Page 12 - 《摩擦学学报》2020年第3期

278 摩 擦 学 学 报 第 40 卷

20 6
Dry 5 Dry
Wet
Average value of max-SFC 10 Average value of max-SFC 4 3 2
Wet
Very wet
Very wet
15

0 5 0 1
40 60 80 100 40 60 80 100
Normal force/% Normal force/%
(a) Relationship between moisture and max-SFC (b) Relationship between moisture and max-SFC
in 0 ≤ F N ≤ 1 N in 1 N ≤ F N ≤ 2 N
5 4 5 4
Average value of max-SFC 3 2 Average value of max-SFC 3 2

Dry
1
Wet
Wet 1 Dry
Very wet Very wet
0 0
40 60 80 100 40 60 80 100
Normal force/% Normal force/%
(c) Relationship between moisture and max-SFC (d) Relationship between moisture and max-SFC
in 2 N ≤ F N ≤ 3 N in F N ≥ 3 N

Fig. 8 Relationship between relative moisture and max-SFC under different ranges of normal force F N (max-SFC express
maximum static friction coefficient in here)
图 8 不同法向力范围下相对湿度和最大静摩擦系数之间关系

4
a
b
c 25
Value of a、b and c 2 0 Average value of max-SFC 20

15
10
5
0
1
2 3 60 40
4
−2 Normal force, F N /N 5 80 Relative moisture/%
40 50 60 70 80

Relative mositure/%
Fig. 10 3D relationship between moisture，normal force and

Fig. 9 Relationship between relative moisture and value of max-SFC(max-SFC express maximum static friction
parameters a，b and c coefficient)
图 9 参数a、b、c值随湿度变化关系 图 10 湿度、法向力和最大静摩擦系数3D关系图
中的参数，便可确定某湿度等级下法向力与最大静摩 此区域为最大静摩擦系数快速变化区，对湿度和法向
擦系数的关系式，为评估最大静摩擦系数大小提供依据. 力的变化均敏感.
为了综合分析湿度、最大静摩擦系数和法向力关 图10中显示法向力越小最大静摩擦系数越大，这
系，作湿度、法向力和最大静摩擦系数的3D关系趋势 一现象主要与皮肤的黏着特性有关. 根据式(4)，皮肤
图（见图10）. 图10显示相对湿度在60%附近，且F ≤2 N， 黏着力不依附于法向力，法向力较小时，但拇指接触
N