Fatigue in laser shock peened open-hole thin aluminium specimens

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:534

Article

Ivetic, Goran¹  Meneghin, Ivan¹  Troiani, Enrico¹  Molinari, Gianluca¹  Ocana, Jose²  Morales, Miguel²  Porro, Juan²  Lanciotti, Agostino³  Ristori, Vjola³  Polese, Claudia⁴  Plaisier, Jasper⁵  Lausi, Andrea⁵ 

[1] Univ Bologna, Forli, Italy

[2] Univ Politecn Madrid, Madrid, Spain

[3] Univ Pisa, I-56100 Pisa, Italy

[4] Univ Witwatersrand, ZA-2050 Johannesburg, South Africa

[5] Elettra Synchrotron Light Lab, Trieste, Italy

关键词: Laser shock peening;    Aluminium alloys;    Synchrotron X-ray diffraction;    Fatigue;    Finite element method;   

DOI  :  10.1016/j.msea.2011.12.010

来源: Elsevier

【 摘 要 】

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. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

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