豌豆茎秆力学特性试验  

Experiment on mechanical properties of pea stalks

作　　者：王君[1] 张克平[1] 张锋伟[1] 柴强[1] 

机构地区：[1]甘肃农业大学工学院,兰州市730070

出　　处：《中国农机化学报》2016年第12期103-107,共5页Journal of Chinese Agricultural Mechanization

基　　金：国家科技支撑计划(2012BAD14B10);国家公益性行业计划课题(20110301);国家自然科学基金项目(51265001);甘肃农业大学伏羲青年英才培养计划项目(FXYC20130103)

摘　　要：为解决现有豌豆茎秆力学特性参数不足的问题,本试验以甘肃地区成熟期的豌豆茎秆作为研究对象,采用正交试验方法,在CMT2502型微机控制电子万能试验机上进行试验,探究不同因素对其拉伸和剪切力学特性的影响。试验结果表明：豌豆茎秆在承受拉力时无茎节处抗拉强度较大,相当于其有茎节处的1.6倍,并在10mm/min左右的加载速度下达到相对最大值10.964MPa;在承受剪切力时,豌豆茎秆距地表300~900mm中部茎段抗剪切性能更优,其抗剪强度可达到3.26MPa,且其抗剪强度随加载速度的增大而降低,随含水率的增大呈先上升后下降的趋势,在含水率为65%时可达到最大值3.11MPa。该研究为找到豌豆最佳收割时期、方式以及其相关农业机具的设计和优化提供理论依据。In order to solve the problem of insufficient existing mechanical parameters of pea stalks, stalks during maturity in Gansu Province was studied. The experiments were conducted on CMT2502 electronic universal testing machine with orthogonal test method and the influence of different factors on tensile and shear characteristics were explored. The test results show that larger tensile strength exists at the section with no stem node when pea stalks are under tension, equivalent of 1.6 times that with stem node and can achieve the relative maximum value of 10. 964MPa when the loading speed is 10ram/rain. Under the shearing force, better shearing resistance obtains at the middle segment of stalks which ranging from 300mm to 900ram above the ground and its shear strength can achieve 3.26MPa. The shear strength decreases with the increasing of loading speed, firstly increases and then decreases with the increasing of water content. When the water content is about 65%, shear strength can reach the maximum value of 3.11MPa. Best harvesting time and method of peas are found in this study and theoretical basis for designing and optimizing related agricultural implements are provided.

关 键 词：豌豆茎秆 力学特性 抗拉强度 剪切强度 正交试验 

分 类 号：S643.3[农业科学—蔬菜学]