Abstract
The effect of water vapour pressure on fatigue crack growth in a commercial medium strength aluminium alloy is analysed in this investigation, with particular emphasis on its relation to environmental exposure. Crack growth velocities were measured in high-purity water vapour environments with pressures ranging from 10 −5 Pa to 1300 Pa and testing frequencies between 1 Hz and 10 Hz. A detailed microscopic survey of the fracture surfaces was also performed. Different types of striations were found and correlated with water vapour exposures. Experimental results agree quite well with a hydrogen embrittlement model based on the proposals by R. P. Wei and co-workers.
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