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Development of Constitutive Models for Densification of Corn Stover and Switchgrass

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  076071.(doi:10.13031/2013.24062)
Authors:   Nalladurai Kaliyan, R Vance Morey
Keywords:   Biomass, Constitutive model, Corn stover, Densification, Switchgrass

A constitutive model is an important input to the computer simulation of densification of powders. An elasto-visco-plastic solid model was developed for characterizing the compression behaviors of corn stover and switchgrass grinds. The constitutive model characterized the biomass grinds through five parameters: elastic modulus, strength coefficient, strain hardening exponent, viscous coefficient, and frictional loss factor. The constitutive model parameters were found to be affected by the densification conditions (i.e., applied stress, particle size, moisture content, and preheating temperature). During compression of biomass grinds, the development of the structure of the compact inside the die was captured by the elastic modulus. Also, the elastic modulus and viscous coefficient correlated with the durability and compressive strength of briquettes made from corn stover and switchgrass at various densification conditions.

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