Abstract
The propagation of shocks through additively-manufactured (AM) polymeric structures containing multiple length scales of engineered porosity is studied both experimentally and computationally. In this study, a single-stage light gas gun is used to impact cube-shaped specimens, 40 mm on a side, instrumented with photon Doppler velocimeter (PDV) light probes to capture free surface velocities and side-looking high-speed video to capture deformation history. A combined Eulerian-Lagrangian finite element (FE) model has been developed which reproduces the majority of the observed experimental trends, based on an independently-measured shock Hugoniot for the bulk AM polymer. After initial calibration, the FE model has been used to suggest candidate geometries for experimental investigation, based on the desired shock response. Geometries for structurally-efficient shock mitigation have been investigated. In a separate set of experiments, miniature (6 mm × 6 mm) square specimens have been impacted at the Dynamic Compression Sector at the Advanced Photon Source (APS), and imaged using x-ray Phase Contrast Imaging (PCI). This technique gives strong evidence for the propagation of discrete shocks within the engineered foam structures, in agreement with our models.
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Acknowledgements
This work was supported by Air Force Office of Scientific Research, 6.1 LRIR “Novel Material Microstructures for Shock Survivability (16RXCOR326)”, Dynamic Materials and Interactions Portfolio, Program Officers Dr. Jennifer L. Jordan, Dr. Martin J. Schmidt, AFOSR/RT. Experiments at the Dynamic Compression Sector were performed by Los Alamos National Laboratory at Argonne National Laboratory’s Advanced Photon Source (APS). The authors acknowledge support from the Laboratory Directed Research and Development (LDRD) program at Los Alamos National Laboratory (Project No. 20160103DR) and DOE/NNSA Campaign 2. LANL is operated by Los Alamos National Security, LLC, for the U.S. Department of Energy (DOE) under Contract No. DEAC52- 06NA25396. Use of the Advanced Photon Source, an Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357. Cleared for Public Release, Distribution Unlimited 88ABW-2018-0733.
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Spowart, J.E., Lacina, D., Neel, C.(., Frank, G., Abbott, A., Branch, B. (2019). Shock Propagation and Deformation of Additively-Manufactured Polymer Foams with Engineered Porosity. 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_10
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