关键词: 鸡毛菜茎秆, 力学特性, 压缩试验, 切割模型, 有限元分析, 田间试验

Abstract: Cutting device is a key part in orderly harvesting Chinese little greens. In order to reduce the loss and damage rate during this process and improve harvest efficiency, this paper measured and analyzed a series of mechanical properties of Chinese little greens stalks under compression condition by static measurement method. The results showed that the range of stalk axial elastic modulus was 3.15~3.91 MPa, and radial elastic modulus range was 20.24~20.99 MPa. The relevant values of the mechanical properties of Chinese little greens stalks were combined with the finite element analysis software ANSYS to establish a stalk material library, and then the 3-dimensional modeling software SolidWorks was used to construct the model for cutting process, which was imported into ANSYS for displaying dynamics analysis and verifying the results obtained from finite element analysis in field experiment. The comparison results showed that when knife reciprocating speed was more than 0.40 m/s, the stalks of Chinese little greens could be effectively cut with tidy cutting stubble and smooth fractures. These analysis results provided theoretical basis for future designing and parameter optimization of the components of cutting Chinese little greens.

Key words: stalks of Chinese little greens, mechanical properties, compression test, cutting model, finite element analysis, field test