13th International Conference on Fracture June 16–21, 2013, Beijing, China -4- accompanying phenomenon. The proposed fracture criterion involves the use of the main terms of the double asymptotics lm H→0, H L→0, where L is the characteristic length of the crack. The consistent application of this double asymptotics leads to the concept of small-scale Cosserat continuum. H lm Flexure crack Figure 1. A volume element of size H loaded by a moment stress causing mutual rotation of neighbouring particles. The latter causes flexure (tensile) microcrack at scale lm<<H.
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