Fundamental Investigations of Fretting Fatigue : Part 6, Effects of Contact Pressure and Hardness of Materials

概要

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Fretting fatigue tests have been made about the effect of clamping pressure, p_0, and hardness of materials on the initiation of non-propagating cracks and also complete fracture under the conditions where the relative slip is fully controlled. The main results obtained are as follows. (1) Fretting fatigue strength based on the initiation of fatigue cracks, σ_<w1>, decreases linearly with the increase of p_0. (2) Fretting fatigue strength based on fracture, σ_<w2>, decreases gradually with the increase of contact pressure, and reaches a critical strength when p_0 is beyond a certain value. (3) These results in (1) and (2) are analogous to fatigue phenomena of notched specimens, when the stress concentration caused by fretting is considered. (4) When the relative slip of fretting is relatively large, σ_<w1> is affected by the susceptibility of materials to wear.
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