Performance Deregulation Rule of Aircraft Fatigue Critical Components in Consideration of Calendar Environment

摘要

The 2A12-T4 aluminum alloy specimens were studied with accelerated environment test to simulate different parking calendar years.Afterwards,these specimens were implemented with fatigue test to fracture.Through analyzing the test data,the relationship between S-N shape parameter and parking calendar years was caculated with dynamic S-N curve method.Then,the performance deregulation rule of aircraft fatigue critical components in consideration of calendar environment was established.In addition,the rule between Detail Fatigue Rating (DFR) and parking time was also set up.Compared with the similar specimens' life from retired aircraft,the life with S-N curve and DRF method was in good agreement with actual value.The result shows that aircraft fatigue cirtical components' performance declines with the prolonging parking calendar time.