Abstract:
One of the urgent problems in the field of materials science is producing of metals and alloys
with an ultrafine-grained (UFG) structure. Metals with UFG structure are characterized by
improved physical and mechanical properties, such as increased strength, cold brittleness, and
radiation stability. This paper considers a method of dynamic channel-angular pressing (DCAP)
which is used to obtain the UFG structure. The purpose of this work is to simulate numerically the
DCAP process of a copper sample using experimental data of loading. The experimental data
available in the scientific literature have been analyzed to specify the initial conditions as follows:
the pressure acting on the rear part of the sample is $P_0=310$ MPa and the initial velocity of the
sample can be varied in a wide range. Numerical simulation is performed using a modified finite
element method within the framework of elastoplastic model of a damaged medium. The
numerical computations have shown that the copper sample successfully undergoes the DCAP
process at the following initial parameters: $v_0 = 170$ m/s and $P_0 = 310$ MPa. Almost the entire
sample is exposed to uniform intense plastic deformations, except for the front and rear parts.
Also, a slight elongation of the sample occurs along the longitudinal axis, and the temperature
rises up to $600$ K in the contact region of the sample with the walls of the horizontal part of the
channel.
Keywords:severe plastic deformation, dynamic channel-angular pressing, finite element method.