ÚT 2014 RIV NL eng J - Journal Article
Uhnáková, Alena - Machová, Anna - Hora, Petr - Červená, Olga
Growth of a brittle crack (001) in 3D bcc iron crystal with a Cu nano-particle.
Computational Materials Science. Roč. 83, February (2014), s. 229-234. ISSN 0927-0256. E-ISSN 1879-0801
R&D Projects: GA ČR GA101/09/1630
Institutional support: RVO:61388998
Keywords : brittle crack extension * 3D * mode I * bcc iron * Cu nano-particle * molecular dynamics * acoustic emission
Subject RIV: JG - Metallurgy
Impact factor: 2.131, year: 2014
http://www.sciencedirect.com/science/article/pii/S0927025613006575

Paper deals with crack extension under mode I in a 3D crystal of bcc iron with a small Cu inhomogeneity in front of the crack via 3D atomistic simulations by molecular dynamics. The results show that after fast Cu penetration crack extension differs from that in pure bcc iron. While in pure bcc Fe the crack front remains straight during brittle crack extension, in the Fe-Cu crystal crack front wave of the type 3/2 l arises, modulated by shorter atomic waves. Wave minimum is at Cu-particle since Cu retards locally the crack due to changes in the stress field after the penetration. As a consequence, acoustic emission on crack faces is corrugated as well.
Permanent Link: http://hdl.handle.net/11104/0227834