TY - JOUR
T1 - Mechanics of nanocrack
T2 - Fracture, dislocation emission, and amorphization
AU - Huang, Shan
AU - Zhang, Sulin
AU - Belytschko, Ted
AU - Terdalkar, Sachin S.
AU - Zhu, Ting
N1 - Funding Information:
SH and TZ are supported by the NSF Grants CMMI-0758554 and CMMI-0758265. SZ acknowledges the support under the NSF Grants CMMI-0826841 and CMMI-0600642. TB acknowledges his support under Army Research Office under Grants W911NF-05-1-0049/P00002 and W911NF-08-1-0212.
PY - 2009/5
Y1 - 2009/5
N2 - Understanding the nanoscale fracture mechanisms is critical for tailoring the mechanical properties of materials at small length scales. We perform an atomistic study to characterize the formation and extension of nano-sized cracks. By using atomistic reaction pathway calculations, we determine the energetics governing the brittle and ductile responses of an atomically sharp crack in silicon, involving the competing processes of cleavage bond breaking, dislocation emission, and amorphization by the formation of five- and seven-membered rings. We show that the nanoscale fracture process depends sensitively on the system size and loading method. Our results offer new perspectives on the brittle-to-ductile transition of fracture at the nanoscale.
AB - Understanding the nanoscale fracture mechanisms is critical for tailoring the mechanical properties of materials at small length scales. We perform an atomistic study to characterize the formation and extension of nano-sized cracks. By using atomistic reaction pathway calculations, we determine the energetics governing the brittle and ductile responses of an atomically sharp crack in silicon, involving the competing processes of cleavage bond breaking, dislocation emission, and amorphization by the formation of five- and seven-membered rings. We show that the nanoscale fracture process depends sensitively on the system size and loading method. Our results offer new perspectives on the brittle-to-ductile transition of fracture at the nanoscale.
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U2 - 10.1016/j.jmps.2009.01.006
DO - 10.1016/j.jmps.2009.01.006
M3 - Article
AN - SCOPUS:64049088211
SN - 0022-5096
VL - 57
SP - 840
EP - 850
JO - Journal of the Mechanics and Physics of Solids
JF - Journal of the Mechanics and Physics of Solids
IS - 5
ER -