Abstract
The effect of water vapour pressure on fatigue crack growth in an aluminium alloy is analysed in this investigation. Fatigue tests were performed in gaseous atmospheres with different water vapour concentrations and the experimental results were correlated with the morphology of the fracture surfaces examined by SEM. An important effort has been made in thoroughly examining the characteristic features associated with the fatigue fracture for environments with different water vapour pressures. Crack growth response at the lower water vapour pressures (between 1 and 5 Pa) is satisfactorily explained in terms of a model based on the hypothesis of hydrogen embrittlement.
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