Dislocation nucleation from a crack tip: a formulation based on anisotropic elasticity. J. Mech. Phys. Solids 42, 1905-1932.Y. Sun, G. E. Beltz, Dislocation nucleation from a crack tip: A formulation based on a
Dislocation nucleation from a crack tip underlies the mechanism of brittle vs. ductile transition (Armstrong, 1966; Kelly et al., 1967; Rice and Thomson, 1974; Ashby and Embury, 1985; Chiao and Clarke, 1989; Hirsch and Roberts, 1991). In a pioneering work for the competition between cleavag...
dislocation nucleation from a crack tip : a formulation based on anisotropic elasticity Dislocation nucleation from a stressed crack tip is analyzed based on the Peierls concept, in which a periodic relation between shear stress and atomic shear displacement is assumed to hold along a slip plane ema...
These dislocation-related structures represent various modes of deformation along specific deformation directions corresponding to the slip systems of the target ceramics, thereby closely aligning with their dislocation properties. In uniformly deformed structures, all crystal cell layers are displaced uniformly...
The elastic-to-plastic transition during the deformation of a dislocation-free nanoscale volume is accompanied by displacement bursts associated with dislocation nucleation. The dislocations that nucleate during the so-called “pop-in” burst take the form of prismatic dislocation loops (PDLs) and exhib...
The dislocation mobility law used was physically based on double-kink nucleation on screw dislocations, with an activation energy reduced by the local stress. Even in the strong stress gradients near a crack-tip, the dislocations are found to self-organise so that the internal stress in the ...
providing a robust foundation for atomistic simulations of dislocation plasticity in wurtzite ZnO and GaN using these NNPs, given that the SFE is a fundamental property for dislocation nucleation and slip61,62. The empirical potentials considerably overestimate the SFE (see Figs.5c, d). For instanc...
Dislocation emission from the crack tip,formation of dislocation-free zones,nucleation of nano-cracks and dislocation pile-ups were all observed. 进行了1Cr18Ni9Ti(奥氏体321型不锈钢)的TEM原位拉伸实验,观察到了位错从裂纹尖端的发射、无位错区形成、纳米裂纹形核及位错塞积等物理现象。3) dislocation free ...
Dislocation emission from the crack tip,formation of dislocation-free zones,nucleation of nano-cracks and dislocation pile-ups were all observed. 进行了1Cr18Ni9Ti(奥氏体321型不锈钢)的TEM原位拉伸实验,观察到了位错从裂纹尖端的发射、无位错区形成、纳米裂纹形核及位错塞积等物理现象。3...
[140], in particular, suggested that dislocation nucleation and propagation are insufficient to relieve the stress concentration at the crack tip, resulting in the brittle behavior of silicon. Several attempts to calculate the Peierls stress have been performed using both semiempirical potentials [141]...