| Abstract Scope |
Additive manufacturing (AM) has recently gained much interest due to the many advantages it offers, as compared to the traditional subtractive manufacturing methods. Some distinguishing features of AM metals include surface roughness, defects, residual stresses, and anisotropy of the properties. Most components made of AM processes are subjected to cyclic loads, therefore, fatigue performance is an important consideration, particularly in safety critical applications. This presentation provides an overview of the aforementioned issues using recent data generated using AM Ti-6Al-4V and 17-4 PH stainless steel. Specimens were made by L-PBF and subjected to axial, torsion, and combined loadings. A variety of conditions including surface roughness, thermo-mechanical treatment, damage mechanisms and crack paths, cyclic deformation, crack nucleation and growth, and stress concentration effects are considered. In addition, application of the specimen data to component level fatigue performance is also considered by using an additively manufactured tension link as an illustrative example. |