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      2. 不同成熟度蓮籽力學特性試驗
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        國家特色蔬菜產業技術體系專項(CARS-24-D-02)


        Mechanical properties of lotus seeds with different maturity
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          摘要:

          以產自湖北洪湖的太空蓮36號蓮籽為研究對象,測定不同成熟度蓮籽外形尺寸和含水率,并進行力學特性試驗。結果顯示:乳熟期、蠟熟期、完熟期蓮籽縱橫徑比平均值分別為1.35、1.28、1.19,含水率分別為79.84%、70.28%、57.72%,蓮籽長軸彈性模量分別為1.09、1.22、1.85 MPa,短軸彈性模量分別為1.33、1.42、2.16 MPa;3種不同成熟度蓮籽極限破壞載荷分別為81.995、117.107、167.640 N。研究結果表明,蓮籽同一成熟度和剪切深度條件下,剪切力不隨剪切速率改變;蓮籽同一成熟度和剪切速率條件下,剪切力與剪切深度呈顯著線性相關;蓮籽在X、Y、Z軸方向上的壓縮破殼力隨著成熟度的增加而增加;相同成熟度下,蓮籽三軸方向上的壓縮力在數值上X軸

          Abstract:

          Lotus seeds with different maturity have different mechanical properties. At present,shelling machinery is only suitable for lotus seeds after ripening stage. However,the crushing rate increases greatly when milk and wax ripening stages of lotus seeds are shelled. In order to improve the applicability of shelling machinery and reduce the crushing rate of fresh lotus seeds in the process of shelling and peeling,the compression,crushing and shearing characteristics of lotus seeds with different maturity were studied. In this study,the lotus seeds of space lotus No. 36 from Honghu Lake,Hubei Province were used to measure the shape dimensions and water content. The long-axis and short-axis compression and the crush test for whole lotus seed were conducted. The shear test under different speeds and depths,and the compression test in three-axis direction were carried out. The elastic modulus of lotus shell was tested. The long axis and short axis elastic modulus were analyzed and calculated based on experiments above. The ultimate failure load,the relationship between shear stress and depth,speed and maturity were obtained. The results showed that the average longitudinal and transverse ratio of the lotus seeds with milk maturity,wax maturity and maturity was 1.35,1.28,1.19,respectively. The water content was 79.84%,70.28%,57.72%,respectively. The long axis elastic moduli of lotus seeds were 1.09 MPa,1.22 MPa,and 1.85 MPa,respectively. The short axis elastic moduli were 1.33 MPa,1.42 MPa,and 2.16 MPa,respectively. The limit damage load of three maturity lotus seeds was 81.995 N,117.107 N,and 167.640 N,respectively. Under the same maturity and shear depth,the shear force did not change with shear speed and was linearly correlated with shear depth. The compression shelling force of lotus seed in the X,Y and Z directions increases with maturity. The compressive force in the three-axis direction of the lotus seed is numerically X axis

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        侯群喜,曾榮,張國忠,萬志華,王洋,董昭.不同成熟度蓮籽力學特性試驗[J].華中農業大學學報,2020,39(5):159-166

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        • 收稿日期:2019-09-24
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        • 在線發布日期: 2020-10-05
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