In-plane dynamic performances of a tristar cellular structure under the lack of unit cell

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (10) : 115-123.

ZHAO Ying，WANG Kaifeng，SHI Jinyu，SANG Ye，LI Yunwu，CHEN Yu，YIN Jusan

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Abstract

Due to the reasons of manufacturing precision and production technology, the phenomenon of lacking unit cell always comes up in cellular structure inside, which can affect overall performances of cellular structure. This paper puts forward a tristar cellular structure with the characteristic of negative Poisson’s ratio (NPR). Firstly, the reliability of finite element model is verified by quasi-static compression test. Then, the joint-simulation analysis is carried out with the adoption of Hyperworks and LS-DYNA software. Eventually, deformation modes, stress-strain curves, energy absorption curves and platform stress curves of this cellular structure are obtained under the conditions of various impact velocities and different numbers of lacking unit cells. The results indicate that as the impact velocity is within the range from 20m/s to 80 m/s, the NPR characteristics turn to be less obvious with the increase of the number of lacking unit cells, energy absorption performances become weakened and the platform stress significantly decreases. The higher impact velocity is, higher energy absorption and platform stress can be acquired under the same number of lacking unit cells. This study can provide data support for its further application on energy absorber.

Key words

tristar cellular structure；lack of unit cell / negative Poisson’s ratio / finite element simulation / in-plane dynamic performance

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ZHAO Ying，WANG Kaifeng，SHI Jinyu，SANG Ye，LI Yunwu，CHEN Yu，YIN Jusan. In-plane dynamic performances of a tristar cellular structure under the lack of unit cell[J]. Journal of Vibration and Shock, 2022, 41(10): 115-123

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