High strain-rate compression behavior of polymeric rod and plate Kelvin lattice structures

Weeks, John S.; Ravichandran, Guruswami

doi:10.1016/j.mechmat.2022.104216

High strain-rate compression behavior of polymeric rod and plate Kelvin lattice structures

Journal Article · Tue Jan 18 23:00:00 EST 2022 · Mechanics of Materials

DOI:https://doi.org/10.1016/j.mechmat.2022.104216· OSTI ID:1907893

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California Institute of Technology (CalTech), Pasadena, CA (United States); Institute for Shock Physics, Washington State University
California Institute of Technology (CalTech), Pasadena, CA (United States)

The compressive high strain-rate behavior of polymeric Kelvin lattice structures with rod-based or plate-based unit cells was investigated through experimental techniques and finite element simulations. Polymeric lattice structures with 5x5x5 unit cell geometries were manufactured on the millimeter scale using vat polymerization additive manufacturing and tested at low (0.001/s) and high (1000/s) strain-rates. High strain-rate experiments were performed and validated for a viscoelastic split-Hopkinson (Kolsky) pressure bar system (SHPB) coupled with high-speed imaging and digital image correlation (DIC). Experimental results at both low and high strain-rates show the formation of a localized deformation band which was more prevalent in low relative density specimens and low strain-rate experiments. Strain-rate effects of lattice specimens strongly correlate with effects of the base polymer material; both bulk polymer and lattice specimen demonstrated strain-rate hardening, strain-rate stiffening, and decreased fracture strain under dynamic loading. Results show mechanical failure properties and energy absorption depended strongly on the relative density of the lattice specimen and exhibited distinct scaling between relative density and geometry type (rod, plate) and loading rate. High relative density plate-lattices demonstrated inferior mechanical properties to rod-lattices; however, there exists a critical relative density for a given mechanical property (17%- 28%) below which plate-lattices outperform rod-lattices of similar mass. As a result, high strain-rate explicit finite element simulations were performed and showed good agreement with the mechanical failure trends and deformation modes observed in the experiments.

View Accepted Manuscript (DOE)

Research Organization:: Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: NA0003957

OSTI ID:: 1907893

Alternate ID(s):: OSTI ID: 1841460

Journal Information:: Mechanics of Materials, Journal Name: Mechanics of Materials Vol. 166; ISSN 0167-6636

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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