铸型尼龙端面扭动摩擦接触模型及实验验证  

Friction Contact Model and Experimental Investigation of MC Nylon Composite under Face-on-Face torsion

作　　者：滕兵[1,2] 王世博[1,2,3] 

机构地区：[1]中国矿业大学机电工程学院,江苏徐州221116 [2]中国矿业大学摩擦学与可靠性工程研究所,江苏徐州221116 [3]清华大学摩擦学国家实验室,北京100084

出　　处：《摩擦学学报》2014年第1期73-78,共6页Tribology

基　　金：国家自然科学基金项目(51005235和50875253)资助~~

摘　　要：基于刚性平冲头压在弹性半无限空间的理论研究,建立了玻璃纤维增强铸型尼龙(MC尼龙)复合材料与45#钢的端面扭动摩擦模型,并开展了铸型尼龙端面扭动摩擦学试验.结果表明:摩擦扭矩-角位移(T-θ)曲线随角位移幅值的增加由直线形、椭圆形最终转变为准平行四边形;纯MC尼龙及其复合材料(3%GF、5%GF)在扭动角分别为0.5°、1°和2°时,扭动接触界面处于完全滑移状态,其不同的摩擦系数直接影响黏着半径与扭动角的关系,即导致了不同的扭动界面接触机制;MC尼龙复合材料的扭矩随扭动角的增加急剧减小至稳定状态,由扭矩与扭动角的关系还可知部分滑移状态时的扭矩值高于完全滑移状态的扭矩.不同角位移下的实验扭矩与计算曲线相似,揭示了该扭动摩擦模型可近似预测MC尼龙复合材料的扭矩.Based on the theoretical study of a rigid fiat punch acting on an elastic half - space, a face - on - face torsional friction model of glass fiber reinforced monomer casting nylon （ MC nylon） against 45# steel was built. In addition, their tribological behavior was studied to validate the model. The results indicate that the shape of T - θ curves varied from linear, elliptical into quasi - parallelogram curves with increasing angular displacement. Torsional contact interface of MC nylon filled with 0% , 3% and 5% glass fiber was gross slip regimes, correspondingly under their torsional angular displacement of 0.5°, 1° and 2°. Friction coefficient directly influenced the variation of adhesion radius as a function of torsional angle, i.e. it resulted in different torsional interracial contact regimes. The torsional torque of MC nylon composite underwent a sharp decrease to stable state with increasing torsional angle. From the above - mentioned relationship, the torque of torsional contact under partial slip was higher than that under gross slip. Good agreement between the calculated torque and experimental torque was found under different angular displacements, which indicated the torsional friction model could approximately predict the torque of MC nylon composite.

关 键 词：扭动摩擦模型 T-θ曲线 摩擦系数 接触机制 

分 类 号：TH117.3[机械工程—机械设计及理论]