The influence of grain boundary geometry on intergranular crack propagation in Ni3Al

1993 ◽  
Vol 41 (2) ◽  
pp. 553-562 ◽  
Author(s):  
Hui Lin ◽  
D.P. Pope
Keyword(s):  
Grain Boundary ◽  
Crack Propagation ◽  
Intergranular Crack ◽  
Boundary Geometry

Molecular dynamics simulation of crack propagation behaviors at the Ni/Ni3Al grain boundary

RSC Advances ◽  
2014 ◽  
Vol 4 (62) ◽  
pp. 32749 ◽  
Author(s):  
Jingui Yu ◽  
Qiaoxin Zhang ◽  
Rong Liu ◽  
Zhufeng Yue ◽  
Mingkai Tang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Grain Boundary ◽  
Crack Propagation ◽  
Dynamics Simulation

Investigation to the Effects of Grain Misorientation on the Performance of Short Cracks

2007 ◽  
Vol 353-358 ◽  
pp. 1165-1168
Author(s):  
Yan Hai Xu ◽  
Hao Li ◽  
Li Guo
Keyword(s):  
Grain Boundary ◽  
Crack Propagation ◽  
Geometric Parameters ◽  
Short Crack ◽  
Short Cracks ◽  
Grain Orientations ◽  
Grain Misorientation

The influences of crystallographic and geometric parameters such as grain misorientation on the performance of short cracks are illustrated based on FEM in this paper. Firstly, the microstructure is simulated to account for the effects of grain misorientation on the performance of short cracks and the short cracks are initiated within the microstructure for the further investigation. The influence of grain misorientation is demonstrated by the change of neighboring grain orientations with an initiated short crack from 0° to 180°. The effects of the grain boundary on the short crack with the crack arrested or retarded are described by the crack propagation until it approached the grain boundary. The results will give more useful information such as crack arrested and retardation to the further research on the characteristics and evolution of short cracks.

A Markov Chain Fracture Model for Intergranular Crack Propagation in Polycrystalline Materials

2010 ◽  
Vol 89-91 ◽  
pp. 29-34
Author(s):  
Muhammad A. Arafin ◽  
Jerzy A. Szpunar
Keyword(s):  
Monte Carlo ◽  
Markov Chain ◽  
Crack Propagation ◽  
Intergranular Crack ◽  
Crack Nucleation ◽  
External Stress ◽  
Polycrystalline Materials ◽  
Multiple Crack ◽  
Stress Direction ◽  
Nucleation Sites

A model for intergranular damage propagation in polycrystalline materials is proposed, based on Markov Chain theory, Monte Carlo simulation and percolation concept. The model takes into account crack branching and coalescence, multiple crack nucleation sites, crack-turning etc., as well as the effect of grain boundary plane orientations with respect to the external stress direction. Both honeycomb and voronoi microstructures were utilized as the input microstructures. The effect of multiple crack nucleation sites has been found to have great influence on the crack propagation length. It has been observed that percolation threshold reported in the literature based on hexagonal microstructure is not applicable when the effect of external stress direction on the susceptibilities of grain boundaries is considered. The successful integration of voronoi algorithm with the Markov Chain and Monte Carlo simulations has opened up the possibilities of evaluating the intergranular crack propagation behaviour in a realistic manner.

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