Abstract
A plasticity theory is summarized for a powdered metal compact. The constitutive equation is applied to the variational principle and its discretization is developed. The discretized formulation has been implemented into the finite element code and the program has been tested and applied to simulations of axisymmetric die pressings with copper powders. The simulation includes single-action and double-action pressings of solid cylinders as well as cylindrical rings. Predictions are made for density distributions, mean stress distributions, load-stroke relationships, average density as function of height, average density as function of radius, pressure distributions along die-walls and punches, and force fraction transmitted to the stationary punch. Some of the predicted solutions are compared with experimental observations from the literature. It was found that the results from the finite element analysis, in general, agree very well with the experimental observations.
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