In-plane energy absorption characteristics of a modified re-entrant auxetic structure fabricated via 3D printing
In-plane energy absorption characteristics of a modified re-entrant auxetic structure fabricated via 3D printing
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DOI：
10.1016/j.compositesb.2021.109437
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发表时间：
2021-11-02
影响因子：
13.1
通讯作者：
Kumar, S.
中科院分区：
文献类型：
--
作者：
Choudhry, Niranjan Kumar;Panda, Biranchi;Kumar, S.
Here, we present the in-plane energy absorption characteristics of modified re-entrant auxetic honeycombs realized via fused filament fabrication in conjunction with parametric analysis and geometry optimization. The influence and interaction effects of the geometrical parameters such as strut-length ratio and joint-angles on the stiffness, strength and energy absorption characteristics of modified re-entrant auxetic honeycombs were evaluated. Subsequently, Finite Element results obtained using ABAQUS/Explicit were corroborated with measured data. Deformation mode, stress-strain response and energy absorption behavior of an optimal re-entrant auxetic honeycomb were studied and compared with conventional re-entrant auxetic structure. Modified auxetic structure reveals an 36% improvement in the specific energy absorption capacity. Our analysis further indicates that due to the introduction of more nodes with low rotational stiffness, the failure strain of the modified reentrant structure has increased resulting in improved energy absorption capacity.
