颗粒流润滑力链演变及动力学状态的研究

孟凡净 1; 刘焜 2; 秦涛 1

doi:10.7652/xjtuxb201709015

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颗粒流润滑力链演变及动力学状态的研究

更新时间：2025-07-09

- 颗粒流润滑力链演变及动力学状态的研究
- Research on the Force Chain Evolution and Dynamic State of Granular Flow Lubrication
- 西安交通大学学报 2017年51卷第9期页码：106-111+158
- 作者机构：
  
  湖北文理学院机械与汽车工程学院,湖北,襄阳,441053
- 作者简介：
- 基金信息：
  
  : 2017-02-16。作者简介: 孟凡净(1981—),男,博士,副教授。基金项目: 国家自然科学基金资助项
- DOI：10.7652/xjtuxb201709015
  中图分类号： TH117
- 网络首发：2017-09-10，
  
  纸质出版：2017
- 稿件说明：
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孟凡净 1, 刘焜 2, 秦涛 1. 颗粒流润滑力链演变及动力学状态的研究[J]. 西安交通大学学报, 2017,51(9):106-111+158.

Research on the Force Chain Evolution and Dynamic State of Granular Flow Lubrication[J]. 2017, 51(9): 106-111+158.
孟凡净 1, 刘焜 2, 秦涛 1. 颗粒流润滑力链演变及动力学状态的研究[J]. 西安交通大学学报, 2017,51(9):106-111+158. DOI： 10.7652/xjtuxb201709015.

Research on the Force Chain Evolution and Dynamic State of Granular Flow Lubrication[J]. 2017, 51(9): 106-111+158. DOI： 10.7652/xjtuxb201709015.

摘要

为了研究颗粒流润滑状态下的力链演变及动力学状态

基于非连续介质力学的离散单元法理论建立了剪切平行板间颗粒流润滑的分析模型

并利用该分析模型研究了颗粒流润滑的接触力分布规律、力链网络的演变规律及动力学状态、力链的分布及对颗粒流润滑系统的影响。数值分析结果表明

颗粒润滑介质间的法向接触力、切向接触力和接触力分布均按幂函数规律变化

颗粒流润滑系统的承载和动力学特性主要受法向接触力的影响; 颗粒润滑介质的动力学状态可以转变为阻塞态、准静态流、慢速流和快速流4种状态

在4种不同的动力学状态下

总力链的大小在阻塞态、准静态流和慢速流时较大

而在快速流时则较小; 在颗粒润滑介质的动力学状态从快速流转变为慢速流和准静态流时

弱力链的数目明显减少

超强力链和强力链的数目明显增加

与此同时

颗粒润滑介质的流动速度和力链解构与重构的速度则明显减缓。

Abstract

To reveal the force chain evolution and dynamic state under granular flow lubrication

an analytical model of granular flow lubrication between sheared parallel plates is established based on the discrete element theory of continuum mechanics. Using this analytical model

the contact force distribution rule

the force chain evolution rule and dynamic state

as well as the force chain distribution and its influence on the granular flow lubrication system

are studied. Numerical analytical results show that the probability distributions of normal contact force

tangential contact force

and contact between granular lubrication medium all obey the power law; the load bearing and dynamic characteristics of granular lubrication system are mainly influenced by normal contact force; and the dynamic state of granular lubrication medium can be transformed into four states of jamming state

quasi-static state

slow flow and fast flow. Under these four flow states

the magnitude of total force chain is large in the jamming state

quasi-static state and slow flow state

but small in the fast flow state. When the dynamic state of granular lubrication medium transforms from fast flow state to slow flow state or quasi-static state

the number of weak force chains is deceased and the number of strong and super force chains is increased. And in the meantime

the flow speed of granular lubrication medium as well as the deconstruction and reconstruction speeds of force chains slows down.

关键词

Keywords

references

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