scholarly journals Some Studies of Crack Dynamics

2001 ◽  
pp. 3-11
Author(s):  
James R. Rice
Keyword(s):  
Crack Dynamics

Deformation rates effects in softwoods: Crack dynamics with lattice fracture modelling

2009 ◽  
Vol 76 (9) ◽  
pp. 1231-1246 ◽  
Author(s):  
Svetlana Vasić ◽  
Ario Ceccotti ◽  
Ian Smith ◽  
Jakub Sandak
Keyword(s):  
Crack Dynamics

Threshold crack speed in dynamic fracture of silicon

2006 ◽  
Vol 978 ◽  
Author(s):  
Markus J. Buehler ◽  
Harvey Tang ◽  
Adri C.T. van Duin ◽  
William A. Goddard
Keyword(s):  
Force Field ◽  
Orientation Dependence ◽  
Qualitative Behavior ◽  
Crack Speed ◽  
Slow Increase ◽  
Double Ring ◽  
Fracture Dynamics ◽  
Crack Dynamics ◽  
Reaxff Reactive Force Field ◽  
Dynamic Cracking

AbstractWe report a study of dynamic cracking of a silicon single crystal in which the ReaxFF reactive force field is used for about 3,000 atoms near the crack tip while the other 100,000 atoms of the model system are described with a simple nonreactive force field. The ReaxFF is completely derived from quantum mechanical calculations of simple silicon systems without any empirical parameters. This model has been successfully used to study crack dynamics in silicon, capable of reproducing key experimental results such as orientation dependence of crack dynamics (Buehler et al., Phys. Rev. Lett., 2006). Here we focus on crack speeds as a function of loading and crack propagation mechanisms. We find that the steady state crack speed does not increase continuously with applied load, but instead jumps to a finite value immediately after the critical load, followed by a regime of slow increase. Our results quantitatively reproduce experimental observations of crack speeds during fracture in silicon along the (111) planes, confirming the existence of lattice trapping effects. We find that the underlying reason for this behavior is formation of a 5-7-double ring defect at the tip of the crack, effectively hindering nucleation of the crack at the Griffith load. We develop a simple continuum model that explains the qualitative behavior of the fracture dynamics.

Mesh8Modal analysis of stainless steel cantilever beam crack dynamics using finite element method

2020 ◽  
Vol 21 ◽  
pp. 690-693
Author(s):  
S. Arun Kumar ◽  
V. Velmurugan ◽  
V. Paramasivam ◽  
S. Thanikaikarasan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stainless Steel ◽  
Cantilever Beam ◽  
Crack Dynamics ◽  
Element Method

Crack dynamics and crack surfaces in elastic beam lattices

1998 ◽  
Vol 57 (2) ◽  
pp. R1259-R1262 ◽  
Author(s):  
Jan Åström ◽  
Mikko Alava ◽  
Jussi Timonen
Keyword(s):  
Elastic Beam ◽  
Crack Dynamics

Studies of crack dynamics in clay soil

Geoderma ◽  
2005 ◽  
Vol 125 (3-4) ◽  
pp. 203-211 ◽  
Author(s):  
H.-J. Vogel ◽  
H. Hoffmann ◽  
K. Roth
Keyword(s):  
Clay Soil ◽  
Crack Dynamics

Crack Dynamics and Grain Size

1994 ◽  
Vol 362 ◽  
Author(s):  
John J. Gilman
Keyword(s):  
Grain Size ◽  
Kinetic Energy ◽  
Sound Speed ◽  
Maximum Stress ◽  
Size Dependence ◽  
Terminal Velocity ◽  
Moving Crack ◽  
Fine Grained ◽  
Crack Dynamics ◽  
Relative Kinetic

AbstractTwo aspects of fast cracks are considered: 1. the terminal velocity, and corresponding relative kinetic energy; 2. the grain size dependence of the fracture. It is argued that this is determined by the kinetic energies of cracks when they have expanded enough to reach the boundaries of the grains in which they lie. This is more consistent with the observed facts than the more usual quasi-static models.By considering the limiting conditions at the very tip of a moving crack, many complications are avoided in calculating the terminal velocity. The maximum transverse acceleration of material is limited by the maximum stress (cohesive) that can be applied. The resulting terminal velocity is: 0.4 vs, where vs is the longitudinal sound speed; compared with measured values which average about: 0.31 vs.In polycrystals, microcracks are found when the applied stress exceeds the yield stress. However, the microcracks do not propagate in fine-grained specimens because they do not have enough kinetic energy to cross a typical grain boundary. This leads to the observed dependence of the fracture stress on the grain size.

scholarly journals Evaluation of Errors in the Numerical Simulation of Crack Dynamics with a BIEM

2005 ◽  
Vol 58 (1) ◽  
pp. 77-81
Author(s):  
Noriyuki KATSUMATA ◽  
Ryosuke ANDO ◽  
Taku TADA ◽  
Yuzo SHINOZAKI
Keyword(s):  
Numerical Simulation ◽  
Crack Dynamics
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