In-plane compression tunable stiffness characteristics of star-triangular honeycomb with negative Poisson’s ratio

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (4) : 105-114.

WEI Lulu1,2，XU Shiwei1，ZHU Guohua2，ZHAO Xuan2

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Abstract

Quasi-static in-plane compression tests were used to reveal the tunable stiffness characteristics of star-triangular honeycomb (STH). The tunable mechanism of compression stiffness for STH with non-homogeneous cell-wall thickness was investigated via finite element simulation, and the influences of different cell-wall thickness ratios (("t" _"1" "=" "t" _"3" ))⁄"t" _"2" and cell-wall angles on the in-plane compression stiffness were analyzed. The results show that the stress-strain curve of STH shows two linear elastic stages under in-plane compression loading, and the strengthening stiffness is significantly higher than the initial stiffness. Appropriately increasing the thickness of re-entrant and vertical cell-walls can significantly improve the initial stiffness and strengthening stiffness of STH. When (("t" _"1" "=" "t" _"3" ))⁄"t" _"2" >"1.575" , the initial stiffness continues to increase while the strengthening stiffness gradually decreases, and finally the strengthening stiffness phase disappears. When "α"≤"40°" , increasing the cell-wall angle can improve the initial stiffness and strengthening stiffness of STH. On the contrary, the initial stiffness and strain corresponding to strengthening stiffness gradually increased with the increase of cell-wall angle, while strengthening stiffness gradually decreased and tended to disappear. This study is expected to provide a novel path for design of auxetic honeycombs with tunable stiffness．

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star-triangular honeycomb (STH) / negative Poisson’s ratio / tunable stiffness / non-homogeneous cell-wall thickness / quasi-static compression

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WEI Lulu1,2，XU Shiwei1，ZHU Guohua2，ZHAO Xuan2. In-plane compression tunable stiffness characteristics of star-triangular honeycomb with negative Poisson’s ratio[J]. Journal of Vibration and Shock, 2024, 43(4): 105-114

References

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