Study of improvement of fatigue strength safety and weight reduction by laser peening treatment in aircraft component materials

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It is very useful for the reducing of weight and the energy reduction, and the high efficiency to improve the fatigue strength reliability of machines and structures by giving high functional property. In the present study, the laser peening(LP) treatment is performed on aircraft component materials such as Al alloy, Ti alloy and stainless steels. And it is the proposes of the research to improve the fatigue strength reliability and to make clear the mechanism of the improvement. The main results are as followings, (1)In all materials used in this study, it is confirmed to improve the fatigue strength by the LP treatment, and it is clear that the improvement effects are induced from the high compressive residual stress and the strain hardening in the surface layer of the materials by the LP treatment. The restrained effects for fatigue crack propagation process are improve the pre-cracked materials by the LP treatment. And, these effects are also induced from the compressive residual stress and the crack closure effects by plastic deformation near crack tip by the LP treatment. From these results, it is clear that the LP treatment is very useful for the fatigue strength reliability improvement and the weight reduction of the aircraft component materials and other machines and structures.