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Multidimensional Modeling of Agricultural Fibrous Materials in Densification: Compression Stage
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org
Citation: Paper number 023151, 2002 ASAE Annual Meeting . (doi: 10.13031/2013.11234) @2002Authors: Guillermo Muñoz, Pedro Herrera
Keywords: Modeling, Agricultural Fibrous Materials, Densification, Compression
In order to design machinery such as extruders, pelletizers, cubers and briquetters used to
compact biological materials such as fibrous agricultural residues, it is necessary to have some
knowledge about the mechanical behavior of such materials at all stages of their process. These
materials posses mechanical properties which are dependent on the applied stress and strain, strain
rate, humidity content, temperature, amongst other parameters. In this study two models were used
to explore the behavior of these materials, namely, the Maxwell model and the crushable foam
model.
The first analysis was performed considering a piecewise linear viscoelastic behavior and to
determine the model parameters. A comparison with experimental results showed differences of the
order of 3.5 % for both axial and transverse stresses.
On the other hand, the crushable foam model which uses the concept of a yield surface which is
dependent on the dilatational deformation. Comparison of the crushable foam model with
experimental results for axial stresses have differences of the order of 1%, but it overestimates the
lateral stresses for relative densities lower than 1.0 for a 50% approximately.