Calibration of Ramie Stalk Contact Parameters Based on the Discrete Element Method

To obtain the physical parameters and contact of ramie stalk decorticating simulation, structural dimensions, density, moisture content, elastic modulus, were measured in this study based on phloem xylem stalk. The stacking angles by cylinder lift method extraction partition method, respectively. between directly calibrated. Additionally, phloem–phloem, phloem–Q235A steel, xylem–xylem, xylem–Q235A steel used as calibration objects, simulated angle was evaluation index. Then, Plackett–Burman test designed to screen for which significantly affecting angle. Furthermore, steepest ascent determined optimal range values two significant three xylem. Based central composite design, second-order regression equations established, 37.93° 27.17° target parameter group. results showed that restitution, static, rolling friction coefficients 0.60, 0.53, 0.021, static 0.41 0.056, coefficient Q235A 0.033, 0.44 0.016, verification relative error less than 2.11%, further indicated modeling models accurate reliable. They can be subsequent simulation tests bonding simulations.