About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Applications
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Presentation Title |
Characterizing and Designing for Geometry-dependent Material Properties in Direct Metal Laser Sintering |
Author(s) |
Conner Sharpe, Andrew Allan, Carolyn Seepersad, Bradley Jared |
On-Site Speaker (Planned) |
Carolyn Seepersad |
Abstract Scope |
Layer-based AM techniques such as direct metal laser sintering (DMLS) frequently result in anisotropic material properties that depend on geometric design factors such as feature orientation relative to the build platform. These issues can be exacerbated in lattice structures, where the use of small struts can cause degradation in part quality and significant deviations from the expected mechanical properties of the bulk constituent material. These issues are commonly ignored during the design process due to insufficient data or implementation difficulties. This work tests strut tensile specimens that are built at a variety of diameters and overhang angles. The parts are analyzed with digital image correlation (DIC) to investigate the effect of these factors on effective stiffness and strength. The stiffness results are then incorporated into a process-aware design optimization framework that illustrates the potential for significant improvements in the performance of additively manufactured lattice structures. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |