Effect of CRSS ratio on heterogeneous deformation behavior of commercially pure titanium oligocrystal

Abstract

In recent years, direct comparisons between simulations and experiments dedicated to test samples containing a small number of grains (oligocrystals) instrumented using full field measurements techniques (DIC, grid method) have proved fruitful to investigate and accurately reproduce the behavior of BCC and FCC crystals. The extension of this approach to hcp metals and CP-Ti in particular is the objective of the present work. In particular, the influence of CRSSs ratios in a grade 2 CP-Ti sheet is investigated numerically, by comparing the predictions of strain field in a 32 grains oligocrystal loaded in tension with experimental results. It is found that the set of constitutive parameters identified by the authors in a previous study [Hama et al., Int. J. Plast., 2017(91), 77] reflects the experimental behavior satisfactorily for strain fields.