Investigation of the sensitivity of the fatigue resistance to defect position in aluminium alloys obtained by Selective laser melting using artificial defects. (May 2020)

• Record Type: Journal Article
• Authors: Bonneric, Matthieu; Brugger, Charles; Saintier, Nicolas
• Is Part Of: International journal of fatigue. Volume 134(2020)
• Publication Date: 2020-05
• Subjects: Additive manufacturing -- Aluminium alloys -- Defects -- Fatigue; Materials -- Fatigue -- Periodicals; Materials -- Fatigue; Periodicals; 620.1122
• DOI: 10.1016/j.ijfatigue.2020.105505
• Languages: English
• ISSNs: 0142-1123

Abstract

Highlights: Artificial defects can be generated by introducing small holed in the CAD files. Defect geometry cannot be precisely controlled but is reproducible. The fatigue resistance is greatly sensitive to defect size and position. An efficient tomography to FEA methodology was developed. Numerical analysis allows to differentiate internal and subsurface defects. Abstract: This study focuses on the influence of defects on the fatigue behavior of AlSi7Mg0.6 alloy produced by Selective laser melting. Artificial defects were generated in fatigue specimens by introducing holes in the CAD files prior manufacturing. The introduction of such defects, whose sizes and positions are controlled, aims to provide a proper assessment of defect sensitivity, in particular regarding the influence of defect position. Fatigue tests were performed, and finite-element calculations accounting for real defect geometries were conducted. The criticalities of the simulated defects were then evaluated using a non-local Crossland criterion, and discussed with regard to the experimental results.