基于有限单元法的芦蒿茎秆力学特性分析

【目的】建立芦蒿Artemisia selengensis茎秆柔性体模型。【方法】根据芦蒿茎秆的物性参数,通过ANSYS有限元分析软件建立茎秆力学模型,对芦蒿茎秆在不同生长部位的轴向、径向压缩力学特性进行研究,分析比较模型计算值和试验测试值。【结果】模型计算值和试验测试值最大偏差为14.46%。芦蒿茎秆具有各向异性特征,其轴向压缩力学特性远大于径向;在3种不同位置段,径向压缩时,茎秆破碎出现在加载面的两端边缘位置,轴向压缩时,茎秆破碎出现在加载面,且应力由接近加载区域向周围逐渐减弱。【结论】可以运用模型仿真分析芦蒿茎秆力学特性,结果可为减少芦蒿在收获、运输、加工、储藏过程中的机械损伤和芦蒿收获机具的研制提供理论依据和参考。

Finite element analysis of mechanical properties of Artemisia selengensis stalk

Objective] To establish a stalk flexible model of Artemisia selengensis.Method]Based on the physical parameters of the stalk of A.selengensis, the finite element model of stalk was established by using the ANSYS software.The axial and radial mechanical properties of A.selengensis stalk at different growth positions under compression were studied.The model calculation value and experimental value were analyzed and compared.Result]The maximum deviation of model calculation value and experimental value was 14.46%.A.selengensis stalk had anisotropic characteristics with its axial compression mechanical properties being much better compared to the radial.At three different positions, the stem breakage occurred on the edges of both ends of the loading surface under radial compression,while under axial compression, the stem breakage occurred on the loading surface, and the stress gradually receded from close to the loading area to surroundings.Conclusion]The mechanical properties of A.selengensis stalk can be analyzed by model simulation, and the results can provide theoretical references for reducing mechanical damage during harvesting, transportation, processing and storage of A.selengensis and for designing A.selengensis harvest machine.