Abstract Lightweight cellular materials and structures are widely used in load-bearing and energy absorption applications, because of favorable mechanical properties such as high compressibility and low relative density. Recent progress in additive manufacturing techniques has enabled specific architectural geometries of unit cells in cellular structures to be tailored for particular needs. Numerous metallic and polymeric cellular lattices comprising different unit cell topologies have been manufactured and examined in terms of their energy absorption performance. In this study, two designs of hybrid three-dimensional cubic lattices which combine the advantages of an octet and a bending-dominated structure were established, and fabricated via the Fused Deposition Modeling technique. To validate the energy absorption capability of these new hybrid lattices, quasi-static uniaxial compression tests were conducted on samples made from Polylactic Acid. Numerical simulations were also performed to facilitate analysis of the deformation modes of the specimens tested in experiments. Tensile tests on solid dog-bone samples printed at various angles with respect to the build plate reveal fabrication-angle-dependent anisotropy. Consequently, material properties that depend on cell strut inclination were incorporated into the simulations. Compared with a conventional octet that possesses a high stiffness but a fluctuating post-yield response, the experimental results show that the new designs are capable of producing a relatively stable post-yield stress plateau without sacrificing stiffness and strength significantly. The present study indicates the potential for further enhancement of the energy absorption performance of lattice structures by tuning their topological architectures appropriately.

中文翻译：

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用于能量吸收的增材制造聚合物混合晶格结构的表征和建模

摘要 轻质蜂窝材料和结构由于具有良好的机械性能，如高压缩性和低相对密度，被广泛用于承重和能量吸收应用。增材制造技术的最新进展使蜂窝结构中单元电池的特定建筑几何形状能够针对特定需求进行定制。已经制造了许多包含不同晶胞拓扑结构的金属和聚合物蜂窝晶格，并检查了它们的能量吸收性能。在这项研究中，建立了两种混合三维立方晶格的设计，它们结合了八位字节和弯曲主导结构的优点，并通过熔融沉积建模技术制造。为了验证这些新型混合晶格的能量吸收能力，对由聚乳酸制成的样品进行了准静态单轴压缩试验。还进行了数值模拟，以方便分析实验中测试的试样的变形模式。相对于构建板以不同角度打印的固体狗骨样品的拉伸测试揭示了制造角度相关的各向异性。因此，依赖于单元支柱倾斜度的材料特性被纳入模拟中。与具有高刚度但屈服后响应波动的传统八位字节相比，实验结果表明，新设计能够在不显着牺牲刚度和强度的情况下产生相对稳定的屈服后应力平台。