Ivetic, G. and Meneghin, I. and Troiani, E. and Molinari, G. and Ocaña Moreno, Jose Luis and Morales Furió, Miguel and Porro González, Juan Antonio and Lanciotti, A. and Ristori, V. and Polese, Claudia and Plaisier, J. and Lausi, A.
Fatigue in laser shock peened open-hole thin aluminium specimens.
"Materials Science and Engineering: A", v. 542
An experimental study was performed in order to determine the influence of the sequence of operations on the effectiveness of Laser Shock Peening (LSP) treatment in increasing the fatigue performances of open-hole aluminium specimens. Residual stress measurements, fractographic analysis and FEM analysis were performed, indicating the presence of compressive residual stresses on the surface of the treated specimens and tensile residual stresses in the mid-section along the thickness of the specimens. Negative effects on fatigue lives were encountered on the specimens with the hole already present, while positive effect were observed in specimens in which the hole was drilled after LSP treatment. These results indicate that LSP can be a good solution for “in production” application, in which open holes are to be drilled after the LSP treatment. The application in which LSP is used “in service” on structures with pre-existing cut-outs, has proven to be impracticable in the investigated configuration.