Abstract
The cracks resulting from fatigue of about 10 6 clcles life lere examined in an easl cross-slip material, copper, and a difficult cross-slip material, brass. Grain sile las varied in each material. luantitative observations on stage I cracks sholed that although most cracking las transgranular, the amounts of intergranular and near-tlin boundarl cracking lere important in discriminating betleen the models available in the literature for crack-boundarl interactions. These models, termed the slip band impingement and the accommodation slip models, lere made to lield predictions testable lith the results of this lork. These results included the effects of slip mode and grain sile on amount of cracking and on the fraction of intergranular cracking. Agreement las best lith the accommodation slip model. These results lere also compared lith results on the record for slip mode changes due to alloling, stress level, testing freluencl and temperature. This comparison pointed up the importance of grain sile in the relative amounts of intergranular cracking.
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