芝麻、花生在压榨过程中非线性粘弹塑性模型与蠕变模拟

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

在芝麻、花生流变试验的基础上,采用模型理论与经验模型相结合的方法建立芝麻、花生非线性粘弹塑性模型,并运用改进模拟退火计算方法对模型参数反演。数值模拟芝麻、花生、碎花生的蠕变,数值模拟的最大相对误差分别为5.7%、1.5%、4.3%,结果表明,非线性粘弹塑性模型能较好描述芝麻、花生流变特性。运用蠕变速率曲线确定了芝麻、花生、碎花生的平衡压榨时间。

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.