Abstract
Uniaxial compression properties of sorghum and millet grain at different moisture contents (12–25% dry basis) and at different kernel orientation were investigated. These included: modulus of deformability, maximum compressive force, deformation and toughness at grain break point. Individual grain kernels of two varieties of sorghum, (Dionje and Jumbo) and one variety of pearl millet, (IM) at 12, 15, 20, and 25% moisture content dry basis (mc.db), were quasi-statically loaded using a J.J.universal tensile testing machine to their breaking point. The modulus of deformability, maximum compressive force required to initiate grain rupture and the grain toughness (energy absorbed at break point per unit volume) decreased with increasing moisture content, while deformation at break point increased as moisture content of the grain increased from 12 to 25% for both sorghum and millet. Sorghum grain kernels loaded on the side loading orientation had lower modulus of deformability and required less compressive force and energy to rupture the grain kernel than those loaded in flat loading orientation. It was concluded that moisture content of the grain has a significant effect on the grain strength properties and sorghum grain kernel is anisotropic with respect to compressive strength.
Recommended Citation
Lazaro, E. (2002). Effect of Moisture and Loading Orientation on the Mechanical Properties of Sorghum and Millet. Tanzania Journal of Engineering and Technology (TJET), 25(2), 21-30. https://doi.org/https://doi.org/10.52339/tjet.v25i2.322
Publisher Name
University of Dar es Salaam