Void Deformation and Breakup in Shearing Silica Glass

被引：13

作者：

Chen, Yi-Chun ^{[1
]}

Nomura, Ken-ichi ^{[1
]}

Kalia, Rajiv K. ^{[1
,2
,3
]}

Nakano, Aiichiro ^{[1
,2
,3
]}

Vashishta, Priya ^{[1
,2
,3
]}

机构：

[1] Univ So Calif, Dept Phys & Astron Collaboratory Adv Comp & Simul, Los Angeles, CA 90089 USA

[2] Univ So Calif, Dept Chem Engn & Mat Sci Collaboratory Adv Comp &, Los Angeles, CA 90089 USA

[3] Univ So Calif, Dept Comp Sci Collaboratory Adv Comp & Simulat, Los Angeles, CA 90089 USA

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 03期

基金：

美国国家科学基金会;

关键词：

MOLECULAR-DYNAMICS; VITREOUS SILICA; SMALL DROPS; VISCOSITY; SIMULATIONS; FRACTURE; BUBBLES; STRESS; FLUID; FLOWS;

D O I：

10.1103/PhysRevLett.103.035501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

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