Environmental Fatigue of Aluminum Alloy Structural Joints

摘要

The objectives, scope and technical requirements of a corrosion fatigue cooperative testing program are presented. The program assesses the effectiveness of systems for counteracting corrosion fatigue of aluminum alloy structural joints under realistic conditions, and studies corrosion fatigue process in order to obtain guidelines for development of protection systems. It also evaluates structural materials. Round robin tests on specimens, representing an aircraft structural joint, show that the influence of pre-exposure on fatigue life is less important than the effect of changing from air to salt spray tests. Thin sheets of 2024-T3 interleaved and adhesively bonded with single layers of aramide 143 (ARALL) were compared with monolithic 2024-T3 in fatigue tests. The ARALL specimens have fatigue lives 20 times those of monolithic 2024-T3.