Plastic Model And Finite Element Simulation Analysis Of The Mechanical Pressing Of Vegetable Oilseeds

In this paper, on the basis of available achievement of pressing theory and experiment research, experiment of a sunflower oil-point pressure was carried out using a visual testing apparatus and different loading rate. The empirical formula of oil-point pressure was developed by regression analysis. Loading rate 0.01kN / s was proposed as a measurement of the oil-point pressure. The oil-point pressures of peanut kernels, peanut, castor bean, sunflower, sesame, cottonseed, oil-tea camellia, flaxseed and soybean were measured at loading rate 0.01kN / s. The experiments for stress-strains and lateral stress of sunflower, soybean, peanut, sesame, cotton seeds, castor bean, oil-tea camellia were carried out by uniaxial pressing. By using of Kuhn's yield criterion, plasticity constitutive equations were developed. The results show that the Kuhn's yield criterion can be used as theoretical basis for plasticity model of sunflower, soybean, peanut, sesame, cotton seeds, castor bean and oil-tea camellia. Numerical simulations of oil extraction for sunflower, soybean, peanut, sesame, cotton seeds, castor bean and oil-tea camellia were carried. Simulated results are in good agreement with the measured results.