微观天然橡胶摩擦性能研究  

Friction mechanism for natural rubber at micro level

作　　者：柳春洋 何燕[1] 

机构地区：[1]青岛科技大学机电工程学院热能工程山东省重点实验室,山东青岛266061

出　　处：《弹性体》2016年第4期10-14,共5页China Elastomerics

基　　金：国家自然科学基金项目(51276091);山东省自主创新及成果转化专项(201422CX01503)

摘　　要：采用分子动力学方法模拟了刚性探头在天然橡胶基底表面滑动摩擦过程,利用模型体积随温度变化关系求得玻璃化转变温度(Tg)。重点讨论了探头与基底作用方式、温度以及滑动速度对摩擦过程的影响。结果表明,相比于强排斥作用,强黏着作用下基底对探头存在黏着力,在探头受到相等载荷时会获得更大的压入深度,加剧磨损,同时阻碍了探头切向运动,需要增大切向力平衡;温度低于Tg时,温度越低磨损程度越大,摩擦力变化趋势正相反;温度高于Tg时,摩擦力随温度升高而下降,磨损加剧;滑动速度增加,基底形变阻力增大,接触区域摩擦热无法及时释放,材料硬度降低,摩擦力小幅上升,表面磨损加剧。In this passage,we investigate the friction property of natural rubber （NR） with a rigid probe through molecular dynamics.The glass-transition temperature（Tg） is examined by the relation between volume and temperature.The effects of function between probe and base, temperature and ve- locity are investigated.The results showed that：with the function of adhesion, the probe obtains an extra adhensive force,which leads to deeper depth, more serious wear and bigger tangential force; below Tg,with temperature decreasing the degree of wear becomes more serious,the friction shows decrea- sing trend;above Tg, with temperature increasing, the model is much easier to deform, which need smaller friction,and the covalent bonds of NR moleculars within the model are broken more easily at higher temperature,which leads to a more serious wear; larger velocity leads to larger resistance to deformation and higher temperature in contact region： friction and normal load remain steady with a slight increase, and the wear of surface is more serious.

关 键 词：天然橡胶 分子动力学 摩擦力 磨损程度 

分 类 号：TB324[一般工业技术—材料科学与工程]