Criteria for Nucleation of a Dislocation and a Cleavage Crack in a Nickel Single Crystal Based on Molecular Dynamics

1998 ◽  
pp. 120-130 ◽  
Author(s):  
Takayuki Kitamura ◽  
Kisaragi Yashiro ◽  
Ryuichi Ohtani
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Cleavage Crack ◽  
Nickel Single Crystal

Molecular dynamics study of Hugoniot relation in shocked nickel single crystal

2018 ◽  
Vol 32 (7) ◽  
pp. 3273-3281 ◽  
Author(s):  
Jimin Choi ◽  
Sanghyuk Yoo ◽  
Soonho Song ◽  
Jung Su Park ◽  
Keonwook Kang
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Hugoniot Relation ◽  
Nickel Single Crystal

Formation of excess atomic volume and its role in the processes of fracture of nickel single crystal

2021 ◽  
pp. 24-29
Author(s):  
D.S. Kryzhevich ◽  
◽  
A.V. Korchuganov ◽  
K.P. Zolnikov ◽  
◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Crack Propagation ◽  
Single Crystal ◽  
High Speed ◽  
Room Temperature ◽  
Atomic Volume ◽  
Dynamics Simulation ◽  
Crack Propagation Velocity ◽  
Nickel Single Crystal

Molecular dynamics simulation of crack propagation peculiarities in a nickel single crystal under uniaxial tension along the cubic direction was carried out. It was found that at room temperature regions with excess atomic volume are formed near the tips of the opening crack. Subsequently nanopores are formed in these areas which then merge with the crack stimulating high-speed opening. It is shown that if dislocations begin to form at the crack tip in a region with an increased atomic volume the crack propagation velocity in this direction significantly decreases.

A reactive molecular dynamics study on the anisotropic sensitivity in single crystal α-cyclotetramethylene tetranitramine

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8609-8621 ◽  
Author(s):  
Ting-Ting Zhou ◽  
Yan-Geng Zhang ◽  
Jian-Feng Lou ◽  
Hua-Jie Song ◽  
Feng-Lei Huang
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Shock Compression ◽  
Slip Plane ◽  
Reactive Molecular Dynamics ◽  
Cyclotetramethylene Tetranitramine

Anisotropic sensitivity is related to the different intermolecular steric arrangements across the slip plane induced by shock compression along various orientations.

scholarly journals Plain and notched fatigue in nickel single crystal alloys

2009 ◽  
Vol 31 (11-12) ◽  
pp. 1709-1718 ◽  
Author(s):  
W.J. Evans ◽  
R. Lancaster ◽  
A. Steele ◽  
M. Whittaker ◽  
N. Jones
Keyword(s):  
Single Crystal ◽  
Nickel Single Crystal

scholarly journals Molecular Dynamics Simulation of Crack Propagation in Single-Crystal Aluminum Plate with Central Cracks

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Jun Ding ◽  
Lu-sheng Wang ◽  
Kun Song ◽  
Bo Liu ◽  
Xia Huang
Keyword(s):  
Molecular Dynamics ◽  
Plastic Deformation ◽  
Crack Propagation ◽  
Strain Rate ◽  
Single Crystal ◽  
Crack Length ◽  
Crack Growth ◽  
Plastic Yield ◽  
Model Size ◽  
Dislocation Multiplication

The crack propagation process in single-crystal aluminum plate (SCAP) with central cracks under tensile load was simulated by molecular dynamics method. Further, the effects of model size, crack length, temperature, and strain rate on strength of SCAP and crack growth were comprehensively investigated. The results showed that, with the increase of the model size, crack length, and strain rate, the plastic yield point of SCAP occurred in advance, the limit stress of plastic yield decreased, and the plastic deformability of material increased, but the temperature had less effect and sensitivity on the strength and crack propagation of SCAP. The model size affected the plastic deformation and crack growth of the material. Specifically, at small scale, the plastic deformation and crack propagation in SCAP are mainly affected through dislocation multiplication and slip. However, the plastic deformation and crack propagation are obviously affected by dislocation multiplication and twinning in larger scale.

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