Abstract
In this study, the gradient honeycomb structure is combined with hybrid auxetic structures and their behavior is monitored. To the hybrid auxetic structure, two types of gradient honeycomb unit cells are attached. The first type is constant diagonal with varying cell size whereas the second type is constant cell size with varying diagonal. In both the varying cases (cell size & diagonal), two different decrements namely 2 mm & 3.5 mm respectively are made to the model and their effects are noticed. In addition to the variation within gradient honeycomb structures, the number of hybrid auxetic structures is also varied. Further, on all the models, a compression test with a load of 1000 N & an impact test is run where the impacting velocity is set at 25 m/s. The tests conducted are analyzed over two loading conditions. One in which the honeycomb side is subjected to load/impact and the latter being the auxetic side. This is done to identify the orientation producing better impact absorption characteristics than the rest of the designed models. It is observed that during impact test, the energy absorbed by the diagonal variant (2 mm) & cell size variant (2 mm) are 165 J and 100 J when the auxetic & honeycomb sides are impacted respectively. Also, to support the results obtained, a comparative study is made between the newly designed complaint structure & the existing honeycomb-bowtie auxetic hybrid structure.
Published Version
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