Summary
It is shown that the Orowan-type kinematic relations as well as the Schmid yield criterion can be derived basing oneself on a formula defining the mean curvature of glide surfaces for a principal congruence of edge dislocation lines accompanied with a particular distribution of secondary point defects. Moreover, it appears that this mean curvature has the physical meaning of a mesoscopic material parameter defining a relation between the evolution of the dislocation state and plastic deformation. It is pointed out that the existence of Orowan-type relations puts kinematic constraints, dependent on the isometry group of glide surfaces, on the dislocation density tensor.
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Trzęsowski, A. On the geometric origin of Orowan-type kinematic relations and the Schmid yield criterion. Acta Mechanica 141, 173–192 (2000). https://doi.org/10.1007/BF01268676
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DOI: https://doi.org/10.1007/BF01268676