Fatigue strength of 2024 PC-T3 aluminum sheet lap-splice joint

摘要

A jumbo jet airplane crashed in Japan. August 1985.Total 524 men snd women boarded and only 4 women survived. In1978, the plane landed at OSAKA airport, and then the tail of bodyget bumped against on the runfield and repaired.The wrong repair was occurred in the joint of upper half andlower half parts of pressure bulkhead for about one meter. Thisplace should be connected by double riveted joint. But the workwas done by single rivet joint because the workers had no expert knowledge.This experimental study was carried out to confirm strength ofsingle riveted joint. In case of faying surface seal do not paste, thefatigue strength of riveted joints increases linearly for the diameterof upset head. When faying surface seal was used and a diameter ofupset head was less than 6.5mm the fatigue strength of jointsdecrease about 1/3 for not used faying surface seal. By thistendency, it can be estimate that the pressure wall accident was conducted.The working management should be circumspective, that is, thedouble rivet joint does not make the single rivet joint. It can be saythat it must be added the item measuring diameter of upset head.