The formula for fretting wear is typically based on the Archard wear equation, which can be adapted to describe fretting conditions. The basic form of the Archard wear equation is:
π=πΎβ πΉβ π / π»
Where:
- πΒ = Volume of material worn away
- πΎΒ = Wear coefficient (dimensionless)
- πΉΒ = Normal load (force) applied to the contact surfaces
- π Β = Sliding distance or relative motion between surfaces
- π» = Hardness of the softer material in contact
In the context of fretting wear, the sliding distance π Β is often very small due to the limited oscillatory motion, but the repeated cycles can still lead to significant material removal over time.
Factors Affecting Fretting Wear:
- Material Properties: Hardness and toughness of the materials in contact.
- Surface Roughness: Smoother surfaces generally reduce fretting wear.
- Load and Frequency: Higher loads and frequencies of oscillation increase wear rates.
By understanding and controlling these factors, it is possible to reduce the extent of fretting wear and prolong the lifespan of components.