甘蔗尾茎泊松比的试验分析

【目的】为甘蔗断尾机构的设计及数学模型的建立进行动力学仿真提供理论依据。【方法】利用精密型微控电子万能试验机和静态电阻应变仪对甘蔗尾茎生长点以下第5、6节甘蔗皮、芯、节部位进行拉伸试验,并用电测法与力学分析得出各组分的泊松比参数。【结果】甘蔗尾茎生长点以下第5节甘蔗皮同性面泊松比小于0.028,异性面泊松比为0.233;第5节甘蔗芯同性面泊松比小于0.174,异性面泊松比为0.271;甘蔗尾茎生长点以下第6节甘蔗皮同性面泊松比小于0.001,异性面泊松比为0.238;第6节甘蔗芯同性面泊松比小于0.223,异性面泊松比为0.289;甘蔗节同性面泊松比小于0.305,异性面泊松比为0.344。【结论】甘蔗尾茎内部不同部位的同性面泊松比存在显著差异,异性面泊松比差异不大;甘蔗尾茎生长点以下第5、6节皮、芯同性面泊松比有显著差异,异性面泊松比差异不显著。

Experimental study on Poisson's ratio of sugarcane tail stalk

Objective To provide a theoretical basis for designing a device cutting sugarcane tail stalk and establishing a mathematical model for dynamic simulation.Method The precision micro control electronic universal testing machine and static resistance strain gauge were used to perform tensile tests on sugarcane skin, core and joints of the fifth and sixth sections below the growing points of sugarcane tail stalk. The Poisson''s ratio parameters of each component were obtained by electrometric method and mechanical analysis.Result The PRXY of sugarcane skin and core of the fifth section below the growing points of sugarcane tail stalk was less than 0.028 and 0.174, and the NUXY was 0.233 and 0.271, respectively. The PRXY of sugarcane skin and core of the sixth section below the growing points was less than 0.001 and 0.223, and the NUXY was 0.238 and 0.289 respectively. The PRXY of sugarcane joint was less than 0.305 and the NUXY was 0.344.Conclusion The PRXY has significant differences among different parts of the sugarcane tail stalk, while the NUXY has little difference. Sugarcane skin and core both have significant differences in PRXY between the fifth and sixth sections below the growing points of sugarcane tail stalk, which has no significant difference in NUXY.