多层级蜂窝材料面内模量对孔壁弯曲的缺陷敏感性

Imperfection sensitivities of in-plane moduli of hierarchical lattice materials to cell edge waviness

为提升蜂窝材料的抗缺陷能力,在正六边形、Kagome和正三角形蜂窝材料的孔壁表面附着软材料层,制备了多层级蜂窝材料。然后针对孔壁弯曲缺陷类型,使用解析方法研究了蜂窝材料面内模量的缺陷敏感性和力学性能,并用数值模拟对理论值进行了验证。结果表明:通过选择合适的附着软材料层与几何参数,可使得多层级蜂窝材料比传统蜂窝材料对缺陷有更高的抵抗能力,表现出较低的缺陷敏感性。另外,在保持相对密度不变的前提下,多层级蜂窝材料的力学性能与传统蜂窝材料的相比也有较大提高。研究结论为设计制造具有抗缺陷能力的新型蜂窝材料提供了理论基础。

In order to improve the ability to resist defects of lattice materials, soft material layers were adhered to the surfaces of cell edges of regular hexagon, Kagome and regular triangle lattice materials, and hierarchical lattice materials were prepared. Then, for the edge waviness defect type, the imperfection sensitivities of the in-plane mod- uli and mechanical performances of lattice materials were investigated by analytic method, and the theoretical values were verified by numerical simulations. The results indicate that by choosing appropriate adhesive soft material layer and geometric parameters can make the resist ability of hierarchical lattice materials to defect higher than that of classic lattice materials, and show relative low imperfection sensitivities. Meanwhile, on condition of the relative density remains unchanged, the mechanical performances o{ hierarchical lattice materials have a great enhancement compared with that of classic lattice materials. The investigation conclusions provide theoretical basis for the design and manufacture of new lattice materials which have anti-defect abilities.