基于FDEM的核桃冲击破壳特性研究  

Study on walnut impact breaking shell characteristics based on FDEM

作　　者：杨佳龙 毛碧琦 张宏[1,2] 苏格格 范修文[1,2] 张永成 黄睿 曾勇 YANG Jialong;MAO Biqi;ZHANG Hong;SU Gege;FAN Xiuwen;ZHANG Yongcheng;HUANG Rui;ZENG Yong(College of Mechanical and Electronic Engineering,Tarim University,Alar,Xinjiang 843300;Modern Agricultural Engineering Key Laboratory at Universities of Education Department of Xinjiang Uygur Autonomous Region,Alar,Xinjiang 843300)

机构地区：[1]塔里木大学机械电气化工程学院,新疆阿拉尔843300 [2]新疆维吾尔自治区教育厅普通高等学校现代农业工程重点实验室,新疆阿拉尔843300

出　　处：《塔里木大学学报》2025年第2期55-66,共12页Journal of Tarim University

基　　金：新疆生产建设兵团科技创新人才计划项目(2022CB008);塔里木大学研究生科研创新项目(TDGRI202250)。

摘　　要：为了从微观层面阐明核桃的冲击破壳机理,本研究通过有限元耦合离散元法与内聚力模型相结合的方式,对简化成球壳的核桃在冲击作用下的破碎过程进行数值模拟。引入损伤比和最大碎片尺寸比定量描述了冲击速度和冲击角度对破碎程度的影响,结果表明随着冲击速度的增加,球壳的破碎模式根据其破碎程度可分为未破碎、局部破碎、破碎以及完全解体四种。此外,冲击角度的变化对损伤比的影响不显著,最大碎片尺寸比在一定冲击速度范围内却受到冲击角度的显著影响,表现为随着冲击角度和冲击速度逐渐增加,最大碎片尺寸比由显著减小逐渐变为缓慢减小。模拟结果为壳类坚果破壳取仁问题研究提供参考,同时为冲击破壳取仁装备及其关键部件的优化创新提供指导。In order to reveal the impact breaking shell mechanism of walnuts at the microscopic level,numerical simulation of the breakage process of walnut simplified into spherical shell under impact was carried out by means of finite element coupled discrete element method combined with cohesive element model.Damage ratio and size ratio of largest fragment were introduced to quantitatively describe the effects of impact velocity and impact angle on the degree of spherical shell breakage.The results showed that with the increase of impact velocity,the breakage modes of spherical shell can be classified into four types according to their degree of breakage:unbroken,local breakage,fragmentation and completely disintegration.In addition,the change of impact angle has no significant effect on the damage ratio,while the size ratio of largest fragment is significantly affected by the impact angle within a certain range of impact velocity.As the impact angle and the impact velocity gradually increase,the size ratio of largest fragment gradually changes from the significant linear decrease to the slow linear decrease.The simulation results provide a reference for the study on tree nut shelling problems,and at the same time provide guidance for innovation of impact shelling equipment and its key components.

关 键 词：核桃 FDEM 冲击破碎 

分 类 号：S226.4[农业科学—农业机械化工程]