| Abstract Scope |
Before additively manufactured (AM) parts can be trusted in load-bearing applications, their fatigue performance should be well-characterized. However, due to variations in geometries, and therefore, thermal histories experienced, the mechanical properties of witness coupons may not be representative of the critical location of AM parts. Differences in thermal history can influence the microstructure and porosity level in the material, thus affecting the specimen property-to-part performance relationships. This presentation provides an overview on the challenges in generating fatigue data and design allowables for AM materials. Results show that the process parameters can be adjusted by understanding the effect of geometry on the thermal history to fabricate specimens with the same microstructure and defect level as the material at the critical location of the part in service. It will be argued that property-performance relationships, i.e. specimen property-to-part performance, can be further established by fully understanding the process-structure relationships for AM materials/parts. |