Abstract
The laser powder bed fusion AM process has been used to manufacture beams with unique internal geometries that are capable of increasing inherent damping in a part. The concept of the internal design is to have densely packed, unfused powder pockets that dissipate energy via particle interaction. Four Inconel (IN) 718 beams have been tested and all demonstrated the capability to suppress vibration 10X more effectively than a fully fused beam. The mechanism presumed to dissipate energy and thus suppress vibration is the sliding of unfused particles. This mechanism has been associated with a crack opening under Mode II fracture. Based on this assumption, a proportional expression has been developed as a criterion for optimizing unfused powder locations for vibration suppression effectiveness and was validated with 3.175 mm thick beams. This study investigates five uniquely designed IN-718 beams created via the optimizing criterion to assess accuracy of the expression. The intent of this study is to investigate the predictability of the unfused pocket optimization criterion. The results of this study will lead to a more robust design criterion for more complex 3D structures with improved damping capability.
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Acknowledgements
The authors would like to thank the Turbine Engine Fatigue Facility (TEFF) of the United States Air Force Research Laboratory (AFRL) and Universal Technology Corporation (UTC) for funding, support, and collaboration. Specifically, the authors would like to acknowledge UTC contractor Philip Johnson, Angela Still, Thaddeus Crowe, Ross Cefalu, and Christopher Howard for contributing to laboratory testing in the TEFF.
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Scott-Emuakpor, O. et al. (2019). Forced-Response Verification of the Inherent Damping in Additive Manufactured Specimens. In: Kramer, S., Jordan, J., Jin, H., Carroll, J., Beese, A. (eds) Mechanics of Additive and Advanced Manufacturing, Volume 8. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-95083-9_15
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DOI: https://doi.org/10.1007/978-3-319-95083-9_15
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