About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Ultrasonic Characterization of Sound Speeds in 3D-printed Polymers |
Author(s) |
Akash S. Nivarthi, Michael R. Haberman, Christina J. Naify |
On-Site Speaker (Planned) |
Akash S. Nivarthi |
Abstract Scope |
Ultrasonic testing can be used to nondestructively measure longitudinal and shear sound speeds to characterize additively manufactured materials. Fused deposition modeling (FDM), a popular additive method, extrudes heated filament layer-by-layer onto a print bed to produce 3D models. Despite widespread use of FDM to produce complex geometries, the acoustical properties of the as-built materials are under-characterized. Previous efforts have measured longitudinal sound speed for various FDM-built materials with a single sample thickness. This work reports longitudinal and shear wave measurements on polylactic acid (PLA) samples of varying thickness using pulse-echo and through-transmission methods. Moduli are determined from group and phase speed estimation using the measured time-of-flight. Measurements on a range of sample thicknesses improves statistical significance of the effective modulus estimates when compared to previous work. Further, samples were printed in two orientations to examine anisotropy in the effective stiffness. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |