INVESTIGATION OF DEFORMATION AND FAILURE PROCESSES OF A NATURE-INSPIRED CELLULAR STRUCTURE (THE SCHWARZ PRIMITIVE) UNDER HIGH-STRAIN-RATE LOADING
A.Yu. Kolyvanov1,2, S.V. Balabanov2, I.A. Sobolev1, M.Yu. Arsentyev3, M.M. Sychev4,5, S.V. Dyachenko2,4
1D.F. Ustinov Baltic State Technical University “Voenmech”, Saint Petersburg, Russia
2Kurchatov Institute, Branch of the Konstantinov Saint Petersburg Nuclear Physics Institute, Grebenshchikov Institute of Silicate Chemistry, Saint Petersburg, Russia
3Information Technologies, Mechanics and Optics University, Saint Petersburg, Russia
4Saint Petersburg State Institute of Technology (Technical University), Saint Petersburg, Russia
5Kurchatov Institute, Prometey Central Scientific Research Institute of Structural Materials, Saint Petersburg, Russia
Keywords: cellular material, triply periodic minimal surface, additive manufacturing, 3D printing, high-strain-rate loading, impact, strength, deformation, Kolsky method
Abstract
Results of an experimental study on the deformation and failure of nature-inspired cellular structures under compression at high strain rates are presented. Tests are conducted on specimens with the Schwarz primitive geometry, modeled with different volume fractions (ϕ), as well as on solid specimens. The specimens are fabricated from polylactide polymer using 3D printing. An increase in compressive strength and elastic modulus is observed with increasing strain rate at constant ϕ. Specific energy absorption values are determined for the cellular structures studied. The Gibson-Ashby relationship for cellular structures is confirmed to hold under high-strain-rate loading.
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