Brittle to Plastic Transition in the Dynamic Mechanical Behavior of Partially Saturated Granular Materials

[+] Author and Article Information
Simon M. Iveson, Neil W. Page

Faculty of Engineering and Built Environment, University of Newcastle, Callaghan NSW 2308, Australia

J. Appl. Mech 71(4), 470-475 (Sep 07, 2004) (6 pages) doi:10.1115/1.1753269 History: Received July 01, 2002; Revised November 20, 2003; Online September 07, 2004
Copyright © 2004 by ASME
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Photos of pellets after 10 mm deformation at various speeds for (a) 0.01 Pa⋅s, (b) 1.0 Pa⋅s, and (c) 60 Pa⋅s viscosity silicone oils. Initial pellet aspect ratio 1.25 (25 mm×ϕ20 mm). Scale: diameter of bottom platen is 38 mm.
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The dimensionless flow stress results of Iveson et al. 17 with added schematics of deformed pellets shown above selected points. Pellets: 35% porosity, 70% saturation, 35 micron glass ballotini. Line shows best fit of Eq. (1).
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Schematic of shear failure modes for (a) dry granular material and (b) Newtonian liquid in laminar flow
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Schematic of model showing how successive planes simultaneously fail as applied bulk strain rate increases
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Flow stress as a function of capillary number for the single-failure-plane model, Eq. (12), and the multiple-failure-plane model, Eqs. (18) and (21), using a1=1.0,Δa=0.01, and b=0.1




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