Surface roughness effects on the fatigue strength of additively manufactured Ti-6Al-4V
By Jonathan W. Pegues, M. Roach, R. Scott Williamson, Nima Shamsaei. International Journal of Fatigue, 2018
323 citations recorded by the source corpus.
Abstract Additive manufacturing has become an increasingly popular advanced manufacturing technique, however, many questions concerning the reliability of parts fabricated by methods such as laser powder bed fusion must be addressed. In this research, the effect of surface roughness and size is investigated by designing various additively manufactured Ti-6Al-4V specimen geometries. These as-built specimens were designed to specifically determine the effect of surface area and part diameter on the fatigue behavior of specimens fabricated diagonally from the substrate. Results indicate that the fatigue behavior is more sensitive to part diameter than surface area. Parts with diameters of 4.90 mm or less showed higher surface roughness on the down-skin surface. This variation diminished, however, for specimens with diameters larger than 4.90 mm. Additionally, as part diameter decreased, the difference between the load-bearing and nominal stress amplitudes, caused by surface roughness, increased, resulting in significant scatter in the high cycle fatigue data.
Subfields: Automotive Engineering, Materials Chemistry, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/36dc855af32647a15dcc082fcfd989b3a16acfaa
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Citations in the corpus
- Fatigue of additive manufactured Ti-6Al-4V, Part I: The effects of powder feedstock, manufacturing, and post-process conditions on the resulting microstructure and defects (2020, background): “The roughness is higher for the downward-facing surfaces (down-skin) compared to the upward-facing surfaces (up-skin) [60,67].”
- High cycle fatigue behavior and life prediction for additively manufactured 17-4 PH stainless steel: Effect of sub-surface porosity and surface roughness (2020, unknown): “[19] investigated the surface roughness effect on the fatigue performance of LB-PBF Ti-6Al-4V fabricated at 45° (i.”