Optimization for Tribological Properties of Glass Fiber-Reinforced PTFE Composites with Grey Relational Analysis

Table 1

Design factors and their levels.

Factors	Levels
	1	2	3
Load (kg) ()	1	2	3
Speed (m/s) ()	1.7278	3.4558	5.1836
Sliding distance (km) ()	2	4	6
Mixture GF% ()	0	15	20