基于ANSYS的菜用甘薯茎尖切割有限元分析与试验

切割作业是菜用甘薯茎尖收获中的重要环节,为提高菜用甘薯茎尖机械化收获的茎尖完整率,保证作业质量,采用静态测量法,运用质构仪等试验仪器对收获期菜用甘薯茎尖开展力学特性研究,获得其径向剪切模量为1.07MPa,轴向剪切模量为1.87MPa,结合数据,利用建模软件Inventor和仿真分析软件Ansys中的LS-DYNA模块对0.5m/s、0.6m/s、0.7m/s三个切割速度下切割过程进行显示动力学分析,获得对应的菜用甘薯茎尖的应力应变云图,并对其进行分析,最后依据仿真结果开展验证试验,结果与仿真分析结果基本一致,且结果表明切割速度宜设在0.6~0.7m/s,在此切割速度范围内可有效保证茎尖完整率。研究结果可为今后中国菜用甘薯茎尖收获装备发展提供有力支撑和理论基础。

Finite element analysis and experiment of cutting stem tip of vegetable sweet potato based on ANSYS

Cutting operation is an important part in the harvest of vegetable sweet potato shoot tips. In order to improve the cutting complete rate of mechanized harvest of vegetable sweet potato shoot tips and ensure the quality of the work, static measurement methods and texture testers and other testing instruments were used to harvest vegetables. The mechanical characteristics of sweet potato stem tips were studied, and the radial shear modulus was 1.07 MPa and the axial shear modulus was 1.87 MPa. Based on the data, the LS-DYNA module in the modeling software Inventor and the simulation analysis software Ansys were used. The dynamics of cutting process at three cutting speeds of 0.5 m/s, 0.6 m/s, and 0.7 m/s were analyzed. The stress-strain cloud diagrams of the corresponding vegetable sweet potato stem tips were obtained and analyzed. The verification results were verified by simulation results. The results were basically consistent with the results of simulation analysis. The results showed that the cutting speed should be set at about 0.6~0.7 m/s. Within this cutting speed range, the complete rate of stem tip cutting can be effectively guaranteed. The test research supplies a strong support and theoretical basis to the mechanical development of the harvester for vegetable sweet potatoes’ stem tips.