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

Abstract

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.

Keywords

lasersko udarno utrjevanje;rast utrujenostne razpoke;aluminijeve zlitine;zaostale napetosti;lomna žilavost;laser shock processing;fatigue crack growth;aluminium alloys;residual sresses;fracture toughness;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL FS - Faculty of Mechanical Engineering
UDC: 620.178.3:669.715(045)
COBISS: 14539035 Link will open in a new window
ISSN: 0142-1123
Views: 348
Downloads: 155
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: lasersko udarno utrjevanje;rast utrujenostne razpoke;aluminijeve zlitine;zaostale napetosti;lomna žilavost;
Type (COBISS): Article
Embargo end date (OpenAIRE): 2018-06-01
Pages: str. 444-455
Issue: ǂVol. ǂ87
Chronology: Jun. 2016
DOI: 10.1016/j.ijfatigue.2016.02.027
ID: 12950782