| Issue |
MATEC Web Conf.
Volume 188, 2018
5th International Conference of Engineering Against Failure (ICEAF-V 2018)
|
|
|---|---|---|
| Article Number | 03015 | |
| Number of page(s) | 9 | |
| Section | Metallic Materials II: Damage Accumulation, Structural Integrity, Advanced Manufacturing Techniques | |
| DOI | https://doi.org/10.1051/matecconf/201818803015 | |
| Published online | 07 August 2018 | |
High cycle fatigue life estimation of AlSi10Mg processed by laser powder bed fusion
1
Norwegian University of Science and Technology,
7031
Trondheim,
Norway
2
SINTEF Industry,
0373
Oslo,
Norway
* Corresponding author: even.w.hovig@ntnu.no
Fatigue life is known to be dependent on the surface properties of the material. Surface roughness provokes local stress concentration and cause crack initiation even at minute cyclic loads. In laser powder bed fusion, the as-built surfaces show variable roughness depending on the orientation of the specimens with respect to the build plate. In order to analyse the effect of build angle on surface properties, flat tensile specimens were produced from an AlSi10Mg alloy in a Concept Laser M2 Cusing machine. Seven specimens were arranged from flat to perpendicular with respect to the build plate at 15° intervals. The as-built surface topography of each specimen was characterised by white light interferometry. Two methods for calculating the stress concentration factor for high cycle fatigue simulation were developed. The presence of subsurface porosity was a crucial factor in expanding the stress concentration as demonstrated by finite element analysis.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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