Regular hot-powder compression regime

Interest in the problem of axial unilateral compression of a viscous porous material has been generated both by the development of the technology of hot pressforming methods and the study of high-temperature rheology in powder materials. We propose a new analytical solution for the problem familiar from the theory of hot compression in connection with the axial unilateral compression of a viscous porous material in a cylindrical mold. It is demonstrated that the fundamental operational characteristic of the process, i.e., the relationship between the speed of the piston and the applied force for fixed instants of time is nonmonotonic in nature, which is a result of the competition between the effect of the load factors and the volumetric viscosity that is dependent on density.