Molecular Dynamics Simulations on Local Lattice Instability at Mode I Crack Tip in BCC Iron

2015 ◽  
pp. 557-570 ◽  
Author(s):  
Kisaragi Yashiro ◽  
Yuta Tsugawa ◽  
Hiroshi Katayama
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Crack Tip ◽  
Mode I ◽  
Mode I Crack ◽  
Lattice Instability ◽  
Bcc Iron ◽  
Local Lattice ◽  
Dynamics Simulations

Isotropic Md Simulations Of Dynamic Brittle Fracture

1995 ◽  
Vol 409 ◽  
Author(s):  
Pep Español ◽  
Miguel A. Rubio ◽  
Ignacio Zúñiga
Keyword(s):  
Molecular Dynamics ◽  
Brittle Fracture ◽  
Molecular Dynamics Simulations ◽  
Crack Tip ◽  
Md Simulations ◽  
Initial Crack ◽  
Mode I ◽  
Wave Speeds ◽  
Dynamics Simulations ◽  
Dynamic Brittle Fracture

AbstractWe present results obtained by molecular dynamics simulations on the propagation of fast cracks in triangular 2D lattices. Our aim is to simulate Mode I fracture of brittle isotropic materials. We propose a force law that respects the isotropy of the material. The code yields the correct imposed sound c║, shear c┴ and surface VR wave speeds. Different notch lengths are systematically studied. We observe that initially the cracks are linear and always branch at a particular critical velocity c* ≈0.8VR and that this occurs when the crack tip reaches the position of a front emitted from the initial crack tip and propagating at a speed c = 0.6 8VR.

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