Effects of microstructure on the compressive yield stress

Journal Article · Sat Jan 01 04:00:00 EST 2000 · AIChE Journal (American Institute of Chemical Engineers)

DOI:https://doi.org/10.1002/aic.690460110· OSTI ID:20015201

Channell, G M; Miller, K T; Zukoski, C F

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 ({phi}, which coincides with the volume fraction prior to dilution) is reached. Above {phi}, 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.

• Research Organization: Univ. of Illinois, Urbana, IL (US)
• OSTI ID: 20015201
• Journal Information: AIChE Journal (American Institute of Chemical Engineers), Journal Name: AIChE Journal (American Institute of Chemical Engineers) Journal Issue: 1 Vol. 46; ISSN AICEAC; ISSN 0001-1541
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM OXIDES
COMPRESSION STRENGTH
MICROSTRUCTURE
STRESSES
SUSPENSIONS
YIELD STRENGTH