Journal
INTERNATIONAL JOURNAL OF FATIGUE
Volume 87, Issue -, Pages 444-455Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.02.027
Keywords
Laser shock processing; Fatigue crack growth; Aluminium alloy; Residual stresses; Fracture toughness
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The effects of laser shock processing without protective coating on high-cycle fatigue crack growth and fracture toughness were investigated. Laser shock peening treatment was performed on compact tension specimens from both sides perpendicular to the crack growth direction, followed by subsequent grinding. Fatigue crack growth tests were performed at frequencies between 116 and 146 Hz, at R = 0.1 and a constant stress intensity range during the fatigue crack initiation phase and K-decreasing test. A lower number of cycles was required to initiate a fatigue precrack, and faster fatigue crack growth was found in tensile residual stress field of LSP-treated specimens. The crack growth threshold decreased by 60% after LSP treatment. The fracture toughness decreased by 28-33% after LSP treatment. The fatigue-to-ductile transition boundary on fractographic surfaces show linear fatigue crack fronts in non-treated specimens and curves after LSP treatment. (C) 2016 Elsevier Ltd. All rights reserved.
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