苜蓿在直接压缩过程中的力学特性研究  

Study on Mechanical Properties in the Process of Direct Compression of Alfalfa

作　　者：李旭英[1] 张小志[1] 郭文斌[1] 康文彪[1] 丁海泉[1] 

机构地区：[1]内蒙古农业大学机电工程学院,呼和浩特010018

出　　处：《农机化研究》2014年第8期144-148,共5页Journal of Agricultural Mechanization Research

基　　金：内蒙古自然科学基金项目(2011MS0724);内蒙古农业大学科技创新团队项目(NDPYTD2010-8)

摘　　要：在多功能草物料压缩试验台上,以苜蓿干草为试验物料进行了压缩试验,研究了苜蓿在直接压缩过程中的力学特性,为降低压捆机的功耗、保证产品的密度以及压捆机的优化设计提供了依据。采用虚拟仪器分别获得直接苜蓿压缩过程中的力和位移信号,对该信号进行分析处理,获得了苜蓿在不同截面直接压缩时应力与应变的关系曲线,计算其弹性恢复率,揭示了压缩室截面积对弹性变形恢复率影响很大。试验表明,苜蓿直接压缩过程中的应力-应变关系为非线性,加载曲线与卸载曲线不同,且卸载曲线回不到原点。这表明,草物料在压缩时具有粘弹性,导致在推移、换向、卸载过程中产生应力松弛。On the multifunction compression test platform of herbage materials, taking alfalfa hay as experimental materiel, compression experiments are conducted. Mechanical property of alfalfa was studied in the process of direct compression. Therefore the aims of reducing the power consumption of the baler, ensuring the density of the product, and optimal design of the baler can be achieved with basic date. This experiment using virtual instrument respectively obtain force and the displacement signals in the process direct compression of alfalfa. By analyzing them, stress and strain curves are obtained on the direct compression of alfalfa in different sections. Recovery rate of their elasticity are also calculated,which have posted that the baling-chamber cross-sectional area have a great influence on elastic recovery ratio. Experiments show that the relationship between stress and strain is nonlinear in the process direct compression of alfalfa, and the load curve differs from the unload one which is zero offset. It shows the herbage material are viscoelastic property when compressed, which leads to produce stress relaxation during the process of push forward , reversing and unloading.

关 键 词：苜蓿 压捆 力学特性 应力应变 

分 类 号：S126[农业科学—农业基础科学] S817.115