Effects of laser shock processing on high cycle fatigue crack growth rate and fracture toughness of aluminium alloy 6082-T651

Bergant, Zoran (author), Trdan, Uroš (author), Grum, Janez (author)

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.

• Language: English
• Keywords: laser shock processing, fatigue crack growth, aluminium alloys, residual sresses, fracture toughness
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Submitted for review: 25.11.2015
• Article acceptance date: 16.02.2016
• Publication date: 03.03.2016
• Year: 2016
• Number of pages: Str. 444-455
• Numbering: Vol. 87
• PID: 20.500.12556/RUL-127242
• UDC: 620.178.3:669.715(045)
• ISSN on article: 0142-1123
• DOI: 10.1016/j.ijfatigue.2016.02.027
• COBISS.SI-ID: 14539035
• Publication date in RUL: 28.05.2021

Record is a part of a journal

• Title: International journal of fatigue
• Shortened title: Int. j. fatigue
• Publisher: Elsevier
• ISSN: 0142-1123
• COBISS.SI-ID: 25643520

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
• Licensing start date: 01.06.2016

Secondary language

• Language: Slovenian
• Keywords: lasersko udarno utrjevanje, rast utrujenostne razpoke, aluminijeve zlitine, zaostale napetosti, lomna žilavost