EFFECT OF RELATIVE SLIP AMPLITUDE ON FRETTING FATIGUE OF HIGH-STRENGTH STEEL

The effect of relative slip amplitude on fretting fatigue in high stre ngth steel was studied at various contact pressures using fretting pad s of various lengths. Under a given contact pressure. the fretting fat igue life showed a minimum at a certain relative slip amplitude. Under a fixed pad length, the life also showed a minimum at a certain conta ct pressure. A map of fretting fatigue life versus contact pressure an d relative slip amplitude was obtained using the data of this study. T he map indicated that both the phenomena which showed a minimum life i n relation to slip dependence and contact pressure dependence were the same, as were the underlying mechanisms. The minimum life was interpr eted in terms of local stress concentration at the fretted area.