Abstract
The bulging shape and the volume change occurring during the simple compression of porous metal under the action of friction, which provide useful guidelines for preform design in powder forging, are quantified for various working conditions (different friction, initial density and specimen shape) by using plasticity theory for porous metal. The upper-bound method is used to analyze the situation by assuming that the radial velocity distribution along the specimen axis is parabolic and that the necessary parameters are determined by the minimum energy condition. The fracture limit in porous metals is also discussed, in terms of the results of this study.
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