气雾栽培马铃薯块茎的基本物理特性  

Physical properties of potato tuber cultured by aeroponics

作　　者：于海业[1,2] 乔建磊[1,2] 肖英奎[1,2] 王淑杰[1,2] 张艳萍[1,2] 

机构地区：[1]吉林大学生物与农业工程学院,长春130022 [2]吉林大学工程仿生教育部重点实验室,长春130022

出　　处：《吉林大学学报（工学版）》2011年第1期282-287,共6页Journal of Jilin University:Engineering and Technology Edition

基　　金：'863'国家高技术研究发展计划项目(2007AA10Z203);吉林省科技发展计划项目(20090566)

摘　　要：对气雾栽培马铃薯块茎进行了压缩破坏和静载蠕变试验,分析了不同加载方向和不同加载速率对其破裂应力和破裂应变的影响。运用四元件Burgers模型对气雾栽培马铃薯块茎的蠕变过程进行了模拟,探索了其流变特性。压缩破坏试验表明,气雾栽培马铃薯沿各轴向压缩时的屈服极限和破坏极限均低于土壤栽培的马铃薯,压缩载荷的加载速率对气雾栽培马铃薯块茎组织的破裂应力影响不大,但对破裂应变影响较大。此外,蠕变测试结果表明,在外荷载作用下气雾栽培马铃薯呈现出明显的黏弹性变形和黏滞流动性。Burgers模型中的元件参数拟合值可以很好地反映其蠕变特性,各轴向的模型相关系数均在0.95以上。研究结果为减少气雾栽培马铃薯在生产环节的机械损伤提供了理论依据。The compressive and static creep tests were conducted for the aeroponic potato tuber to analyze the effects of loading direction and loading rate on its rupture stress and strain. The creep process of the potato tuber was simulated using 4-element Burgers model to investigate its rheologic behavior. The compressive tests show that the yield limits and the rupture limits under different axial compressions of the aeroponic cultured potato tuber are lower than those of the soil cultured patato tuber with similar size. The effect of loading rate on the rupture stress of the aeroponic potato tuber structure is slight, but on the rupture strain is significant. The creep test results show that the aeroponic potato tuber appeass the obvious visco-elastic deformation and the viscous flowability. The fitted values of the element parameters in Burgers model can reflect accurately the rheologic properties of the aeroponic potato tuber, the filling precisions of the model under different axes are higher than 0.95. The obtained results provide a theoretical basis for reducing the mechanical damage of the aeropomic potato tuber in various production links.

关 键 词：农业工程 马铃薯种薯 气雾栽培 机械特性 蠕变 BURGERS模型 

分 类 号：S126[农业科学—农业基础科学]