| 摘要: |
| 针对葡萄在收获、储运过程中的碰撞损伤问题，对其进行不同高度的跌落碰撞试验，采用高速摄像机拍摄碰撞过程，分析跌落碰撞速度与果实碰撞损伤程度之间的关系；进行应力松弛试验；基于ABAQUS建立葡萄果实碰撞力学模型，进行跌落碰撞仿真试验，并对其进行有限元分析，将有限元分析结果与碰撞试验结果进行比较。结果表明：当葡萄的碰撞速度从0.5 m/s增大到3 m/s时，变形量从1.1 mm增加到4.2 mm，恢复系数由0.5减少到0.4；当葡萄碰撞速度达到1.5 m/s时，果实内部开始发生较大损伤，此时内部最大碰撞应力为0.19 MPa；当碰撞速度≤1.5 m/s时，所建立的葡萄果实碰撞力学模型具有很高的精度，误差为8％。 |
| 关键词: 葡萄 跌落碰撞 粘弹性 有限元 机械损伤 |
| DOI：10.11841/j.issn.1007-4333.2018.11.19 |
| 投稿时间：2018-02-28 |
| 基金项目:现代农业产业技术体系建设专项资金资助（CARS-29） |
|
| Study on collision damage experiment of grape and finite element analysis |
|
MA Shuai, XU Liming, XING Jiejie, YUAN Quanchun, DUAN Zhuangzhuang, YU Changchang, CHEN Chen
|
| (College of Engineering, China Agricultural University, Beijing 100083, China) |
| Abstract: |
| Aiming at the collision damage during grapes harvest, storage and transportation, drop collision tests at different heights were carried out. A high-speed camera was used to record the collision process, and the relationship between the speed of collision and collision damage was analyzed. Stress relaxation test was carried out; a collision mechanics model of grape fruit based on ABAQUS was established, and the drop simulation tests were conducted and the finite element analysis was performed. The result of finite element analysis was compared with the result of collision test. The results showed that when the velocity of the grape increased from 0.5 to 3 m/s, the deformation amount increased from 1.1 mm to 4.2 mm, and the recovery coefficient decreased from 0.5 to 0.4; When the collision speed of the grape reached 1.5 m/s, its interior began to cause great damage, at this time, the maximum internal collision stress is 0.19 MPa; When the collision was no more than 1.5 m/s, the established grape fruit collision mechanics model had high accuracy with an error of 8%. |
| Key words: grape drop collision viscoelasticity finite element mechanical damage |
