Abstract
A fretting fatigue test machine to investigate the fretting fatigue properties of ceramic materials under cyclic loading condition was designed and fabricated. In the test machine, piezo electric bimorphs were used as actuators for cyclic loading and fretting motion. Fretting fatigue tests under static and cyclic loading conditions were carried out using HIP-sintered silicon nitride. From the experimental results, it was found that the effect of cyclic loading on fretting fatigue strength of silicon nitride was almost negligible, and fretting fatigue strengths under two test conditions were identical. A fretting crack was initiated at the very early stage of fatigue life at the position where the friction force is maximum, in accordance to Mindlin's theory. Fretting fatigue life prediction based on fracture mechanics was successfully carried out.
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