As applied to the problem of dislocation nucleation, nanofracture mechanics suggested earlier by the author advances a simpler and more powerful alternative to the Rice-Thomson approach. This alternative is briefly described in the present paper. It is shown that the predictions of nanofracture mechanics differ many times from those of the Rice-Thomson approach. Nanofracture mechanics allows one to approach to the problems with many dislocations (which cannot be solved by the Rice-Thomson approach). Some results on the screw and tear mode crack growth with the generation of many dislocations are brought in the paper. The known ideal plasticity and brittle fracture mechanics solutions are found to follow from the nanofracture mechanics as some limiting cases.