| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Additive Manufacturing: Mechanical Behavior of Lattice Structures Produced via AM
|
| Presentation Title |
Predicting Interfacial Cracking between Solid and Lattice Support Structure during Laser Powder Bed Fusion Processing |
| Author(s) |
Hai Tran, Xuan Liang, Albert To |
| On-Site Speaker (Planned) |
Albert To |
| Abstract Scope |
For laser powder bed fusion (L-PBF) additive manufactured (AM) metals, residual stress-induced cracking often occurs at the interface between the solid and lattice support structure, and hence it is important to characterize the as-built critical J-integral of the interface to prevent cracking to occur. For this reason, an effective method that combines printing experiments and residual stress simulation is proposed to determine the as-built critical J-integral of the interface. First, a number of rectangular block specimens with lattice supports of identical height overlaid by solids of different heights are built by L-PBF in Inconel 718 in order to determine the critical height that the block would crack. Next, the experimentally-validated modified inherent strain method is utilized to simulate residual stress and compute the critical J-integral at where the interfacial cracking occurs. The proposed method is subsequently validated using the obtained critical J-integral to predict cracking in different geometries. |