About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Physical Modeling
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Presentation Title |
Modified Gibson-Ashby Model for Stiffness Prediction of Defective Lattices |
Author(s) |
Panwei Jiang, Saurabh Basu |
On-Site Speaker (Planned) |
Panwei Jiang |
Abstract Scope |
Additively manufactured lattice structures often exhibit porosity and surface roughness defects in the as-received state. These defects degrade the stiffness of the parent structure whose quantification is important for their systematic design and post-processing. Here, we argue that this is not possible using traditional macro-scale models such as the Gibson-Ashby (GA) law which only takes the relative density of the lattice into account. This is because these defects manifest fluctuations in mechanical behavior at a smaller scale, which is not encapsulated by a macro-scale model. This concept is demonstrated by simulation and analysis of the full field elastic response of 2.5D body centered cubic lattices with artificially implanted porosity and surface roughness. The complex degradation caused by defects is captured in multiplicative alterations to the GA law. A method based on principal component analysis of strain fields in the struts of the lattice structure is calibrated to delineate these effects. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |