%0 Journal Article
%T The lattice strain ratio in characterizing the grain
%A Bin Gan
%A Fengwei Sun
%A Junhe Lian
%A Qingge Xie
%A Yandong Wang
%J The Journal of Strain Analysis for Engineering Design
%@ 2041-3130
%D 2018
%R 10.1177/0309324718770935
%X A single grain can contract or expand in the transverse direction when it is stretched. It becomes complex when the single grain is embedded in a stretched polycrystal, due to the grain neighborhood effect, which can outweigh the lateral contraction/expansion of that grain itself. Here, we performed numerical simulations to elucidate such grain-to-grain interaction effects on the lattice strain behavior. For individual grains in a polycrystal, pseudo Poisson¡¯s ratio is defined. Ratios of Poisson¡¯s ratio over pseudo Poisson¡¯s ratio were employed to indicate the difference between the cases of the grain deformation with and without the constraint imposed from the neighboring grains. The high-stress spots and the sense of the stress components can be identified with a high possibility according to the proposed ratios. Most of the identified high-stress spots feature tensile stresses in three directions, while some of them feature the compressive stress in one transverse direction and a negative Poisson¡¯s ratio. For the latter, a strong grain-to-grain interaction during the plastic stage of deformation is found. These grains induce the reversal of the lattice strain evolution curve for the measured <002>//TD, which is often found in the literature and in the data of neutron diffraction
%K Pseudo Poisson¡¯s ratio
%K X-ray diffraction
%K lattice strain
%K grain-to-grain interaction
%K neutron diffraction
%U https://journals.sagepub.com/doi/full/10.1177/0309324718770935