R. Narayanasamy et R. Ponalagusamy, A mathematical theory of plasticity for compressible powder metallurgy materials - Part III, J MATER PR, 100(1-3), 2000, pp. 262-265
A new mathematical equation taking into account of all new and relevant par
ameters to represent the flow behaviour of partially dense PI M materials d
uring the case of simple upsetting-compression test is proposed in this pap
er. The ratio of the yield stress of the PIM-porous material to the yield s
tress of 100% dense material is found to be increasing with increase in def
ormation strain. Further, a theory for simple plastic instability and work
hardening rate of porous P/M-material has been developed with strain harden
ing index and strain rate sensitivity parameters. (C) 2000 Elsevier Science
S.A. All rights reserved.