Abstract
ABSTRACT THE fracture resistance of whole soybeans was measured in terms of average compressive force, deformation, and toughness at seedcoat rupture. Amsoy-71, Corsoy, and Williams varieties at moisture contents of 8, 11, 14, and 17 percent w.b. were quasi-statically loaded in a horizontal hilum and vertical hilum position. Force required to initiate seedcoat rupture decreased as soybean moisture content in-creased from 8 to 17 percent. Soybeans loaded in the vertical hilum position consistently developed seedcoat cracks at lower levels of force than those in the horizontal hilum position. Maximum toughness occurred in the 11 to 14 percent moisture range, indicating an optimum moisture range for absorbing compressive energy. Soybeans loaded in the vertical hilum position required less energy for seedcoat rupture than those in the horizontal hilum position. Maximum allowable com-pressive energy levels often fell below the impact energy levels that would occur during normal dropping and other handling operations.
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