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首页> 《中国测试》期刊 >本期导读>离散元聚苯乙烯颗粒细观参数辨识

离散元聚苯乙烯颗粒细观参数辨识

131    2021-09-23

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作者:庞绍锐, 杨丽红, 王双园

作者单位:上海理工大学机械工程学院,上海 200000


关键词:离散元;参数测定;聚苯乙烯颗粒;分子动力学


摘要:

真空担架由聚苯乙烯(EPS)颗粒和聚氯乙烯(PVC)软膜组成,在使用离散元法仿真研究担架真空变形机理时,颗粒的细观参数对仿真精确性至关重要。该文基于Hertz-Mindlin接触模型,利用实验结合仿真模拟的方法对颗粒离散元参数进行辨识。通过斜面滑移实验,碰撞弹跳实验测定EPS颗粒与PVC软膜之间的静摩擦因数和恢复系数,分子动力学仿真模拟方法测定出颗粒与颗粒的滚动摩擦系数,得到结果分别为:0.885、0.506、0.02。以休止角为响应值,根据最陡爬坡实验确定其余参数最佳范围,结合Box-Behnken实验建立休止角与参数的二阶回归模型,得出颗粒与颗粒的静摩擦因数为0.40,EPS颗粒与PVC软膜的滚动摩擦系数为0.45,EPS颗粒与颗粒的碰撞恢复系数为0.43。最后用测定的参数进行侧面崩塌仿真模拟,与崩塌实验休止角误差 1.9%,表明测定后的EPS细观参数可用于离散元仿真。


Mesoscopic identification of polystyrene particles based on discrete element
PANG Shaorui, YANG Lihong, WANG Shuangyuan
School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200000, China
Abstract: The vacuum stretcher is composed of polystyrene (EPS) particles and PVC (PVC) soft film. When using discrete element method to study the vacuum deformation mechanism of stretcher, the microscopic parameters of particles are very important to the accuracy of simulation.In this paper, the Hertz-Mindlin contact model is used to identify the discrete element parameters of particles. The static friction factor and recovery coefficient between EPS particles and PVC soft film were measured by slant slip experiment, and the rolling friction coefficient between particles and PVC soft film was determined by molecular dynamics simulation, and the results were 0.506, 0.885 and 0.02. The resting Angle was taken as the response value, the optimal range of other parameters was determined according to the steepest climb experiment, and the second-order regression model of resting Angle and parameters was established in combination with box-Behnken experiment. It was obtained that the static friction factor between particles was 0.40, the rolling friction coefficient between EPS particles and PVC soft film was 0.45, and the collision recovery coefficient between EPS particles was 0.43. Finally, the measured parameters were used for side collapse simulation, and the repose Angle error between the measured parameters and the real test was 1.9%, indicating that the measured EPS microscopic parameters could be used for discrete element simulation.
Keywords: discrete element;parameter determination;polystyrene particle;molecular dynamics
2021, 47(9):26-33  收稿日期: 2020-10-08;收到修改稿日期: 2020-12-16
基金项目:
作者简介: 庞绍锐(1996-),男,江苏连云港市人,硕士研究生,专业方向为先进制造技术
参考文献
[1] LIU A J, NAGEL S R. Jamming is not just cool any more[J]. Nature, 1998, 396(6706): 21-22
[2] 李祥伟, 何彦霖, 孙广开, 等. 软体心脏固定器柔性支撑臂变刚度性能分析与测试[J]. 中国测试, 2020, 46(6): 140-146
[3] 石崇, 张强, 王盛年. 颗粒流(PFC5.0)数值模拟技术及应用[J]. 岩土力学, 2018, 39(S2): 43
[4] CUNDALL P A, STRAKE O D L. Discussion: A discrete numerical model for granular assemblies[J]. Géotechnique, 1980, 30(3): 331-336
[5] GONIVA C, KLOSS C, DEEN N G, et al. Influence of rolling friction on single spout fluidized bed simulation[J]. Particuology, 2012, 10(5): 582-591
[6] 韩燕龙, 贾富国, 唐玉荣, 等. 颗粒滚动摩擦系数对堆积特性的影响[J]. 物理学报, 2014, 63(17): 173-179
[7] 王美美, 王万章, 杨立权, 等. 基于EDEM的玉米子粒建模方法的研究[J]. 河南农业大学学报, 2018, 52(1): 80-84+103
[8] 张锐. 基于离散元细观分析的土壤动态行为研究[D]. 长春: 吉林大学, 2005.
[9] 贾富国, 韩燕龙, 刘扬, 等. 稻谷颗粒物料堆积角模拟预测方法[J]. 农业工程学报, 2014, 30(11): 254-260
[10] 晏红梅. 泡沫塑料散体颗粒在动态加载下的力学性质及其在冲击能量吸收中的应用[D]. 宁波: 宁波大学, 2011.
[11] 孙其诚, 王光谦. 颗粒物质力学导论(精)[M]. 北京: 科学出版社, 2009, 30-76.
[12] 晏红梅, 余同希, 周风华. 聚苯乙烯泡沫颗粒散体和整体集合的准静态压缩力学特性[J]. 固体力学学报, 2011, 32(6): 549-556
[13] 倪佳女. PVC膜材力学性能试验研究[D]. 上海:同济大学土木工程学院, 2009..
[14] 刘羊, 宗望远, 马丽娜, 等. 采用高速摄影技术测定油葵籽粒三维碰撞恢复系数[J]. 农业工程学报, 2020, 36(4): 44-53
[15] 储时哉, 董家豪, 王思慧, 等. 无黏性颗粒在平面上的堆积角[J]. 物理实验, 2019, 39(7): 32-37+42
[16] 张锐, 韩佃雷, 吉巧丽, 等. 离散元模拟中沙土参数标定方法研究[J]. 农业机械学报, 2017, 48(3): 49-56
[17] 段凤敏, 张绍旺, 邵维炯, 等. 云南凤庆大叶种晒青茶茶多酚提取工艺优化及抗氧化研究[J]. 中国测试, 2019, 45(5): 66-73
[18] 刘彩玲, 魏丹, 宋建农, 等. 颗粒肥料离散元仿真边界参数系 统化研究[J]. 农业机械学报, 2018, 4909: 82-89