玉米果穗动力接触的有限元分析

doi:10.16182/j.issn1004731x.joss.201701010

摘要/Abstract

摘要： 根据玉米果穗的组砌规律,在建立玉米果穗几何模型与有限元计算模型的基础上,采用ANSYS/LS-DYNA有限元分析软件对玉米果穗在楔形冲击头作用下动力接触过程中应力分布及传递过程进行了分析。结果表明：玉米果穗受冲击部位籽粒等效应力较大,冲头初接触时等效应力集中分布于受冲果穗籽粒两侧,随冲头下降,等效应力由受冲部位向两侧传递,果柄由受冲部位横向沿籽粒组砌规律顺序断裂,等效应力分布较初始接触时分散。经模型计算和试验结果相比较,得出玉米果穗受冲击的宏观籽粒离散特性和离散方向与模拟结果相吻合,籽粒离散与应力传递是沿果穗籽粒组砌规律进行。

关键词: 玉米, 果穗, 动力接触, 有限元分析

Abstract: According to the arrangement law of corn ear kernels, the solid model and the finite element model of the corn ear were established. ANSYS LS-DYNA software was used to analyze the distribution and transmission of stress on the corn ear shocked by wedge impact head. The simulation shows that on the corn ear the Von Mises of the region which is shocked is bigger than other region. Initial phase of the impact head shocking the corn ear, the Von Mises concentrate on both sides of shocked corn kernels. With the falling of the impact head, the Von Mises transmit to both sides of shocked corn kernels further and the stalk of corn was broken sequentially to the both sides of shocked corn kernel and the Von Mises was not so concentrated as before. It is found that the discrete features and the discrete direction of the shocked kernels are consistent with the simulated results by comparing the model calculation and the test results. The discrete of kernels and the transmission of Von Mises is along with the arrangement law of corn ear.

Key words: corn, ear, dynamic contact, finite element method

中图分类号:

TJ765.4

李心平, 马磊. 玉米果穗动力接触的有限元分析[J]. 系统仿真学报, 2017, 29(1): 67-75.

Li Xinping, Ma Lei. Analysis of Finite Element Method on Dynamic Contact of Corn Ear[J]. Journal of System Simulation, 2017, 29(1): 67-75.

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