Lattice structures that possess exceptional energy absorption capabilities show promise across various fields. However, their tendency to exhibit relatively low stiffness due to rotation or bending during impacts poses a challenge. Shear thickening fluid with the unique property of shear thickening effect can be an ideal filler to overcome the limitation of lattice structure. In this paper, composites that combined STF with new lattice structures were fabricated to investigate their dynamic response using experimental and numerical means and found that incorporating STF into these lattice structures not only preserved the inherent mechanical characteristics of the lattice structures but also led to substantial improvements on mechanical performance. The lattice structures displayed a noteworthy boost in stiffness, increasing significantly from 11.02 to 85.56 times. Additionally, there was an improvement in energy absorption, ranging from 2.78 to 5.51 times. These findings indicate that STF holds more promise in enhancing a structure's stiffness compared to its energy absorption capacity. Moreover, strain rate, weight fraction of STF, and cell size of the lattice structure were considered to further investigate their impact on the dynamic behaviour of STF-filled lattice structures. Our findings indicate that the increase in stiffness and energy absorption of the lattice structure following STF filling is correlated with an increase in strain rate and weight fraction but decreases when the cell size of the lattice structure is increased. The critical strain rate of STF-filled lattice structure was predicted, around 104 s, which indicates the onset of the shear-thickening effect in STF. Furthermore, it was observed that composites with higher weight fractions of STF were more responsive to changes in strain rate. Additionally, structures with initially lower mechanical properties experienced the most significant improvements after being filled with STF. These optimal outcomes provide valuable insights for the design of STF-filled lattice structures in practical applications.

中文翻译：

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剪切增稠流体填充晶格结构的动态响应

具有卓越能量吸收能力的晶格结构在各个领域都展现出了广阔的前景。然而，它们在冲击过程中由于旋转或弯曲而表现出相对较低的刚度，这构成了挑战。剪切增稠液具有独特的剪切增稠效应，可以成为克服晶格结构限制的理想填料。在本文中，制备了将 STF 与新晶格结构相结合的复合材料，以通过实验和数值手段研究其动态响应，发现将 STF 纳入这些晶格结构中不仅保留了晶格结构固有的机械特性，而且还带来了实质性的改进关于机械性能。晶格结构的刚度显着提高，从 11.02 倍显着增加到 85.56 倍。此外，能量吸收也有所改善，从 2.78 倍到 5.51 倍。这些发现表明，与能量吸收能力相比，STF 在增强结构刚度方面更有希望。此外，还考虑了应变率、STF 的重量分数和晶格结构的单元尺寸，以进一步研究它们对 STF 填充晶格结构动态行为的影响。我们的研究结果表明，STF 填充后晶格结构的刚度和能量吸收的增加与应变率和重量分数的增加相关，但当晶格结构的单元尺寸增加时，刚度和能量吸收会减少。预测 STF 填充晶格结构的临界应变率约为 104 s，这表明 STF 中剪切增稠效应的开始。此外，据观察，STF 重量分数较高的复合材料对应变率的变化更敏感。此外，最初机械性能较低的结构在填充 STF 后经历了最显着的改进。这些最佳结果为实际应用中 STF 填充晶格结构的设计提供了宝贵的见解。