Abstract
ABSTRACT EXPERIMENTS to determine dynamic mechanical properties of brown rice, variety IR-8, were car-ried out with cylindrically shaped specimens tested uniaxially along the cylindrical axis. Storage and loss moduli were determined from 100 to 1000 Hz forcing frequency at four different moisture levels from 12 to 29 percent (dry basis). Statistical analyses of the test data revealed the stress-strain relations for the rice grain to be frequency as well as moisture dependent with the moduli increasing with frequency of loading and decreasing with moisture content. Statistical curve fitting resulted in a mathematical relaxation modulus expression at each moisture level that was equivalent to a Maxwell model mechanical repre-sentation. General equations for storage and loss moduli as functions of frequency and moisture content were also developed.
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