About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Additive Manufacturing: Design, Materials, Manufacturing, Challenges and Applications
|
| Presentation Title |
Impact of Defects and Geometric Deviations on the Mechanical Performance of Laser Powder Bed Fusion Fabricated Plate-Lattice Structures |
| Author(s) |
Joseph Berthel, Jack Beuth, Rahul Panat |
| On-Site Speaker (Planned) |
Joseph Berthel |
| Abstract Scope |
Laser powder bed fusion (LPBF) has enabled the fabrication of complex lattice structures with geometries designed to optimally distribute loads, leading to exceptional stiffness-to-weight ratios. However, defects inherent to the LPBF process cause as-fabricated lattice geometries to deviate from the design, compromising mechanical performance. Fabrication challenges are especially prevalent for thin-plate lattices, where feature sizes approach the resolution limits of LPBF. This presentation comprehensively evaluates the geometric deviations present in LPBF fabricated plate-lattice topologies to determine the influence of processing parameters and geometry on fabrication fidelity. Micro-computer tomography is used to reconstruct 3D models of as-fabricated lattice unit cells, which are compared to ideal models to quantify defect severity. Compression finite element simulations are performed on as-fabricated and ideal unit cell models to determine the detrimental effects of defects on strain energy distribution and resultant lattice stiffness and density. |