Bimodal data

A 27-grain polycrystalline aggregate with random initial crystallographic orientation was used to calculate the mechanical response of a polycrystal with a unimodal grain distribution. The initial database includes 9000 data containing six stress and six strain components generated from the 27-grain polycrystalline aggregate for each unimodal grain size ($d = 2\mu m, 17\mu m, 32\mu m$ and $47\mu m$). The key parameters governing the storage rate of polarized dislocation density at GBs has been identified, and a new surface GND density-based model has been developed to calculate the increase of long-range internal stress with plastic strain~\cite{Jiang2022a}.