Abstract Up to date, a considerable experimental work has been performed to reveal the impact behavior of polymer foam core sandwich composites. Though, a few attempts have been made to integrate shear thickening fluids (STF) in closed cell rigid polyurethane foams (PU). STF possess a unique rheological property providing a rapid response to the structure against impact loads. The effects of STF on polymer foam cell morphology, thermal stability, and mechanical performance are investigated with advanced characterization techniques. The drop-weight impact test results of sandwich composites show that STF filled PU foam cores exhibit a higher energy absorption rate compared to its neat counterpart. Specific compressive strength and impact energy absorbing capability of STF filled PU foam cores increase with respect to the higher cell thickness-to-length ratios and higher cell densities achieved with STF inclusion. In addition, STF filled PU foam core sandwich composites are found to respond with lower damage width compared to neat PU foams.

中文翻译：

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剪切增稠液填充聚氨酯泡沫芯夹层复合材料的冲击响应

摘要 迄今为止，已经进行了大量的实验工作来揭示聚合物泡沫芯夹层复合材料的冲击行为。尽管如此，已经进行了一些尝试将剪切增稠液 (STF) 整合到闭孔硬质聚氨酯泡沫 (PU) 中。STF 具有独特的流变特性，可快速响应冲击载荷的结构。使用先进的表征技术研究了 STF 对聚合物泡沫细胞形态、热稳定性和机械性能的影响。夹层复合材料的落锤冲击试验结果表明，STF 填充的 PU 泡沫芯与其纯对应物相比具有更高的能量吸收率。STF 填充的 PU 泡沫芯材的比压缩强度和冲击能量吸收能力随着 STF 夹杂物获得的更高泡孔厚长比和更高泡孔密度而增加。此外，与纯 PU 泡沫相比，STF 填充的 PU 泡沫芯夹层复合材料的损伤宽度更小。