糜子茎秆弯曲和剪切力学性质试验研究

Experimental Study on Bending and Shear Mechanical Properties of Panicum miliaceum Stalk

以不同品种的糜子茎秆为研究对象,试验测定其剪切和弯曲力学性质随着节间位置变化的规律。试验结果表明,3种品种糜子茎秆的弹性模量、抗弯强度、抗弯刚度值均为第二节间最小,说明第二节间抗弯折能力较弱;剪切力和剪切强度均为第一节间最大(最大剪切力471.3 N,最大剪切强度3.69 MPa)。因此,设计收获机具时,应以作物第一节间的剪切力、剪切强度为参数进行设计计算。

In this paper,different varieties of Panicum miliaceum stem as the study object,determine its shear and bending mechanical properties with the change of internode position.The results showed that the elastic modulus,bending strength and bending stiffness of the three Panicum miliaceum stalks were the smallest among the second internodes,which indicated that the bending resistance of the second internodes was weak.The shear force and shear strength between the first section were the maximum(the maximum shear force is 471.3 N,the maximum shear strength is 3.69 MPa).When designing the harvester,the shear force and shear strength of the first section should be taken as parameters for design calculation.