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. In 1978, the plane landed at OSAKA airport, and then the tail of body get bumped against on the runfield and repaired.The wrong repair was occured in the joint of upper half and lower half parts of pressure bulkhead for about one meter. This place should be connected by double riveted joint. But the work was done by single rivet joint because the workers had no expertknowledge.This experimental study was carried out to confirm strength of single riveted joint. In case of faying surface seal do not paste, the fatigue strength of riveted joints increases linearly for the diameter of upset head. When faying surface seal was usedand a diameter of upset head was less than 6.5 mm the fatigue strength of joints decrease about 1/ 3 for not used faying surface seal. By this tendency, it can be estimate that the pressure wall accident was conducted.The working management should be circumspective, that is, the double rivet joint does not make the single rivet joint. It can be say that it must be added the item measuring diameter of upset head.