Dislocation Movement at Crack Tip of Single Crystals of Ice

1991 ◽  
pp. 62-73 ◽  
Author(s):  
Yingchang Wei ◽  
John P. Dempsey
Keyword(s):  
Single Crystals ◽  
Crack Tip ◽  
Dislocation Movement

An I-integral method for crack-tip intensity factor variation due to domain switching in ferroelectric single-crystals

2016 ◽  
Vol 94 ◽  
pp. 207-229 ◽  
Author(s):  
Hongjun Yu ◽  
Jie Wang ◽  
Takahiro Shimada ◽  
Huaping Wu ◽  
Linzhi Wu ◽  
...  
Keyword(s):  
Intensity Factor ◽  
Single Crystals ◽  
Integral Method ◽  
Domain Switching ◽  
Crack Tip

scholarly journals Discrete dislocation plasticity and crack tip fields in single crystals

2001 ◽  
Vol 49 (9) ◽  
pp. 2133-2153 ◽  
Author(s):  
E. Van der Giessen ◽  
V.S. Deshpande ◽  
H.H.M. Cleveringa ◽  
A. Needleman
Keyword(s):  
Single Crystals ◽  
Crack Tip ◽  
Crack Tip Fields ◽  
Discrete Dislocation ◽  
Dislocation Plasticity

Crack tip deformation in LiF single crystals

1984 ◽  
Vol 18 (5) ◽  
pp. 467-472 ◽  
Author(s):  
K.Y. Chia ◽  
S.J. Burns
Keyword(s):  
Single Crystals ◽  
Crack Tip

scholarly journals The Early Stage of Dislocation Process around a Crack Tip Observed by HVEM-Tomography in Silicon Single Crystals

2011 ◽  
Vol 52 (3) ◽  
pp. 352-357 ◽  
Author(s):  
Masaki Tanaka ◽  
Sunao Sadamatsu ◽  
Hiroto Nakamura ◽  
Kenji Higashida
Keyword(s):  
Single Crystals ◽  
Early Stage ◽  
Crack Tip ◽  
Dislocation Process

Crack-Tip Deformation Mechanisms in α-Fe and Binary Fe Alloys: An Atomistic Study on Single Crystals

2007 ◽  
Vol 38 (13) ◽  
pp. 2191-2202 ◽  
Author(s):  
Peter A. Gordon ◽  
T. Neeraj ◽  
Michael J. Luton ◽  
Diana Farkas
Keyword(s):  
Single Crystals ◽  
Crack Tip ◽  
Deformation Mechanisms ◽  
Fe Alloys ◽  
Atomistic Study

scholarly journals Direct atomistic simulation of brittle-to-ductile transition in silicon single crystals

2010 ◽  
Vol 1272 ◽  
Author(s):  
Dipanjan Sen ◽  
Alan Cohen ◽  
Aidan P. Thompson ◽  
Adri Van Duin ◽  
William A. Goddard III ◽  
...  
Keyword(s):  
Single Crystals ◽  
Atomistic Simulation ◽  
Large Scale ◽  
Elevated Temperatures ◽  
Experimental Studies ◽  
Crack Tip ◽  
Threshold Value ◽  
Atomic Scale ◽  
Brittle To Ductile Transition ◽  
First Time

AbstractSilicon is an important material not only for semiconductor applications, but also for the development of novel bioinspired and biomimicking materials and structures or drug delivery systems in the context of nanomedicine. For these applications, a thorough understanding of the fracture behavior of the material is critical. In this paper we address this issue by investigating a fundamental issue of the mechanical properties of silicon, its behavior under extreme mechanical loading. Earlier experimental work has shown that at low temperatures, silicon is a brittle material that fractures catastrophically like glass once the applied load exceeds a threshold value. At elevated temperatures, however, the behavior of silicon is ductile. This brittle-to-ductile transition (BDT) has been observed in many experimental studies of single crystals of silicon. However, the mechanisms that lead to this change in behavior remain questionable, and the atomic-scale phenomena are unknown. Here we report for the first time the direct atomistic simulation of the nucleation of dislocations from a crack tip in silicon only due to an increase of the temperature, using large-scale atomistic simulation with the first principles based ReaxFF force field. By raising the temperature in a computational experiment with otherwise identical boundary conditions, we show that the material response changes from brittle cracking to emission of a dislocation at the crack tip, representing evidence for a potential mechanisms of dislocation mediated ductility in silicon.

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