枇杷压缩试验及有限元分析

Compression test and finite element analysis of Eriobotrya japonica (Thunb.) Lindl.

中文关键词:  枇杷  压缩损伤  压缩试验  有限元分析  力学特性

英文关键词:Eriobotrya japonica (Thunb.) Lindl.  compression damage  compression test  finite element analysis  mechanical property

中文摘要:

      目的 对枇杷进行压缩试验和有限元力学仿真, 探究其压缩特性。方法 利用万能电子材料试验机对枇杷受压变形过程进行多次重复试验, 得到压缩力与变形量之间的关系曲线; 通过图像处理提取枇杷图片特征点及特征链, 构建枇杷三维数字模型; 基于ANSYS Workbench 2024 R1有限元仿真软件分析了枇杷果实受压的应力应变分布规律。结果 枇杷果实的屈服载荷为38.25 N; 有限元仿真模型与压缩试验所得的力-变形曲线基本吻合, 两者数据平均相对误差为5.93%, 证明利用有限元仿真模拟枇杷果实的压缩试验是合理有效的。得到枇杷果实挤压试验应力应变云图, 发现果实与上压盘接触的边缘处是枇杷的最大受力部位, 应力和应变的最大值为0.14057 MPa和0.52233 mm。结论 在枇杷采摘及流通过程中, 应注意机械采摘和果实堆放所产生的挤压力不应超过38.25 N以避免机械压缩损伤, 同时需要做好包装缓冲工作从而保护好枇杷挤压接触的最大受力部位。

英文摘要:

      Objective To conducte compression tests and finite element mechanical simulations on Eriobotrya japonica (Thunb.) Lindl., and investigate its compression characteristics. Methods The compression deformation process of Eriobotrya japonica (Thunb.) Lindl. was repeatedly tested by universal electronic material testing machine, and the relationship curve between compression force and deformation was obtained. The feature points and feature chains of fruits pictures were extracted by image processing, and the 3D digital model of fruits was constructed. The stress and strain distribution of its fruits under compression was analyzed based on ANSYS Workbench 2024 R1 finite element simulation software. Results The yield load of Eriobotrya japonica (Thunb.) Lindl. fruit was 38.25 N. The average relative error between the finite element simulation model and compression test was 5.93%, which proved that the compression test of its fruit was reasonable and effective. The stress-strain cloud map of fruit compression test was obtained. It was found that the maximum stress position of Eriobotrya japonica (Thunb.) Lindl. was at the edge of the contact between the fruit and the upper pressure plate, the maximum stress value was 0.14057 MPa and the maximum strain value was 0.52233 mm. Conclusion In the process of picking and circulation of Eriobotrya japonica (Thunb.) Lindl., it shall be noted that the extrusion pressure generated by mechanical picking and fruit stacking shall not exceed 38.25 N to avoid mechanical compression damage. At the same time, it is necessary to do a good job of packaging buffering to protect the maximum stress part of its fruits .