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Effects of microstructure on the compressive yield stress
Author(s) -
Channell Glenn M.,
Miller Kelly T.,
Zukoski Charles F.
Publication year - 2000
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690460110
Subject(s) - suspension (topology) , dilution , microstructure , materials science , volume fraction , compressive strength , yield (engineering) , mixing (physics) , composite material , volume (thermodynamics) , thermodynamics , mathematics , physics , quantum mechanics , homotopy , pure mathematics
The effects of microstructure on the compressive properties of aggregated alumina suspensions are determined by intentionally introducing heterogeneities into the suspension. Suspensions are prepared at a high volume fraction and diluted with low shear hand mixing to a series of initial concentrations. As the initial concentration is increased, larger heterogeneities are introduced, and the suspension becomes more compressible relative to the compressive yield stress of the uniform suspension. A simple model is proposed in which the heterogeneous suspensions compress by rearrangement of the dense aggregates until a critical concentration (ϕ c , which coincides with the volume fraction prior to dilution) is reached. Above ϕ c , the suspensions consolidate identically to the uniform suspension. With a single fitting parameter (the size of the heterogeneities), the model shows semiquantitative agreement with the experimental data.