摘要
采用原子力显微镜观察缅甸蟒蛇腹鳞表面的微观结构,采用UMT-2型摩擦磨损试验机研究不同载荷及运动方向的腹鳞表面的宏观摩擦各向异性,建立了摩擦运动的接触模型,分析了腹鳞表面的磨损机理.结果表明:腹鳞表面的微观结构由指状微突体和板结构部分周期排列而成,其结构可用9个特征参数定量描述;腹鳞表面摩擦力由分子作用力、表面微突体的犁沟力、楔形作用力以及材料弹性滞后共同引起;腹鳞表面的摩擦系数在0.07左右并与运动方向有关,摩擦系数随载荷增加而减小;后向运动及左、右侧向运动时摩擦系数基本相等,比前向运动时高33%左右;腹鳞表面微突体不同方向上倾斜角度的差异是引起摩擦各向异性的主要原因.研究结果对仿生制造摩擦各向异性表面提供实验依据.
Microstructure of Burmese python＇ s ventral scale Surface was observed with atomic force microscope （AFM）. The frictional anisotropy of Burmese Python＇ s ventral scale Surface under different loading and moving directions were investigated by UMT-2 universal micro materials tester. The contact model of friction was established, and the frictional mechanism of the ventral scale surface was analyzed. The results show that the microstructure of ventral scale for python was composed of micro-convex and plank structure that was periodically arranged, it was mensurable and could be described by 9 characteristic parameters. Its surface was different in their forward and backward lean angle. The frictional coefficient of the ventral scale had closely relationship with moving direction, it decreased with the increasing load. The value of the frictional coefficient was about 0.07. The frictional coefficient while python moved backward and laterally were equal, and that was 33% more than that moved ahead. The frictional force of the ventral scale surface was caused by mechanical tooth function of micro-convex, acting intermolecular force and material＇ s elastic hysteresis. The difference of forward and behind bevel for microconvex was the anisotropy reason of frictional force. The results provide theoretical proof for the manufacturing of friction anisotropy surface.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2007年第4期362-366,共5页
Tribology
基金
高等学校博士学科点专项科研基金资助项目(20040299001)
关键词
缅甸蟒蛇
腹鳞
微观结构
摩擦系数
磨损机理
各向异性
burmese python, ventral scale, microstructure, friction coefficient, wear mechanism, anisotropy
