A Comment on Random Versus Non-Random Defect Placement in Polyacetylane

1988 ◽  
Author(s):  
Stuart B. Clough ◽  
Sukant Tripathy ◽  
Xiao-Fang Sun ◽  
Bradley J. Orchard ◽  
Gary Wnek
Keyword(s):  
Random Defect

Effects of random defect distributions in the barrier coating on the gas permeability of multilayer films

2016 ◽  
Vol 302 ◽  
pp. 65-74 ◽  
Author(s):  
Enrico Toni ◽  
Marco Giacinti Baschetti ◽  
Cesare Lorenzetti ◽  
Pierre Fayet ◽  
Giulio C. Sarti
Keyword(s):  
Gas Permeability ◽  
Multilayer Films ◽  
Barrier Coating ◽  
Random Defect

BRITTLE FRAGMENTATION OF AN EXPANDING RING BY MOLECULAR DYNAMICS

2013 ◽  
Vol 02 (02) ◽  
pp. 1350010
Author(s):  
GUOWU REN ◽  
TIEGANG TANG ◽  
ZHAOLIANG GUO ◽  
YUANSHUAI YANG ◽  
QINGZHONG LI
Keyword(s):  
Strain Rate ◽  
Physical Mechanism ◽  
High Strain ◽  
Fragmentation Process ◽  
Strain Rates ◽  
Anisotropic Behavior ◽  
Wide Range ◽  
Low Strain Rate ◽  
Brittle Fragmentation ◽  
Random Defect

In this paper, the brittle fragmentation of an expanding ring is numerically studied by a simple atomistic model. We investigate the statistical distribution of fragment spanned over a wide range of strain rates when damage related to broken bond reaches a steady state. It is shown that at low strain rate limited number of heavy fragments can be generated because of anisotropic behavior while for high strain rate fragment can be well fitted with Weibull distribution. The physical mechanism of fragmentation process reveals that damage accompanying with numerous microcracks is found to initiate in the inner regime of the expanding ring. Furthermore, we discuss the effect of random defect on the fragmentation process.

Nucleation on Defects in Heteroepitaxy

1996 ◽  
Vol 440 ◽  
Author(s):  
J. A. Venables
Keyword(s):  
Point Defects ◽  
Rate Equation ◽  
Nucleation And Growth ◽  
Diffusion Equations ◽  
Growth Stages ◽  
Practical Application ◽  
Defect Sites ◽  
New Models ◽  
And Diffusion ◽  
Random Defect

AbstractThe rate equation treatment of nucleation and growth on perfect substrates has been extended to cover nucleation on random defect sites, and problems involving 1-dimensional (1D) diffusion to sinks. This paper recaps the results of rate equation treatments on perfect terraces, and sumnarises some new models, including: 1) nucleation on point defects, with application to nm-sized Fe and Co particles grown on various CaF2substrates; 2) nucleation and diffusion in finite 1D deposits, with application to diffusion over, and the break-up of, multilayer deposits of Ag/Ge(111) and Ag/Fe(110); 3) 1D models developed for nucleation in competition with step capture. Comparison of rate-diffusion equations with experiment can result in values for, or bounds on, the controlling energies, in a way which illuminates the main features of interatomic forces at surfaces. The use of defects to grow thin film arrays for practical application presents some interesting challenges at both the nucleation and growth stages, which are discussed briefly.

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