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 |
An Ultrasonic Technique to Determine the Onset of Select Laser Flash Sintering |
Author(s) |
Christina L. Nissen, Arturo Hernandez-Barreto, Michael R. Haberman, Joseph J Beaman, Desiderio Kovar |
On-Site Speaker (Planned) |
Christina L. Nissen |
Abstract Scope |
Detecting the onset of sintering non-destructively is challenging because visible changes to the powder particle morphology may be too subtle to observe directly. One material property that is highly sensitive to even small changes in particle morphology is the Young’s modulus. Here we investigate the use of an ultrasonic laser system to measure the local Young’s modulus from the surface acoustic wave speed. Time-of-flight measurements are made on control samples that were partially sintered at different temperatures. These samples provide known reference values that relate the relative densities to the Young’s modulus. We then test the methodology on model samples that have local regions of high density that are embedded in regions of lower density to demonstrate the utility of this technique for detecting the onset of selective laser flash sintering. We expect that this technique may also be applicable to other powder-based additive manufacturing processes. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |