玉米秸秆压缩加载条件对其裂纹和机器功耗的影响  

Effects of loading conditions on cracks of corn stalk and power consumption of machine

作　　者：刘立意[1] 邴媛媛[1] 董欣[1] 艾青牧[1] 杨西同 

机构地区：[1]东北农业大学工程学院,哈尔滨150030

出　　处：《农业工程学报》2014年第3期163-169,共7页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA043602)

摘　　要：针对中国北方刚收获的玉米秸秆含水率高需进行调质处理的情况,为设计玉米秸秆调质装置,该文通过单因素试验,研究了压缩调质时加载方式(单点直压和三点弯曲)、加载位置(节间和节部)和加载方向(长轴和短轴)对相同含水率玉米秸秆压缩裂纹、载荷和功耗的影响。结果表明:施压过程中,2种加载方式的秸秆表皮均沿轴向产生4条主裂纹,且其呈上、下、左、右对称分布。加载位置和加载方向相同时,三点弯曲和单点直压开始产生各主裂纹的压下位移相近,但前者的载荷和功耗均低于后者。当达到最佳调质压下位移(18 mm)时,三点弯曲载荷和功耗的均值较单点直压分别显著降低约55.5%和25.5%(α=0.05)。研究结果为玉米秸秆收获调质装备关键部件的设计提供依据。Because high moisture content of the new-harvested corn stalks in northern China, drying process is long under natural conditions in which limit instantaneous harvesting and bundling. Fracturing and laceration on corn stalks need to be adjusted for rapid drying of corn stalks and to overcome bundle below. In order to design corn stalk adjusting material device, two single factor experiments were designed according to loading forms including single-point direct pressure and three-point bending in this study. Each experiment included four levels as： internode and short axis, internode and long axis, node and short axis and node and long axis. Impacts of loading forms （single-point direct pressure and three-point bending）, loading positions （intemode and node） and loading directions （long axis and short axis） on the cracks, load and power consumption of corn stalks with the same moisture content were investigated based on single factor experiment design scheme during compression process. The results indicated that four main cracks were produced on the rind of corn stalks under two loading forms on the axial during the compression process. Four main cracks of each corn stalks showed up, down, left and right symmetrical distribution, a number of small cracks were also produced. The main cracks gradually extended with the increasing of the displacements. When the displacements reached 18 mm for the internode compression samples, the main cracks extended to the vicinity of the node, and continuously reached to compression. The main cracks then stopped expanding due to the constraints of the node. The main cracks extended to the entire length of the sample for the node compression samples, the depth of all cracks were equal to the epidermis thickness of the sample. This study showed that length and depth of the main cracks of two loading forms were the same, so the best adjusting ending displacement was set to 18 mm. With the same loading positions and loading directions, the displacements of main cracks pr

关 键 词：秸秆 裂纹 载荷 调质处理 功耗 

分 类 号：S513[农业科学—作物学]