Rheologic behavior of chopped corn stalks during rotary compression

In order to provide basic date for design and technology for round trapped baler, it is needed to understand the rheologic laws of chopped corn stalks in the course of rotary compression. A test bed was developed for analyzing the principle of rotary compression and forming. Rotary compression the chopped corn stalks, and the rotary compression test and stress relaxation experiments of chopped corn stalks were studied. The rheological characteristics of chopped corn stalks in rotary compression process was investigated. Using linear viscoelastic theory, the Burges Model was constructed. Fitting the stress relaxation curve through residual method, the stress relaxation model and its parameters were got, and the coefficient of determination was calculated. Burges Model's viscous-elastic parameters was solved using relevant formula, and E1 was 18.33 kPa, k1 was 994.81 kPa, E2 was 27.64 kPa, k2 was 2 342.49 kPa. The viscosity coefficient was far greater than the elastic modulus, so the rheologic laws of chopped corn stalks tend to fluid. The study provide a reference for the further study on the technology of chopped corn stalks' rotary compression, and the optimization design of techniques and equipment.