Investigation Into the Fatigue Life and Behavior of WAAM AM70 Steel
E. Arnarsson (TU Delft - Civil Engineering & Geosciences)
T. Tankova – Mentor (TU Delft - Civil Engineering & Geosciences)
H. El Bamby – Mentor (TU Delft - Civil Engineering & Geosciences)
V. Popovich – Graduation committee member
M.J.M.M. Steenbergen – Graduation committee member
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Wire and Arc Additive Manufacturing (WAAM) enables large-scale steel fabrication but often produces rough surfaces that are detrimental under cyclic loading. This thesis investigates how surface finish affects the fatigue performance of WAAM AM70, a high-strength steel comparable to S690, through strain-controlled low-cycle fatigue (LCF) and stress-controlled high-cycle fatigue (HCF) tests. As-built and machined specimens were compared, revealing surface finish as the dominant fatigue driver. Machining increased fatigue strength by factors of 3–9 and reduced scatter. The study provides EN 1990:2023-compliant design curves and mechanistic insight, showing that machined WAAM AM70 achieves fatigue performance approaching conventional S690.
Files
help_outline
File under embargo until 31-12-2026