scholarly journals Dislocation nucleation and emission from crack tip

1995 ◽  
Vol 69 (4) ◽  
pp. 295-306 ◽  
Author(s):  
T. C. Wang
Keyword(s):  
Crack Tip ◽  
Dislocation Nucleation

Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron

2006 ◽  
Vol 21 (10) ◽  
pp. 2542-2549 ◽  
Author(s):  
Li-Xia Cao ◽  
Chong-Yu Wang
Keyword(s):  
Low Temperatures ◽  
Crack Tip ◽  
Dislocation Nucleation ◽  
Effect Of Temperature ◽  
Body Centered Cubic ◽  
Partial Dislocations ◽  
Higher Temperature ◽  
Crack Blunting ◽  
Increasing Temperature ◽  
Extended Dislocation

The molecular dynamics method has been used to simulate mode I cracking in body-centered-cubic iron. Close attention has been paid to the process of the atomic configuration evolution of the cracks. The simulation shows that at low temperatures, partial dislocations are emitted before the initiation of crack propagation, subsequently forming the stacking faults or multilayer twins on {112} planes, and then brittle cleavage and extended dislocation nucleation are observed at the crack tip accompanied by twin extension. These results are in agreement with the experimental observation that twinning and fracture processes cooperate at low temperatures. Furthermore, an energetics analysis has been made on the deformation behavior observed at the crack tip. The effect of temperature on the fracture process is discussed. At the higher temperature, plastic deformation becomes easier, and crack blunting occurs. With increasing temperature, the fracture resistance increases, and the effect of the lattice trapping can be weakened by thermal activation.

Crack Tip Dislocation Nucleation in FCC Solids

1999 ◽  
Vol 82 (8) ◽  
pp. 1700-1703 ◽  
Author(s):  
J. Knap ◽  
K. Sieradzki
Keyword(s):  
Crack Tip ◽  
Dislocation Nucleation

Atomistic Study of Hydrogen Effect on Dislocation Nucleation at Crack Tip

2013 ◽  
Vol 15 (11) ◽  
pp. 1146-1151 ◽  
Author(s):  
Mao Wen ◽  
Zhiyuan Li ◽  
Afrooz Barnoush
Keyword(s):  
Crack Tip ◽  
Dislocation Nucleation ◽  
Hydrogen Effect ◽  
Atomistic Study
Sign in / Sign up

Export Citation Format

Share Document