Temperature influence of metamaterials based on flexible TPU 95A plastic on resistance to penetration by a rigid striker

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Abstract

The mechanical properties of metamaterials with a cellular chiral internal structure were experimentally studied during normal penetration by a rigid spherical striker. The metamaterial samples were 3D printed from TPU 95A plastic (thermoplastic polyurethane). They had auxetic and non-auxetic chiral structures of cells in the form of concave and convex hexagons, respectively. The results of the experiments on sample penetration, conducted for two temperature and two speed modes, are presented. The relative loss of kinetic energy of the striker during penetration of auxetic samples was significantly higher than that of non-auxetic ones. It was found that for the studied types of flexible metamaterials, the resistance to striker penetration increases with increasing temperature in the considered temperature range. The dependence of the striker deviation on exit from the flexible sample on the type of chirality of the structure being penetrated was established.

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About the authors

S. Y. Ivanova

Ishlinsky Institute for Problems in Mechanics RAS

Author for correspondence.
Email: lisovenk@ipmnet.ru
Russian Federation, Moscow

K. Y. Osipenko

Ishlinsky Institute for Problems in Mechanics RAS

Email: lisovenk@ipmnet.ru
Russian Federation, Moscow

N. V. Banichuk

Ishlinsky Institute for Problems in Mechanics RAS

Email: lisovenk@ipmnet.ru
Russian Federation, Moscow

D. S. Lisovenko

Ishlinsky Institute for Problems in Mechanics RAS

Email: lisovenk@ipmnet.ru
Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Dependence of the relative loss of kinetic energy of the impactor d (%) on the mass m [g] of the pierced chiral auxetic (a) and nonauxetic (b) samples: at flight speeds of 150 and 190 m/s.

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3. Fig. 2. Dependence of the relative loss of kinetic energy of the impactor d (%) on the mass m [g] of the pierced chiral auxetic and nonauxetic samples: at flight speeds of 150 m/s (a) and 190 m/s (b).

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4. Fig. 3. Dependence of the relative kinetic energy loss of the impactor d (%) on the mass m [g] of the punched chiral auxetic and non-auxetic samples from TPU 95A and PLA plastics at flight speeds of 150 m/s and a temperature of 16 °C.

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5. Fig. 4. Deviation of the direction of movement of the impactor at the exit of the samples from the approach: chiral (“/”) auxetic sample (94/90, Table. 2), downward deviation of ∼3° (a); chiral (“\”) nonauxetic sample (125/111, Table. 3), upward deviation of ∼3° (b).

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