Dynamic simulations of the interaction between dislocations and dilute particle concentrations in metal–matrix composites (MMCs)

Combined effects of void shape and void size ? oblate spheroidal microvoid embedded in infinite non-linear solid

“…This size strengthening effect is believed to come from the proliferation of geometrically necessary dislocations induced by the inhomogeneous plastic deformation (Nye, 1953;Ashby, 1970). Recent dislocation simulations displayed that the size effect is inherent for the plastic deformation at the micron or sub-micron (Cleveringa et al, 1997(Cleveringa et al, , 2000Khraish et al (2004);Needleman, 2000;Ohashi, 2004).…”

Stress-Strain Interaction Model of Plasticity

“…The rearrangements of the internal structures within which the particles are being collectively dislocated to new positions of internal equilibrium are frequently explicated in discrete dislocation physics as interactions, e.g. [12] [13] [14] [15] [16]. Simulation methods based on dislocation physics and using finite element analysis, e.g.…”

Dislocation pinning effects induced by nano-precipitates during warm laser shock peening: Dislocation dynamic simulation and experiments

“…V C 2011 American Institute of Physics 110, 023518-1 dislocation behaviors at the matrix-precipitate interface by proposing a back force model associated with the anti-phase boundary energy. Khraishi et al 23,25 reported a fundamental understanding of the particle strengthening in metal-matrix composites with a particle size of around 1000b and the hardening effect of a spatial distribution of defect clusters with a radius of 2b to 10b. However, the dislocation evolution and strengthening effect predicted by these studies have not been compared with experimental results.…”

“…To investigate the interaction of dislocation and precipitatation, not only transmission electron microscopy [12][13][14][15] (TEM) but also several simulation methods have been utilized, such as molecular dynamic (MD) simulation, [16][17][18][19][20] Monte Carlo (MC) simulation, 21,22 and dislocation dynamic (DD) simulation. 9,[23][24][25] Both MD and MC simulations are usually restricted by the limited size (nanoscale) and the short duration (picoseconds) due to the prohibitive computational cost, whereas DD simulation can be applied for much larger sizes (more than 10000b, with b being the Burgers vector) and longer times (more than 100 ns). Therefore, DD simulation is more suitable for investigating the effects of the highly diffused nanoscale precipitate cluster on dislocation behaviors.…”