甘蔗尾茎力学特性试验

Experiment on Mechanical Properties of Sugarcane Tail Stalk

为获取甘蔗尾部茎秆的力学特性参数,利用精密型微控电子万能试验机对蔗尾生长点以下1~3节茎秆的拉伸、压缩力学性能进行试验。结果表明:蔗尾节位对抗拉、抗压强度的影响极其显著,抗拉、抗压强度由中部向尾部顶端生长点方向显著减小;蔗尾生长点以下1~3节抗拉强度平均值分别为1.44、2.87、4.72MPa,拉伸弹性模量平均值分别为22.02、27.60、37.09MPa。各节茎秆直径与抗拉强度呈二次函数负相关关系,随着直径的增大,抗拉强度减小。抗压强度平均值分别为4.04、5.22、6.66MPa;压缩弹性模量平均值分别为23.93、25.37、2 4.1 2 MPa;各节茎秆直径与最大压缩载荷之间呈幂函数正相关关系,随着直径的增大,最大压缩载荷增大。试验结果为甘蔗收获断尾机械的设计及建立数学模型进行动力学仿真提供了理论依据。

In order to obtain the mechanical characteristic parameters of sugarcane tail stalk,tensile and compression tests were conducted in the accurate micro- controlled electronic universal testing machine. The results indicated that sugarcane tail node had extremely significant effects on the tensile strength and the compressive strength which decreased from the middle to the tail apical growing points,the results also showed that the average values of tensile strength of 1 ~3 nodes below the tail apical growing points were 1. 44,2. 87,4. 72 MPa,respectively,and their average values of tensile modulus of elasticity were 22. 02,27. 60,37. 09 MPa,respectively; It was quadratic function negative correlation between the diameter and the tensile strength of each nodes in the tail,and the tensile strength decreases with the increase of diameter; their average values of compressive strength were 4. 04,5. 22,6. 66 MPa,respectively,average values of compression modulus of elasticity were 23. 93,25. 37,24. 12 MPa,respectively,it was power function positive correlation between the diameter and the maximum compression load of each nodes in the tail,and with the increase of diameter,the maximum compression load increases. The conclusions provide the theoretical foundation to design tail- breaking mechanism of sugarcane harvester and establish mathematical model for dynamic simulation.