Numerical simulation of dynamic channel-angular pressing of titanium specimens

At present, volume nanostructural and ultrafine-grained materials are considered as promising constructional and functional materials of new generation. Investigation of ultrafine-grained metals received by severe plastic deformation methods showed that they are characterized by a number of unique properties as compared to coarse-grained analogues: raised several times strength combined with good plasticity, low- and high-temperature superplasticity, cyclic and radiating resistance. Recently, a new method of severe plastic deformation was proposed — dynamic channel-angular pressing (DCAP), in which pressing of a specimen through channels is carried out by pulse loading at the expense of energy of compressed gases. In this work, deformation of a titanium specimen during DCAP was numerically investigated in a 3D statement for the dynamic scheme of loading. Computations have been carried out by the finite element method within the framework of the elastic-plastic medium model with allowance for fracture. The effective values of initial velocity and loading pressure are determined for a titanium specimen.