Abstract
On the basis of plasticity theory for porous metal, an analysis of ring compression has been carried out, employing the upper-bound approach. The plastic flowability and the neutral radius of the porous metal ring have been calculated and the deformation characteristics of the powder forging then obtained from these results. Ring-compression experiments have been carried out on sintered-iron porous metal of various relative densities under various friction conditions: good agreement is observed between the calculated curves and the experimental results from the tests. It is demonstrated that the friction factor for powder-metal forming can be determined not only from the relationship between reduction in height and reduction in internal diameter, but also independently from the relationship between reduction in height and relative density, if the initial relative density is known.
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