摘要
梨子等水果50%的损伤都来源于机械损伤,每年因损伤会造成大量损失。为了降低损伤,减少经济损失,结合原位观测手段来探究静压对梨子的力学-结构损伤特性的影响。选取雪梨、酥梨两个品种的梨子作为研究对象,分析了压距、压速、温度的影响。对梨子的静态压缩损伤机理进行研究,建立有限元模型分析了两种梨子的应力分布与损伤特性。结果表明:压距对损伤有显著影响,在压距小于1.6 mm时梨子试样处于弹性阶段,无结构损伤;梨子能承受的压缩能为11 N·mm,损伤面积与压缩能呈正相关,有限元应力分布结果验证了试验时的损伤面积;压速对两种梨子的影响不同。试验揭示了梨子的力学结构损伤机理,可为梨子运输降损、储存参数的设定等提供明确的指导。
50% of all damage to pears and other fruits comes from mechanical damage, and it will cause huge losses every year due to damage. In order to reduce the damage and reduce economic losses, this paper investigates the effect of static pressure on the mechanical-damage behavior of structural properties of pears in conjunction with in situ observations. The experiment selected two varieties of snow pear and crisp pear as the research object. The influence of pressure distance, pressure speed, temperature were analyzed. Mechanism of static compression damage was analyzed by establishing a finite element model(FEM). Results showed that the pressure distance had a significant effect on the damage. Pear samples are in elastic stage at pressure distance less than 1.6 mm. Without structural damage, the pear can withstand the compression energy of 11 N·mm. Damage area and compression energy are positively correlated. FEM simulation results are consistent with the experimental test results of damage expansion during compression. Pressure speed has different effects on the two kinds of pears. This study reveals the mechanism of mechanical structure damage in pears. It provides clear guidelines for reducing transport losses and setting storage parameters of pears.
作者
曹振涛
杨柳
王志诚
宋少云
张永林
裴后昌
CAO Zhen-tao;YANG Liu;WANG Zhi-cheng;SONG Shao-yun;ZHANG Yong-lin;PEI Hou-chang(School of Mechanical Engineering,Wuhan Polytechnic University,Wuhan,430023,China;Hubei Grain and Oil Machinery Engineering Technology Research Center,Wuhan 430023,China)
出处
《武汉轻工大学学报》
CAS
2022年第6期37-43,共7页
Journal of Wuhan Polytechnic University
基金
湖北省教育厅科研项目(Q20211609)
武汉轻工大学博士启动科研(2019RZ08)
武汉轻工大学校杰出青年科研项目(2020J06)
江苏省食品先进制造重点实验室开放基金(FM-202103)
湖北省重点研发计划(2022BBA0047)。
