Abstract: A reliability analysis method on the fatigue lives of interference fit or coldworking strengthened parts is presented. This method can be used to analyse the effects ofdifferent toler- ances and strengthening parameters on the fatigue life distributions. On the assumption that the fatigue lives of the strengthened parts which have some theoretical strengthening parameters are fitted to logarithmic normal distribution or Weibull distribution,a formulation is deduced, with which the probability of fatigue lives of the strengthened parts greater than a given value can be gained.A group of test data is treated as an example The obtained results show that both the in- terference-fit parameters and the tolerances have significant effects on the distribution of the fa- tigue lives,especially the tolerances,which are very diffcult to control in the actual production. and it is necessary to pay much attention to them.

Key words: interference一fit strengthening, voldworked hole strengthening, reliability analysis