Investigation some of physical and mechanical properties of sunflower seed

Shojaei, Rahim (2018) Investigation some of physical and mechanical properties of sunflower seed. Masters thesis, University of Mohaghegh Ardabili.

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Abstract

In this study, some physical and mechanical properties of three varieties of sunflower seeds (almond, round, white, thin) in loading speeds of 10, 25, 40 and 55 mm per minute and in two longitudinal and lateral direction in 10 replications in a factorial experiment in completely randomized design were investigated. Also, some geometric and frictional properties of three varieties of sunflower seeds including average volume, length, width, mass density, weight, and static friction coefficient were determined on three levels of wood, steel and aluminium. Data analysis was performed using MSTATC statistical software. Static friction coefficient for the main effect of the varieties and the type of friction surface and the interaction between the varieties and the type of friction surface are not significant. Mass density on varieties parameters is significant at 1% probability level.The largest mass density for the white-tailed varieties is 2,361 grams per cubic centimeter and the lowest density for Badami varieties is 971/1 grams per cubic centimeter as well as to the Galami varieties the bulk density is 067/2 grams per cubic centimeter. Also, some mechanical properties of sunflower seeds of almond, dwarf and pink varieties including deformation at break point, rupture force, rupture energy and toughness in factorial experiment in completely randomized design with 3 factors including 3 cultivars (Lambda, Dusiphid and Khmumi), 4 loading speeds (10, 25, 40 and 55 mm / min) and 2 loading direction (longitudinal and transverse) were determined under compression loading. . Th results showed that all the main effects of factors and binary effects and the triple interaction of the factors are significant for the rupture force and deformation at the point of failure at the probability level of 1% and 5%, except for loading speed and loading direction for deformation at the point of failure. The force required to break the almond varieties in lateral and longitudinal loading averagelly was more than dwarf and pencil as well as increasing the loading speed, the energy needed to rupture the almond and spruce varieties decreased and And toughness white-footedness varieties increase with increasing loading speed. The main effect of loading speed, the interaction between loading speed and variety and loading speed, and the interaction effect of loading speed and loading direction on the rupture energy of sunflower seed is significant at 1% level. the main effect of loading speed, the interaction between loading speed and variety, and the main effect for loading direction, and the interaction between loading speed and loading for sunflower seedlings are significant at 1% probability level. As well as the main effect of the variety And the interaction effect for loading speed and variety and the triple interaction effect of loading speed, loadinged direction and variety for energy failure and toughness were not significant. The results show that in all loading speeds, rupture energy and toughness of sunflower seeds in the lateral direction were greater than the rupture energy and toughness in the longitudinal direction.

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