Fretting corrosion load effect

The fretting wear rate is directly proportional to the normal load for a given slip amplitude. However, in the total-slip situation, the frequency has little effect. (Water-house)88 In a partial-slip situation, the frequency of oscillation has little effect on wear rate per unit distance in the low-frequency range, whereas the increase in the strain rate at high frequencies leads to increased fatigue damage and increased corrosion due to a rise in temperature.75... 

The effect of the environment (mechanical or physico-chemical) on the crack propagation is evident. This returns us, somehow, to the notion of stress corrosion with the nuance that the cracks are induced at a mechanical loading which is not constant in the fretting test under consideration. 

Velocity effects include erosion-corrosion, a form of attack caused by high velocity flow cavitation caused at even higher flow by the collapse of bubbles formed at areas of low pressure in a flowing stream and fretting that is caused by vibratory relative motion of two surfaces in close contact under load erosion-corrosion, cavitation, fretting). 

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