Mechanical behavior of three-layer structures made of aluminum alloy with layers of auxetic metamaterial under dynamic impacts in the temperature range of 153–473 K

This paper presents the results of a numerical study of deformation, fracture, and energy absorption by three-layer structures with an auxetic metamaterial interlayer under dynamic loads in the temperature range of 153-473 K. The response of layered systems made of aluminum alloy 1520 to the shock-pulse impacts and cyclic loading at initial temperatures within the specified range is investigated. The 3D layered structures with the auxetic metamaterial interlayer that can effectively absorb and dissipate the energy of pulse impacts are considered. It is shown that a decrease in the dissipative properties of the three-layer structures with the auxetic metamaterial layer made of aluminum alloy 1520 under dynamic loading is a result of the irreversible compaction of the metamaterial layer and concurrent damages and fractures of the metamaterial elements. A sharp decrease in the energy dissipation factor occurs when the compression strain of the auxetic metamaterial layer exceeds 69% regardless of the initial temperature. The effect of increasing temperature due to energy dissipation on the geometric, physical, mechanical, and thermal characteristics of the metamaterial layer is inconsiderable. These characteristics are significantly affected by initial temperature variations in the range of 153-473 K.

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