水润滑碳纤维增强聚醚醚酮滚动接触疲劳特性OA

Carbon fiber reinforced polyetheretherketone is an ideal material for water hydraulic pump friction pairs due to its high mechanical strength,corrosion resistance,and self-lubricity.Studying its rolling contact behavior under water lubrication provides new options for pump development.A micro-scale fiber-matrix model is established to simulate the internal stress distribution of carbon fiber reinforced polyetheretherketone under rolling contact.Simulation results show significant stress concentration at the fiber and interface regions.A rolling contact test bench is built,and rolling contact experiments are conducted.The contact fatigue S-N curve of carbon fiber reinforced polyetheretherketone is established at a 95％confidence level.Results show that the rolling contact fatigue life decreases significantly with increasing contact pressure,following typical material fatigue behavior.At contact stresses of 165～233 MPa,the fatigue life ranges from 2×106 to 1×107 cycles.At 135 MPa,carbon fiber reinforced polyetheretherketone exhibits excellent fatigue resistance under water lubrication.Surface damage analysis reveals that interface debonding and fiber breakage are the main failure modes.This study offers theoretical and experimental support for developing water-lubricated rolling friction pairs.