摘要
使用自行设计的一种往复运动的微摩擦测试装置，考察不同介质环境下，蛇类表皮及其表皮的摩擦特性。研究结果表明：在干摩擦下，蛇向后运动时的摩擦因数是前向运动的摩擦因数的1．2—4．1倍；在液体环境下向前运动时的摩擦因数是向后运动的摩擦因数的1．2—2．55倍，表现出摩擦各向异性。液体环境下，蛇类自身的分泌物在蛇运动时形成了以边界膜和流体膜为主的混合润滑，且边界膜破裂的概率不大。当蛇表皮面由于弹性变形或其它原因使表面速度随位置而变化时因各断面的流量不同而产生压力流动，从而在液体环境下，向后运动的摩擦力逐渐减小，甚至小于向前运动的摩擦力。
The self-made reciprocate micro-friction testing device were used to analyze the bio-friction properties of typical kinds of the snake epidermis under different circumstance. It is indicated that under dry condition, the backward friction coefficient is 1.2 - 4. 1 times of the forward one ; under wet condition, the forward friction coefficient is 1.2 - 2.55 times of the backward one, which takes mixed lubrication film mainly co on friction anisotropy. Under wet condition, the secretion of the snake forms the of boundary lubrication and liquid lubrication as it moves, and the boundary film hardly cracks. Different cross-section flux causes press flow, when elastic distortion or other thing make surface velocity vary in different position on the snake epidermis. As a result,the backward friction decreases, even lowers than the forward one.
出处
《润滑与密封》
EI
CAS
CSCD
北大核心
2006年第11期56-59,共4页
Lubrication Engineering
基金
高等学校博士学科点专项基金项目(20040299001)
关键词
表皮鳞片
表面形貌
微摩擦仪
仿生摩擦
混合润滑
epidermis scales
topography
atomic force microscopy
bio-friction
mixed lubrication
