Void deformation and breakup in shearing silica glass.
We study shear deformation and breakup of voids in silica glass using molecular dynamics simulations. With an increase in the shear strain, two kinds of defects--threefold-coordinated silicon and nonbridging oxygen atoms--appear as spherical voids deform elastically into ellipsoidal shapes. For shear strains epsilon>15%, nanocracks appear on void surfaces and voids deform plastically into a threadlike structure. Nanocracks are nucleated by the migration of threefold-coordinated Si and nonbridging O on -Si-O-Si-O- rings. For epsilon>40%, the threadlike structures break up into several fragments.
Chen
Yi-Chun
YC
Department of Physics and Astronomy, Collaboratory for Advanced Computing and Simulations, University of Southern California, Los Angeles, California 90089-0242, USA.
Nomura
Ken-ichi
K
Kalia
Rajiv K
RK
Nakano
Aiichiro
A
Vashishta
Priya
P
D003198:Computer Simulation; D005898:Glass / Q000737:chemistry*; D008956:Models, Chemical; D012822:Silicon Dioxide / Q000737:chemistry*
D012822:Silicon Dioxide