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不同成熟度荷叶力学特性试验研究
王洋,张国忠,涂鸣,侯群喜,董昭
0
(华中农业大学工学院,武汉 430070; 农业农村部长江中下游农业装备重点实验室,武汉 430070)
摘要:
为减少撒肥机藕田作业时肥料颗粒在被高速抛出以及下落过程中对荷叶造成的冲击损伤,对不同成熟度荷叶的力学特性进行了研究。以“鄂莲一号”荷叶为对象,利用质构仪以成熟度、部位和方向为因素进行了拉伸、穿刺全因素试验,利用ANSYS软件对荷叶拉伸与肥料冲击过程进行了仿真。结果表明:荷叶弹性模量为2.53~7.45 MPa,最大拉力为2.65~5.02 N,取样部位对弹性模量影响极显著,成熟度对弹性模量影响显著,拉伸方向对弹性模量影响不显著;荷叶表面能够承受的最大穿刺力为0.86~1.3 N,取样部位对抵抗穿刺能力影响显著,成熟度对抵抗穿刺能力影响不显著;拉伸仿真试验中荷叶断裂前的拉伸曲线与实际拉伸曲线最大、最小误差为14%和3%,根据冲击仿真试验结果推测的荷叶破坏形式与实际撒肥试验中荷叶破损情况较一致。研究结果可为荷叶加工利用以及藕田撒肥机的设计提供参考。
关键词:  荷叶成熟度  拉伸  穿刺  拉伸仿真  冲击仿真
DOI:10.13610/j.cnki.1672-352x.20210909.018
基金项目:国家特色蔬菜产业技术体系专项(CARS-24-D-02)资助。
Experimental study on mechanical properties of lotus leaves with different maturity
WANG Yang,ZHANG Guozhong,TU Ming,HOU Qunxi,DONG Zhao
(College of Engineering, Huazhong Agricultural University, Wuhan 430070; Key Laboratory of Agricultural Equipment in the Middle and Lower Yangtze River, Ministry of Agriculture and Rural Areas, Wuhan 430070)
Abstract:
In order to reduce the impact damage to lotus leaves caused by fertilizer particles thrown out at high speed and falling during lotus field operation by fertilizer spreader, the mechanical properties of lotus leaves with different maturity were studied in this paper. Taking the lotus leaf of "Erlian No.1" as the object, the tensile test and puncture full factor test were carried out by using texture analyzer with maturity, position and direction as factors, and the process of lotus leaf tensile and fertilizer impact was simulated by using ANSYS software. The results showed that the elastic modulus of lotus leaf was 2.53 MPa—7.45 MPa, the maximum tensile force was 2.65 N ~ 5.02 N, the sampling position had an extremely significant effect on the elastic modulus, the maturity had a significant effect on the elastic modulus, and the tensile direction had no significant effect on the elastic modulus; the maximum puncture force on the lotus leaf surface was 0.86 N—1.3 N. The sampling position of lotus leaf had significant effect on puncture resistance, but the maturity had no significant effect on puncture resistance.The maximum and minimum errors between the tensile curve before lotus leaf fracture in ANSYS tensile simulation test and the actual tensile curve are 14% and 3%.In the impact simulation test, the damage form of lotus leaf inferred from the simulation results is consistent with that in the actual fertilizer spreading test.The research results can provide reference for lotus leaf processing and lotus field fertilizer spreader design.
Key words:  lotus leaf maturity  stretching  puncture  stretch simulation  impact simulation

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