芒草力学特性与微观结构研究(农业工程)(选题审批表,任务书,开题报告,中期检查表,论文设计说明书17600字)
摘 要：以湘杂芒2号、湘杂芒3号、芒/南荻杂交种、2年生南荻无性繁殖苗和3年生南荻种子苗为试验对象，进行切割、顺纹压缩和横纹压缩试验，研究芒草茎秆力学性能。并观察了芒草茎杆微观结构，得到了茎杆扫描电镜下的解剖构造图像。结果表明：锯齿形刀的切割力比光刀的切割力小；切割方式以滑切最省力。横纹的强度极限明显小于立压，顺纹抗压性能最好。芒草茎杆是由无数大小不同功能各异的细胞组成，是一种典型的不连续多孔的空心各向异性材料，由厚壁机械组织、维管束和基本组织三部分组成。
关键词：芒草；切割；压缩；力学性质
Study On The TALL Miscanthus Anderss Microscopic structure and Mechanical properties
Abstract：Taking Xiangzamang NO.2,Xiangzamang NO.3, Miscanthus/Nandi cenospecies, biennial Nandi apogamic seedling and triennial Nandi seeding bud as experimental subjects, carrying on mechanics index mensuration and laws of related variations research such as different internode moisture content, outside diameter, original area of section, cross sectional moment of inertia of haulm, peak load, elasticity modulus, bending rigidity ,in order to explore how the physical and mechanical properties of miscanthus impact upon the process of misanthus incision. And observed the grass stems, microstructure, obtained the stem anatomy image under scanning electron microscope.The results showed that: serrated knife cutting force than the scalpel cutting force is small; cutting means to sliding cutting the most effort.Transverse strength was significantly smaller than the set pressure, compressive performance of the best.Grass stem is composed of numerous different functions of different cell components, is a kind of typical discontinuous porous hollow anisotropic material, composed of thick wall mechanical tissue, vascular and basic organization is composed of three parts.
Key words: Miscanthus; Stalk; bending; Mechanical properties
目 录
摘 要……………………………………………………………………………………1
关键词…………………………………………………………………………………1
1 前言………………………………………………………………………………2
2 问题提出…………………………………………………………………………3
2.1 芒草的经济价值……………………………………………………………3
2.2 研究目的……………………………………………………………………4
2.3 国内外研究现状……………………………………………………………4
3 实验内容……………………………………………………………………………6
3.1试验前准备……………………………………………………………………6
3.1.1试验前应考虑的问题………………………………………………6
3.1.2研究内容……………………………………………………………6
3.1.3试验计划及相关要求………………………………………………6
3.2 芒草剪切性试验……………………………………………………………7
3.2.1试验材料……………………………………………………………7
3.2.2试验设备……………………………………………………………7
3.2.3试验结果与分析……………………………………………………8
3.3 芒草压缩性试验…………………………………………………………15
3.3.1 试验方法与设备…………………………………………………15
3.3.2 试验结果与分析…………………………………………………16
3.4 芒草茎杆的微观结构与力学性能………………………………………23
3.4.1 试验方法与设备…………………………………………………23
3.4.2 芒草茎杆横截面解剖构造的基本特征…………………………24
3.4.3 芒草茎杆的组织结构与力学性能………………………………25
4 结论与讨论………………………………………………………………………26
参考文献 ……………………………………………………………………………26
致谢……………………………………………………………………………………27
附录……………………………………………………………………………………28
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