Abstract The composite sandwich structures, as a representative of lightweight and high-strength structures, exhibit extraordinary engineering application potential. However, the weak connection between panel and core limits their application. This paper focuses on investigating the panel-core connection and impact properties of the carbon fiber reinforced polyether ether ketone (CF/PEEK) sandwich structure with truss core. An in-suit hot-pressing connection technology distinguishing from traditional brazing (for metal materials) and bonding (for thermosetting composites) methods is proposed for connecting panels and truss cores. The low velocity impact test were carried out to investigate the impact response and failure modes of the CF/PEEK sandwich structures. The finite element (FE) model is established to predict the structural response under low velocity impact loading. The impact response of the structure is analyzed using experimental and simulation results, which are affected by relative density of core, impact energy and impact site. Besides, parametric analyses on impactor diameter and unit cell number was carried out. This work provides guidance for studying the impact performance of composite sandwich structures.

中文翻译：

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具有桁架芯的CF/PEEK热塑性复合材料夹芯结构新型板芯连接工艺及冲击性能

摘要 复合夹层结构作为轻质高强结构的代表，具有非凡的工程应用潜力。然而，面板和核心之间的弱连接限制了它们的应用。本文重点研究具有桁架芯的碳纤维增强聚醚醚酮（CF/PEEK）夹层结构的板芯连接和冲击性能。提出了一种区别于传统钎焊（用于金属材料）和粘合（用于热固性复合材料）方法的套装热压连接技术，用于连接面板和桁架芯。进行低速冲击试验以研究 CF/PEEK 夹层结构的冲击响应和失效模式。建立有限元（FE）模型来预测低速冲击载荷下的结构响应。利用试验和模拟结果分析了结构的冲击响应，这些结果受核心相对密度、冲击能量和冲击部位的影响。此外，还对撞击器直径和晶胞数进行了参数分析。这项工作为研究复合夹层结构的冲击性能提供了指导。