冬枣压缩特性实验与计算仿真研究

doi:10.7506/spkx1002-6630-201717004

食品科学 ›› 2017, Vol. 38 ›› Issue (17): 20-25.doi: 10.7506/spkx1002-6630-201717004

冬枣压缩特性实验与计算仿真研究

彭俊1，谢洪起1，冯亚利1，傅隆生1,2,*，VáZQUEZ-ARELLANO Manuel3，李瑞1

1.西北农林科技大学机械与电子工程学院，陕西杨凌 712100；2.农业部农业物联网重点实验室，陕西杨凌 712100；3.霍恩海姆大学农业工程研究所，德国巴符斯图加特 70599

出版日期:2017-09-15 发布日期:2017-09-12
基金资助:
国家自然科学基金青年科学基金项目（31301242）；中国博士后科学基金项目（2015M572602）；陕西省重点研发计划一般项目-农业领域（2017NY-164）；西北农林科技大学国际科技合作种子基金项目（A213021505）

Experimental and Simulation Studies on Mechanical Properties of Jujube (Zizyphus jujuba Mill. cv. Dongzao)

PENG Jun1, XIE Hongqi1, FENG Yali1, FU Longsheng1,2,*, VáZQUEZ-ARELLANO Manuel3, LI Rui1

1. College of Mechanical and Electronic Engineering, Northwest A & F University, Yangling 712100, China;2. Key Laboratory of Agricultural Internet of Things, Ministry of Agriculture, Yangling 712100, China;3. Institute of Agricultural Engineering, University of Hohenheim, Stuttgart 70599, Germany

Online:2017-09-15 Published:2017-09-12

摘要/Abstract

摘要： 为了研究冬枣果实在收获、分选、运输及贮藏过程的力学特性，对冬枣果实进行压缩实验和有限元仿真，分析不同成熟度白熟期和脆熟期冬枣在不同压缩方向下的弹性模量以及接触应力。压缩实验结果表明：白熟果实的破裂力大于脆熟果实；二者的压缩曲线相似，横向压缩曲线有较明显的生物屈服点，纵向压缩时没有明显的屈服点。横向压缩时，白熟果实的平均弹性模量计算值与仿真值分别为3.527 MPa和3.263 MPa，平均误差为11.38%；脆熟果实的平均弹性模量计算值与仿真值分别为3.131 MPa和2.877 MPa，平均误差分别为12.96%。纵向压缩时，白熟和脆熟果实的弹性模量计算值与仿真值平均误差分别为26.24%和27.66%。压缩应力云图显示：上压头接触面的最大应力大于与固定底板接触面的最大应力；横向压缩时，上下表面的接触应力呈现对称分布；相同的压缩方向，白熟果实的计算最大应力和仿真最大应力都大于脆熟果实；最大应力的计算值和仿真值的误差较大，最小平均误差为26.24%。研究结果可为冬枣运输、分级及贮藏过程中选择合适的包装设计和摆放方式提供理论参考。

关键词: 冬枣, 压缩特性, 弹性模量, 有限元仿真

Abstract: Compression test and finite element method (FEM) simulation were conducted to investigate the compression properties of jujube fruits (Zizyphus jujuba Mill. cv. Dongzao) at different ripening stages. The study aimed at reducing mechanical damage at harvest and during postharvest sorting, transportation and storage. The elastic moduli and contact stress of jujubes harvested at the white maturity and crisp maturity stages were measured under compression in two directions. From the experiment data, it was observed that the rupture force of white maturity fruits was greater than that of crisp maturity fruits in both transverse and vertical compression directions. The force-deformation curves of white maturity and crisp maturity fruits were similar, with obvious bioyield point under transverse compression rather than under vertical compression. Under transverse compression, elastic modulus predicted by the standard established by the American Society of Agricultural Engineering (ASAE) was in agreement with that evaluated by FEM simulation. The average apparent elastic modulus of white maturity fruits predicted by the ASAE standard and evaluated by FEM simulation were 3.527 and 3.263 MPa, respectively with an average relative difference of 11.38%, while those of crisp maturity fruits predicted by the ASAE standard and evaluated by FEM simulation were 3.131 and 2.877 MPa, respectively with an average relative difference of 12.96%. However, there was a larger difference between the elastic modulus predicted by the ASAE standard and that determined through FEM simulation under vertical compression, which was 26.24% and 27.66% for white and crisp maturity fruits, respectively. These results can provide a theoretical basis for packaging design and stacking for transportation, grading and storage.

Key words: Dongzao jujube, compression properties, elastic modulus, finite element method

中图分类号:

TS255

彭俊，谢洪起，冯亚利，傅隆生，VáZQUEZ-ARELLANO Manuel，李瑞. 冬枣压缩特性实验与计算仿真研究[J]. 食品科学, 2017, 38(17): 20-25.

PENG Jun, XIE Hongqi, FENG Yali, FU Longsheng, VáZQUEZ-ARELLANO Manuel, LI Rui. Experimental and Simulation Studies on Mechanical Properties of Jujube (Zizyphus jujuba Mill. cv. Dongzao)[J]. FOOD SCIENCE, 2017, 38(17): 20-25.

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冬枣压缩特性实验与计算仿真研究

Experimental and Simulation Studies on Mechanical Properties of Jujube (Zizyphus jujuba Mill. cv. Dongzao)

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