The objective of this study is to investigate the crashworthiness performances of graded lattice structure filled tubes (GLSFTs) under multiple impact loadings. Different graded body-centered cubic aluminum lattice structures are taken into account in the hybrid tube designs by considering different draft angles and base diameters, and the crashworthiness of those structures are examined by using the validated nonlinear finite element method. The crashworthiness performances of the GLSFTs are also compared with the uniform lattice structure filled tubes (ULSFTs) with the same weights to show the efficiency of GLSFTs by considering several crashworthiness indicators (e.g., initial crush force (ICF), peak crush force (PCF), mean crush force (MCF) and specific energy absorption (SEA)). The results revealed that the graded lattice structure designs enable to obtain variable stiffness throughout the length of hybrid tubes and make possible more folds to be formed without global bending, thus provide significantly better energy absorption performance than their uniform counterparts, especially under oblique loadings. Particularly, the results showed that the GLSFTs can have up to 2 times lower ICF and 3.3 times higher SEA values than that of ULSFTs. The results also revealed that the GLSFTs can absorb up to 146% higher impact energy than the sum of energy absorption of their individual components, and a significant improvement in energy absorption performance of GLSFT can be obtained with appropriate selection of design parameters. Hence, GLSFTs can be recommended as passive protection elements in a broad range of energy absorption applications.

这项研究的目的是研究在多次冲击载荷下渐变网格填充管（GLSFT）的耐撞性能。在混合管设计中，通过考虑不同的吃水深度和底径，考虑了不同的梯度体心立方铝格结构，并使用经过验证的非线性有限元方法研究了这些结构的耐撞性。通过考虑几个耐撞性指标（例如，初始压溃力（ICF），峰值压溃力（PCF）），还将GLSFT的耐撞性能与相同重量的均匀网格结构填充管（ULSFT）进行比较，以显示GLSFT的效率。 ，平均挤压力（MCF）和比能量吸收（SEA））。结果表明，渐变的晶格结构设计能够在混合管的整个长度上获得可变的刚度，并且可以在不整体弯曲的情况下形成更多的折痕，因此与均匀的同类物相比，尤其是在倾斜载荷下，其吸能性能明显更好。特别是，结果表明，与ULSFT相比，GLSFT的ICF值低2倍，SEA值高3.3倍。调查结果还显示，该GLSFTs可以吸收到更高的146％碰撞能量比它们单个组件的能量吸收的总和，并在GLSFT的能量吸收性能显著的改善可与设计参数的适当选择来获得。因此，