Wild chrysanthemum is a common Chinese herbal medicine characterized by antibacterial and inflammatory effects that can be used to treat diseases such as influenza, cerebrospinal meningitis, and snake bite [
1,
2]. Its stem characteristics are characterized by a high degree of lignification and hardness. Most of the wild chrysanthemum harvest is artificial. Approximately 15–20 people are required per day per acre to harvest wild chrysanthemum, but the harvest cost is relatively high and rises every year. The mechanized harvest of wild chrysanthemum is in its initial stage. The main attempt is to harvest in sections. The existing windrowers (such as the rape windrower) are used for harvesting, but the efficiency is not high. About a third of the thick stems are difficult to cut. The finite element simulation method has been used in mechanical optimization in recent years [
3]. The finite element method has the outstanding advantages of high efficiency, low costs, and shortening the research and the development cycles [
4].
A series of finite element simulation cutting studies were carried out to explore the cutting performance of crops in agriculture. In the 1970s, Tay first used the finite element method to calculate orthogonal cutting tools [
5]. In 2004, Yen et al. [
6] analyzed the relationship between the cutting-edge shape and the cutting force during cutting via the finite element method. Meng et al. [
7] used large CAE software ANSYS/LS-DYNA to perform dynamic simulation on small mulberry tree cutting circular saw blades. The results showed that, under the optimal parameter matching, the cutting section of the mulberry branch performed well, and the working efficiency was relatively high. Souza et al. [
8] used finite element software to explore the influence of the harvester speed on the harvesting process in mechanized coffee harvesting. Yang et al. [
9] established a sugarcane cutting system model based on the FEM (finite element method) and SPH (smoothed particle hydrodynamics) coupling algorithm. Moreover, the authors verified the rationality of the model with physical tests. The finite element simulation method was used to study the force on the sugarcane root, which is of great significance for reducing the cutting resistance. Fielke [
10] predicted the influence of cutting edges with different geometric shapes on tillage force via FEM. Ibrahmi et al. [
11] studied the influence of the cutting depth, cutting speed, and cutting angle on the tillage force of a template plow used in North Africa. The results showed that vertical force decreased linearly with an increase in the cutting angle. When the working depth was 150 mm, the speed was 1 m/s, the lifting angle was 20°, the cutting angle was 30° to 45°, and the energy consumption was minimized. In China, the use of finite element cutting started relatively late. Zhang et al. [
12] used ANSYS/LS-DYNA software to establish the geometric and material models of the cutting device in sugarcane cutting machinery. Two unknown tensors of sugarcane were experimentally and numerically determined, namely, the radial elastic modulus of sugarcane Ex = Ey = 1934 MPa and the radial Poisson’s ratio of sugarcane Uxz = Uyz = 0.314. Guo et al. [
13] obtained stress and energy changes in cutting tomato vine straw using LS-DYNA software. Xi et al. [
14] conducted a display dynamics analysis on the process of cutting the stem with a rotor milling cutter. The results showed that the power consumption of the cutting stem was minimized when the rotor milling cutter speed was 1400 r/min, the blade thickness was 7 mm, and the blade angle was 25°. Huang et al. [
15] used finite element technology to investigate the effect of the cutter angle and cutting speed on the cutting force and improve the performance of the sugarcane cutter. The results showed that the cutting force was minimized when the cutter angle was 0° and the cutter speed was 0.5–0.9 m/s.
Few simulation studies currently exist on the cutting of wild chrysanthemum stem. Furthermore, the simulation process lacks more accurate wild chrysanthemum stem material model parameters. Based on the maximum shear force, physical tests were employed to determine different diameters of wild chrysanthemum flower stalks. On this basis, the Plackett–Burman test and a central composite design experiment were carried out by using finite element simulation to calibrate the stem material parameters. Different diameters of wild chrysanthemum stem test values were compared with the simulation results to validate the accuracy of the calibration parameters. The proposed model will provide a reference for selecting finite element cutting material parameters of wild chrysanthemum stem.