Dislocation patterning: From micro- to mesoscale description

During the plastic deformation of crystalline material the dislocations, be ing the carriers of the plastic flow, tend to form different patterns. Beca use of the long range nature of dislocation-dislocation interaction, the or igin of this self-ordering phenomenon is still an open question. The paper presents a stochastic two-dimensional model derived directly from the prope rties of individual dislocations making it possible to investigate the prob lem on a mesoscale. Numerical results obtained in double slip configuration indicate the development of cell structure with fractal character.