Reliability analysis of accelerated corrosion factor for fatigue critical components

To evaluate the fatigue life for aircraft structures in corrosive environment, the reliability analysis of accelerated factor for accelerated aging test to service or natural exposure environment on fatigue critical components is performed. The accelerated factor is defined as the ratio of service time to accelerated time corresponding to the same pre-corrosion fatigue life. According to corrosion kinetics law on the pre-corrosion fatigue life, equations for accelerated factor are established. The accelerated factor is proved to be a constant regardless of reliability degree and corrosion time. The distribution of accelerated factor estimate is gained, so the confidence intervals of accelerated factor for LY12CZ aluminum alloys specimen are obtained.