Abstract
An elastic/viscoplastic model with non-associated flow rule for microcrystalline cellulose powder PH-105 with mean particle size 20 μm is formulated using experimental data from a number of triaxial tests. The model reproduces the major aspects of the complex powder response that is governed by plastic (dependent on history of the loading) effects, time effects (both creep and relaxation) and irreversible volumetric changes (it is practically the compressibility that was observed in the experiments on the microcrystalline cellulose powder with mean particle size 20 μm). Constitutive parameters and functions of the presented model (the elastic parameters, yield function and viscoplastic potential) were determined directly from the experimental data. Finally, the validity of the model has been discussed. Published by Elsevier Science Ltd.
Original language | English (US) |
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Pages (from-to) | 391-399 |
Number of pages | 9 |
Journal | Mechanics of Materials |
Volume | 34 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2002 |
Externally published | Yes |
Keywords
- Constitutive model
- Flow rule
- Microcrystalline cellulose
- Viscoplasticity
ASJC Scopus subject areas
- Mechanics of Materials
- Instrumentation
- General Materials Science