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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。
According to the law of the formation of corn ear, on the basis of establishing corn ear geometry model and finite element calculation model, the stress distribution and transmission of corn ear during dynamic contact with corn ear under the action of wedge impact head were analyzed by using the finite element analysis software ANSYS / LS-DYNA The process was analyzed. The results showed that the equivalent stress of the ear was higher than that of the ear, the equivalent stress concentratedly distributed on both sides of the ear, and the equivalent stress was transferred from the affected part to both sides. The stems from the affected part of the grain along the horizontal cross-stacking regular rupture, the equivalent stress distribution than the initial contact dispersion. Comparing the calculated results with the experimental results, it is concluded that the macroscopic kernel discrepancy and the discrepancy direction of the ear of corn are in good agreement with the simulation results. The grain discretization and stress transfer are based on the rules of the ear kernel assemblage.