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Isotropic Constitutive Model for Sintering Particle Packings
Author(s) -
Jagota Anand,
Mikeska Kurt R.,
Bordia Rajendra K.
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb07587.x
Subject(s) - isotropy , materials science , newtonian fluid , viscosity , particle (ecology) , sintering , discrete element method , composite material , mechanics , porosity , physics , oceanography , quantum mechanics , geology
This paper presents an isotropic model for the effective viscosities of sintering particle packings. The relationship between the macroscopic stress and deformation rate is based on the behavior of individual interparticle contacts, represented by contact viscosities, and the statistics of the packing. The contact viscosities depend on the contact area, which is the primary variable used to describe the state of the packing. A direct consequence of this choice of state variable is that the effective viscosities are identically zero for an undeformed and unsintered packing. Specific results are presented for the case of Newtonian viscous materials. The model is compared with existing models for porous Newtonian viscous materials. Experiments conducted with spherical glass powder packings show good agreement with the model. Finite‐element simulations using the model have been used to study forging of a pellet.