Abstract
This paper deals with improving the fatigue strength of AA2017-T0 aluminium alloy by using laser surface treatment. A set of rotating fatigue specimens were machined and prepared for this rezone. Half number of them was surface-treated using 1 Joule laser machine. The fatigue tests for the treater and as reserved specimens were used for different loads to draw the S-N curves. It was shown that the laser treatment was improving the fatigue strength for the alloy. The effect of varying the stress amplitude through-loading life was studied. It was shown that the (high-low) loading types give a longer life than the (low-high) loading types. The results show that the thermal laser treatment of the surface of the aluminium alloy AA2017 gives higher hardness and generates compression residual stresses that improving the mechanical properties of the alloy. Comparing experimental and numerical finite element results gives a good agreement with maximum error not exceeding (9.68%).
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