Particle morphology is known to have a great influence on the densification behavior of metal powders during the compaction processes. This factor has to be included in the phenomenological constitutive models for a better understanding and modeling the compaction processes of metal powders on the basis of continuum mechanics. In this paper, we propose a new constitutive model to account for the influences of particle morphology on the powder deformation. The model is actually a combination of the quadratic yield function and the Coulomb rule by using a special state variable which includes an index of particle morphology. The characteristics of the model are studies in terms of the yield surface. We also discuss about the functional form of the state variable and the determination of morphology index.
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