【摘要】 已有芦苇秸秆离散元模型构建时未考虑茎节对秸秆力学特性的影响，针对这一问题，通过拉伸试验测定芦苇秸秆的基础参数，采用Hertz-Mindlin with Bonding模型构建带节芦苇秸秆离散元模型。以拟合优度指数(GFI)为评价指标，依次开展正交筛选试验和最陡爬坡试验以确定显著参数，再利用响应面试验确定显著参数最优值，并对模型参数进行了验证。结果表明，单位面积法向刚度与切向刚度对拟合优度指数存在显著影响，最优值分别为5.4×10~9 N/m~3和5.2×10~8N/m~3，拟合优度指数均高于0.97，模型可准确反映带节芦苇秸秆力学特性，为其加工装备研发提供支撑。更多还原

【Abstract】 The existing discrete element model for reed straw fails to consider the effect of reed stem nodes on its mechanical properties. To address this issue, basic parameters of reed straw were determined via tensile tests, and a discrete element model for node-containing reed straw was established using the Hertz-Mindlin with Bonding model. Using the goodness of fit index(GFI) as the evaluation indicator, orthogonal screening tests and steepest ascent tests were sequentially performed to screen and identify significant parameters. Response surface tests were then adopted to obtain the optimal values of these significant parameters, and the model parameters were verified. The results show that normal stiffness per unit area and tangential stiffness per unit area exert a significant effect on the goodness of fit index, with their optimal values being 5.4×10~9 N/m~3 and 5.2×10~8 N/m~3, respectively. The goodness of fit index was above 0.97, demonstrating that the model can accurately characterize the mechanical properties of reed straw and provide support for the design and development of relevant processing equipment.更多还原