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Fonte, Manuel
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The environment effect on fatigue crack growth rates in 7049 aluminium alloy at different load ratios
Abstract
The influence of environment and microstructure is investigated on a high strength 7049 aluminium alloy sheet cold rolled and heat-treated. This aluminium alloy was artificially aged to underaged (UA) and overaged (OA) conditions. Crack growth measurements were performed at constant load ratios between –1 and 0.8 in ambient air and vacuum. The heat treatment procedure was performed in order to obtain an UA and OA microstructure having the same crystallographic texture and uniaxial yield strength properties, differing in the slip mode. The influence of load ratio is discussed in terms of deformation slip, crack branching and fracture mode. Micromechanisms of near threshold crack growth are briefly discussed for several concurrent processes involving environmentally assisted cracking with intrinsic microstructural effects.