|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Additive Manufacturing Fatigue and Fracture V: Processing-Structure-Property Investigations and Application to Qualification
||Variation and Impact of Surface Roughness on Fatigue in Laser Powder Bed Fusion
||Rachel Evans, Joy Gockel, Luke Sheridan
|On-Site Speaker (Planned)
Although any type of defect can weaken the performance of an additively manufactured part, rough surfaces with deep notches have been shown in prior studies to be a leading cause in decreasing the fatigue life. However, there is a lack of understanding of the surface roughness, the variability, and the appropriate metrics to sufficiently represent the impact of the surface on the mechanical performance. This work investigates the surface roughness of specimens fabricated with laser powder bed fusion through the calculation and comparison of surface measurement metrics. After these metrics are calculated, the variation within each sample and across different surfaces is determined. The calculated metrics and variations are related to the expected impact that the surface will have on the fatigue performance through fracture mechanics methods. Results from this research will provide guidance towards surface roughness metric and sampling specifications to ensure quality parts with consistent mechanical performance.