Finite Element Model Construction and Cutting Parameter Calibration of Wild Chrysanthemum Stem

Due to a lack of an accurate model in finite element simulation mechanized harvesting wild chrysanthemum, the stem chrysanthemum period is taken as research object. ANSYS Workbench 19.0 software and LS-DYNA (LS-PrePOST-4.3-X64) are used calibrate cutting. The diameter distribution at cutting height obtained. maximum shear forces different diameters (7 mm, 8 9 10 11 mm) within range determined 120.0 N, 159.2 213.8 300.0 378.2 respectively, by using biomechanical testing machine custom-made blade. Plastic_Kinematic failure simulate process method. Plackett–Burman test employed screen out factors that significantly affect results, namely, yield stress, strain, strain rate parameter C. regression between force significant parameters obtained central composite design experiments. To obtain parameters, measured values substituted into equation target values. In other words, stress 17.96 MPa, C 87.27, 0.0387. carried with parameters. results showed error simulated actual value stems 7.8%. This indicates calibrated relevant can be method provide basis for subsequent simulations.