Development of the titanium structure in explosive collapse of thick-walled cylinders

The dependence of the titanium structure on the total deformation in the explosive collapse of thick-walled cylinders is studied. It is shown that structure evolution as a whole and the critical parameters for the appearance of an unstable plastic flow in titanium are not the functions of the final deformation of the cylinders. This instability, which is governed by the internal structure of the material, is the principal mechanism of the loss of the axial symmetry of collapse in the given geometry under specified load conditions. It is found that the instability of the plastic flow in titanium is manifested in the formation of adiabatic-shear bands.