We studied the crashworthiness performance of thin-walled ultralight braided lattice composites (UBLCs) under quasi-static compressive loading experimentally and numerically. The lattice structures were initially preformed on mandrels with various cross-sectional geometries, including circular, octagonal, hexagonal, and rectangular. The effects of cross-section type and perimeter were also investigated. Our results showed that the square-shaped sample exhibited the highest specific absorbed energy (SAE) and absorbed energy per length. We also investigated the effect of the number of lattice layers. The concentric multi-layer samples absorbed more energy than single-layer samples due to interactions between the embedded layers. Furthermore, the crushing force efficiency (CFE) was improved by the use of multi-layer samples. Finite element (FE) modeling was used to predict and analyze the energy absorption behavior of UBLC samples. Both structure buckling and material failure were included in the simulations. The results of the FE simulation were in good agreement with our experimental results. The SAEs of single-layer and multi-layer UBLCs are significantly higher than those of expanded metal tubes. Considering SAE and CFE simultaneously, we can conclude that the energy absorption behavior of UBLC structures is more promising than that of similar tubular lattice structures.

我们通过数值模拟研究了准静态压缩载荷作用下薄壁超轻型编织晶格复合材料（UBLC）的耐撞性能。晶格结构最初是在具有各种横截面几何形状（包括圆形，八边形，六边形和矩形）的心轴上预成型的。还研究了横截面类型和周长的影响。我们的结果表明，方形样品显示出最高的比吸收能（SAE）和每长度的吸收能。我们还研究了晶格层数的影响。由于嵌入层之间的相互作用，同心的多层样品比单层样品吸收更多的能量。此外，通过使用多层样品，提高了破碎力效率（CFE）。有限元（FE）建模用于预测和分析UBLC样品的能量吸收行为。模拟中包括结构屈曲和材料破坏。有限元模拟的结果与我们的实验结果非常吻合。单层和多层UBLC的SAE显着高于金属网管的SAE。同时考虑SAE和CFE，我们可以得出结论，UBLC结构的能量吸收行为比类似的管状晶格结构更有希望。单层和多层UBLC的SAE显着高于金属网管的SAE。同时考虑SAE和CFE，我们可以得出结论，UBLC结构的能量吸收行为比类似的管状晶格结构更有希望。单层和多层UBLC的SAE显着高于金属网管的SAE。同时考虑SAE和CFE，我们可以得出结论，UBLC结构的能量吸收行为比类似的管状晶格结构更有希望。