施力方向与加载速率对藠头种子力学特性的影响
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国家现代农业产业技术体系(CARS-24-D-02)


Effects of force direction and loading speed on seed mechanical properties of Allium chinense
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    摘要:

    以大叶藠(Allium chinense G.Don)为研究对象,利用质构仪对藠头种子横向X轴、侧向Y轴和纵向Z轴进行压缩与剪切试验,考察不同施力方向及不同加载速率对藠头种子力学特性的影响。试验结果显示:藠头种子X、Y、Z方向的压缩极限载荷分别为89.20~139.20、120.70~294.70、101.40~184.60 N;加载速率分别为20、40、60、80、100 mm/min时,藠头种子的弹性模量均值分别为1.65、1.07、1.89、2.01、1.85 MPa,X、Y、Z方向的弹性模量均值分别为2.65、1.30、1.13 MPa,藠头种子的切断力均值分别为20.05、12.74、11.23、14.02、16.72 N,最小切断力为6.12 N,X、Y、Z方向的切断力均值分别为11.06、18.07、15.73 N。研究结果表明,施力方向与加载速率对藠头种子的极限载荷、弹性模量和切断力均有显著影响(P<0.05),藠头种子Y方向有较好的抗挤压和抗剪切能力。

    Abstract:

    A texture analyzer was used to conduct the compression and shearing tests on the lateral X axis,lateral Y axis and longitudinal Z axis of Allium chinense seed to explore the effects of force directions and loading speed on the seed mechanical properties of Allium chinense. The results showed that the compression limit loading range of Allium chinense seed in X,Y and Z directions was 89.20-139.20,120.70-294.70 and 101.40-184.60 N,respectively. The compression shear test of Allium chinense seed was conducted at the loading speed of 20,40,60,80,and 100 mm/min. The average elastic modulus of Allium chinense seed under different loading speeds was 1.65,1.07,1.89,2.01,1.85 MPa,and the average elastic modulus of Allium chinese seed in X,Y and Z directions was 2.65,1.30 and 1.13 MPa,respectively. The mean cutting force of Allium chinense seed at different loading speeds was 20.05,12.74,11.23,14.02,16.72 N,respectively. The mean cutting force of Allium chinense seed in X,Y and Z directions was 11.06,18.07,15.73 N,respectively. The minimum cutting force of Allium chinense seed was 6.12 N.It is indicated that the force direction and loading speed have significant effects on the ultimate load,elastic modulus and cutting force. The anti-extrusion and anti-shear ability of Allium chinense seed in y direction was good. It will provide reference for studying the sowing,harvesting,transportation of Allium chinense and designing the machine and tool for Allium chinense.

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康启新,张国忠,郑侃,鄢钱,刘浩,陈亚欣.施力方向与加载速率对藠头种子力学特性的影响[J].华中农业大学学报,2021,40(4):231-238

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  • 收稿日期:2021-04-26
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  • 在线发布日期: 2021-07-22
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