Abstract In this study, the foam sandwich panels were manufactured by integrating top facesheet and bottom facesheet with pyramidal lattice stitched core to overcome the weak interface between the core and skins of the sandwich structures. Low-velocity impact test and numerical simulation were conducted to reveal the failure mechanisms and energy absorption capacity at sandwich composite with foam core, different strut stitched foam core under different impact energy. The experimental results show showed that the strut core can improve the impact resistance of the specimen, and which is closely related to the diameter of the strut core. Compared with foam sandwich structure, pyramidal lattice stitched foam sandwich composites have comparable specific energy absorptions. The failure modes were also analyzed which is: fiber breakage, delamination, foam deformation and strut core breakage. The research presented here confirms that numerical simulation show good agreement with the experiment.

中文翻译：

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锥形点阵缝合泡沫夹层复合材料的制备及低速冲击响应

摘要 在本研究中，通过将顶面板和底面板与锥体格子缝合芯整合在一起来制造泡沫夹芯板，以克服夹芯结构的芯和表皮之间的弱界面。通过低速冲击试验和数值模拟，揭示了泡沫芯夹层复合材料、不同支柱缝合泡沫芯在不同冲击能量下的失效机理和能量吸收能力。实验结果表明，支撑芯可以提高试件的抗冲击性，且与支撑芯的直径密切相关。与泡沫夹层结构相比，金字塔点阵缝合泡沫夹层复合材料具有相当的比能量吸收。还分析了失效模式，即：纤维断裂、分层、泡沫变形和支柱芯断裂。这里提出的研究证实，数值模拟与实验显示出良好的一致性。