Eric R. Homer¹, David E Page¹, Devin W Adams¹, Ricky Wyman¹, David T Fullwood¹, Robert H Wagoner²; ¹Brigham Young University, ²Ohio State University

Grain boundary-dislocation interactions play a crucial role in the deformation behavior of polycrystalline materials. While it is well known that grain boundaries can respond in a variety of ways to imposed deformation, the criteria for each response is not well known. We present work focused on determining the criteria for nucleation of dislocations from a grain boundary as well as efforts to determine the criteria for transmission of dislocations through a grain boundary. The nucleation simulations of a single grain boundary find unique criteria for every slip system, which include non-Schmid effects. The transmission simulations sample a larger population of grain boundaries and find more variation in the observed geometric criteria and resolved shear stresses. We also detail efforts to work beyond the limitations of our current approaches.