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In this research some mechanical properties of black-eye pea (Vigna sinensis L) including deformation at rupture point, required force to rupture, required energy to rupture and toughness were determined in a factorial experiment based on a randomized complete design with three factors including moisture content (7.43, 9, 10.5 and 12 percent in dry basis), loading velocity of 5, 30, 55 and 80 (mm/min) and seed size (small, medium and large). The results showed that grain moisture content had significant effect (p< 1%) on all mechanical properties. With increasing moisture content, required energy for rupturing, toughness and deformation at rupture point increased, while required force for rupturing was decreased. By increasing the loading velocity, the deformation at rupture point, required force to rupture, required energy to rupture and toughness were decreased. By increasing the seed size, the deformation at rupture point, required force to rupture, required energy to rupture and toughness were increased. The triple interaction effect of loading velocity × seed size × moisture content was significant on deformation at rupture point (p< 1%) and required energy to rupture (p< 0.05), but was not significant on the required force to rupture.  

Keywords: Black-eye pea, Mechanical properties, Toughness, Rupturing

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