Analysis by variational methods of the stress-strain state of an axisymmetric porous solid undergoing densification

Conclusions An analysis is made, using the direct variational method, of the problem on the repressing of a porous cylindrical blank in a rigid die. Analysis of the results of calculations shows that in the first stage of densification density differences appear and grow inside the blank. In the second stage of the process the density differences diminish and finally completely disappear after the blank reaches a virtually nonporous state. The instantaneous power of deformation grows with decreasing initial blank porosity at identical absolute strains and also with increasing degree of deformation, and in the limit tends to infinity at _m 0. The power of deformation of blanks of larger initial height can be either greater or smaller than the power of deformation of blanks of smaller H ₀ ^* (at any given ₀), depending of H.Deceased.Translated from Poroshkovaya Metallurgiya, No. 10(286), pp. 26–30, October, 1986.