Abstract
Architected cellular materials, such as lattice structures, offer potential for tunable mechanical properties for dynamic applications of energy absorption and impact mitigation. In this work, the static and dynamic behavior of polymeric lattice structures was investigated through experiments on octet-truss, Kelvin, and cubic topologies with relative densities around 8%. Dynamic testing was conducted via direct impact experiments (25–70 m/s) with high-speed imaging coupled with digital image correlation and a polycarbonate Hopkinson pressure bar. Mechanical properties such as elastic wave speed, deformation modes, failure properties, particle velocities, and stress histories were extracted from experimental results. At low impact velocities, a transient dynamic response was observed which was composed of a compaction front initiating at the impact surface and additional deformation bands whose characteristics matched low strain-rate behavior. For higher impact velocities, shock analysis was carried out using compaction wave velocity and Eulerian Rankine–Hugoniot jump conditions with parameters determined from full-field measurements.
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Acknowledgements
The authors gratefully acknowledge the support of DOE/NNSA Award No. DE-NA0003957. The authors thank Prof. K.T. Faber (Caltech) for access to the Autodesk Ember 3D printer. The support of the Army Research Laboratory under the Cooperative Agreement Number W911NF-12-2-0022 for the acquisition of the high-speed camera used in this investigation is acknowledged. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
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Weeks, J.S., Ravichandran, G. Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures. J. dynamic behavior mater. 9, 44–64 (2023). https://doi.org/10.1007/s40870-022-00359-2
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DOI: https://doi.org/10.1007/s40870-022-00359-2