ABSTRACT
In a polycrystalline metal, individual grains are not subjected to a uniaxial stress system even when the specimen is subjected to a uniform tension [1]. These experiments investigated the deformations on the tensile surface of a polycrystalline titanium specimen in bending. Heterogeneous normal strains within grains were documented, together with a heterogeneous distribution of shear strains near grain boundaries. Heterogeneous distributions were observed at 57% of the yield point strain. The results corroborate earlier observations [2,3] and reveal the behaviour in greater detail. Microscopic moiré interferometry was employed for the study. Its high sensitivity and spatial resolution provided a faithful account of the in-plane displacement field.
