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Effect of Topology on Transient Dynamic and Shock Response of Polymeric Lattice Structures

Journal Article · · Journal of Dynamic Behavior of Materials
 [1];  [2]
  1. California Institute of Technology (CalTech), Pasadena, CA (United States); Institute for Shock Physics, Washington State University
  2. California Institute of Technology (CalTech), Pasadena, CA (United States); Jio Institute, Maharashtra (India)
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%. Here, 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.
Research Organization:
Washington State University, Pullman, WA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003957
OSTI ID:
2006604
Journal Information:
Journal of Dynamic Behavior of Materials, Journal Name: Journal of Dynamic Behavior of Materials Journal Issue: 1 Vol. 9; ISSN 2199-7446
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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