Computer simulation of effect of grain size distribution on Weibull parameters

Computer simulation of crack nucleation associated with unstable equilibriu m in polycrystal consisting of grains of random sizes and orientations are presented. Micro-stress and micro-strain fluctuations were taken into accou nt. Distribution functions for probability of fracture for different parame ters of grain structure were obtained. It is shown that these functions may be approximated by three-parameter Weibull distribution with high accuracy . Ascertained are the dependencies of Weibull parameters on both grain size s and their variance. (C) 2001 Elsevier Science Ltd. All rights reserved.