Nonlinear viscous-elastic-plastic model and creep simulation of sesame and peanut

By combined use of theoretical model with empirical model, the nonlinear viscous-elastic-plastic model of sesame and peanut was developed on the basis of the rheological test. The parameter inversion of constitutive model, using improved simulated annealing, was carried out. Numerical simulation of creep of sesame and peanut was carried out. Greatest relative deviation below 5.7% between the experimental and predicted values of the strain indicates that the nonlinear viscous-elastic-plastic constitutive model can simulate rheological behaviors of sesame and peanut well. The press time for balance of sesame and peanut was selected by using curves of creep rate.