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Different compaction processes of the nanosized granular system, which is aprototype of an alumina nanopowder, are studied by the granular dynamicsmethod. For all processes: compaction curves ''density vs. pressure'' of thepowder compact are calculated, the elastic and the plastic parts are extractedfrom the total deformation, the body elastic moduli are determined within theisotropic solid approximation. The inadequacy of the isotropy approximation isestablished. The nanopowder yield surface is constructed in the space of stresstensor invariants. The inapplicability of the traditional associated flow rulefor description of oxide nanopowders compaction processes is revealed. Analternative flow rule is suggested.

Elastic Properties, Yield Surface and Flow Rule of Nanopowder Compacts