玉米秸秆木质纤维含量与应力松弛特性关联度研究  

Grey Relation Analysis of Lignocellulose Content and Compression Stress Relaxation of Corn Stalk

作　　者：廖娜[1] 陈龙健[1] 黄光群[1] 贺城[1] 韩鲁佳[1] 

机构地区：[1]中国农业大学工学院,北京100083

出　　处：《农业机械学报》2011年第12期127-132,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：公益性行业(农业)科研专项资助项目(201003063);国家高技术研究发展计划(863计划)资助项目(2009AA043603)

摘　　要：应力松弛是玉米秸秆重要的流变特性,直接影响到玉米秸秆打捆的压缩变形、生产率和功耗。利用INSTRON 3367材料试验机和自制压缩筒组件进行了玉米秸秆闭式压缩应力松弛试验,并测定了北京、辽宁、山东、湖北、陕西和重庆等地13个不同品种的成熟期玉米秸秆纤维素、半纤维素和木质素质量分数。以拟合应力松弛曲线得到的应力松弛时间、平衡弹性模量等作为应力松弛特性考核指标,采用灰色关联法分析玉米秸秆的应力松弛特性与木质纤维组成的相关性。研究表明,不同品种的玉米秸秆纤维素、半纤维素和木质素质量分数差异均显著(P<0.05),应力松弛时间和平衡弹性模量主要与木质素质量分数相关,半纤维素质量分数主要与应力松弛时间相关,而三参数与纤维素质量分数相关度均较低。从微观角度来看,其关联度主要取决于各成分在细胞壁中的位置和功能。Stress relaxation is one of important rheological characteristics of corn stalk compression bale,affecting compression deformation,productivity and power consumption.Cellulose,hemicellulose and lignin content of 13 different varieties of corn stalks in matured from Beijing,Liaoning,Shandong,Hubei,Shaanxi and Chongqing were measured.Compression and stress relaxation of corn stalks were implemented in the self-made cylinders by universal testing machine INSTRON3367.The stress relaxation times and balance elastic modulus were gotten by fitting stress relaxation curves of corn stalks,and were treated as assessment indicators of stress relaxation properties.Gray correlation analysis was applied in the relevance between the stress relaxation properties of corn stalks and the lignocellulose ingredients.The results showed that differences among cellulose,hemicellulose and lignin contents of different varieties of corn stalks were highly significant（P0.05）.It was found that hemicellulose and lignin contents were highly correlated with stress relaxation properties of corn stalks,while the cellulose content of corn stalks was little effect on stress relaxation properties.From a microscopic point of view,correlation degrees of cellulose,hemicellulose and lignin content associated with stress relaxation properties depended on their regions and functions in the cell wall.

关 键 词：玉米秸秆 压缩 应力松弛 灰色关联分析 

分 类 号：S216.2[农业科学—农业机械化工程]