油菜茎杆弹性模量的测定

为了减小油菜联合收割机收获损失,改进设计三点弯曲试验方法,利用霍尔杨氏模量测定仪测量试样弯曲时传感器信号输出值ΔU和读数显微镜测量到的标志线位置的变化值Δy,得到其静态特性曲线,完成对霍尔传感器的定标。再以不同含水率的＂湘杂油743＂成熟期茎秆为试验材料,通过测定茎秆弯曲时所加的砝码质量和霍尔弹氏模量测定仪标线位移,利用最小二乘原理进行线性拟合,得到斜率k值。结合推导出的茎秆弯曲力学模型中中点挠度与弹性模量的关系式,测定茎秆的弹性模量,并对实验结果进行了误差分析。试验结果表明：油菜茎秆的弹性模量随茎秆含水率的减小有所增大。规定含水率大于80%的茎杆为湿茎杆,含水率小于80%的茎杆为干茎杆,则成...

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Published in实验室研究与探索 Vol. 34; no. 1; pp. 38 - 41
Main Author 任述光 吴明亮 谢方平 官春云
Format Journal Article
LanguageChinese
Published 湖南农业大学工学院,湖南长沙410128 2015
湖南省现代农业装备工程技术研究中心,湖南长沙410128%湖南农业大学油料作物研究所,湖南长沙,410128
Subjects
含水率
弹性模量
油菜茎杆
误差分析
油菜茎杆
弹性模量
error analysis
elastic modulus
含水率
rapeseed stalks
误差分析
moisture content
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ISSN1006-7167

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Summary:为了减小油菜联合收割机收获损失,改进设计三点弯曲试验方法,利用霍尔杨氏模量测定仪测量试样弯曲时传感器信号输出值ΔU和读数显微镜测量到的标志线位置的变化值Δy,得到其静态特性曲线,完成对霍尔传感器的定标。再以不同含水率的＂湘杂油743＂成熟期茎秆为试验材料,通过测定茎秆弯曲时所加的砝码质量和霍尔弹氏模量测定仪标线位移,利用最小二乘原理进行线性拟合,得到斜率k值。结合推导出的茎秆弯曲力学模型中中点挠度与弹性模量的关系式,测定茎秆的弹性模量,并对实验结果进行了误差分析。试验结果表明：油菜茎秆的弹性模量随茎秆含水率的减小有所增大。规定含水率大于80%的茎杆为湿茎杆,含水率小于80%的茎杆为干茎杆,则成熟期油菜湿茎杆弹性模量平均值约为（169±3）MPa;干茎杆弹性模量平均值约为（186±3）MPa。
Bibliography:REN Shu-guang;WU Ming-liang;XIE Fang-ping;GUAN Chun-yun（1.College of Engineering, Hunan Agricultural University, Changsha 410128, China; 2. Hunan Modern Agricultural Equipment Engineering and Technology Research Center, Changsha410128, China; 3. Oil Crops Research Institute of Hunan Agrieultural University, Changsha 410128, China）
rapeseed stalks; elastic modulus; moisture content; error analysis
31-1707/T
Taking ＂Xiang mixed oil 743＂mature stalks as test materials,the paper designed test method which uses the Hall Young＇s modulus tester as tool,the elastic modulus E of rape stem of different moisture contents were measured,and both the experiment result and the error were analyzed. The results showed that the rape stem of the elastic modulus increases with the reduction of moisture content of stem. It is specified that stem is wet if moisture content is greater than80%,and dry if moisture content is less than 80%. As a conclusion the mature rape wet stem modulus of elasticity is about 169 MPa,dry stem modulus o
ISSN:1006-7167