Valle Rodrigo, Pincheira Gonzalo, Tuninetti Víctor, Fernandez Eduardo, Uribe-Lam Esmeralda
Faculty of Engineering, University of Talca, Talca 3340000, Chile.
Department of Industrial Technologies, Faculty of Engineering, University of Talca, Talca 3340000, Chile.
Materials (Basel). 2022 Mar 1;15(5):1841. doi: 10.3390/ma15051841.
A three-dimensional auxetic structure based on a known planar configuration including a design parameter producing asymmetry is proposed in this study. The auxetic cell is designed by topology analysis using classical Timoshenko beam theory in order to obtain the required orthotropic elastic properties. Samples of the structure are fabricated using the ABSplus fused filament technique and subsequently tested under quasi-static compression to statistically determine the Poisson's ratio and Young's modulus. The experimental results show good agreement with the topological analysis and reveal that the proposed structure can adequately provide different elastic properties in its three orthogonal directions. In addition, three point bending tests were carried out to determine the mechanical behavior of this cellular structure. The results show that this auxetic cell influences the macrostructure to exhibit different stiffness behavior in three working directions.
本研究提出了一种基于已知平面构型的三维负泊松比结构，该构型包含一个产生不对称性的设计参数。通过使用经典的铁木辛柯梁理论进行拓扑分析来设计负泊松比单元，以获得所需的正交各向异性弹性性能。采用ABSplus熔丝技术制造该结构的样品，随后在准静态压缩下进行测试，以统计确定泊松比和杨氏模量。实验结果与拓扑分析结果吻合良好，表明所提出的结构能够在其三个正交方向上充分提供不同的弹性性能。此外，还进行了三点弯曲试验以确定这种多孔结构的力学行为。结果表明，这种负泊松比单元影响宏观结构，使其在三个工作方向上表现出不同的刚度行为。
