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The effect of grain size on creep crack growth is investigatedby means of a numerical technique in which the actual crack growth process is simulated in a discrete manner by grain elements and grain boundary elements. The grain elements account for the creep deformation of individual grains, while grain boundary cavitation and sliding are accounted for by grain bound- ary elementsbetween the grains. This grain-elementtechniqueallows for an independentstudy of multiple grain size effects: a (direct) size effect related to the specimen size/grain size ratio or an (indirect)effect related to the effect of grain size on nucleation rate and creep resistance. Prelim- inary numerical results are presented concerningthe direct effect of grain size, which predict that the crack growth rate and brittleness increase with grain size.

Numerical simulation of grain-size effects on creep crack growth by means of grain elements