Research of the influence of crystallographic texture on the forming limit curves of blanks

In technological calculations of the forming processes of parts of aircraft, engines and other mechanical engineering products, the relations of the plasticity theory based on the phenomenological approach and the hypothesis of a continuous (structureless) medium, which does not include crystallographic texture parameters and crystal lattice constants, are still used. Consequently, there is no basis for a direct analysis of the formability of textured materials in specific technological operations, and most importantly, for the calculation and design of texture components effective for forming performance. The article provides a theoretical calculation of the forming limit curves (FLС) based on the modified maximum force of P. Hora and the yield criteria, which explicitly takes into account the lattice constants and orientation factors of the texture. Using the obtained model for the basic ideal crystallographic orientations characteristic for materials with a cubic crystal lattice, the forming limit curves of ultimate strains are plotted.