Abstract Interface plays a critical role in the mechanical performance of composites. Lack of a suitable interface design has long been a bottleneck impeding the full exploitation of the mechanical strengths of many superior reinforcement phases such as the high-performance carbon fibers and carbon nanotubes. Here a Floquet-based bar-spring model is developed to simulate the elastic and failure behaviors of three topological designs of heterogeneous interface inspired by the load-bearing biological materials in nature: end-concentrated, center-concentrated, and uniform pattern. Through comparative analyses, the advantages and disadvantages of every topological design are presented, and the guidelines of design optimization are summarized. The newly developed method is convenient and computationally economical for studying the mechanical behaviors of fiber/platelet reinforced composites. The study on the bioinspired design of interfaces not only shed lights on the interface strengthening and toughening mechanisms in natural materials but also give valuable guidelines for artificial interface designs.

中文翻译：

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基于 Floquet 的 Bar-Spring 模型对仿生异构接口的失效模拟和设计优化

摘要 界面对复合材料的力学性能起着至关重要的作用。长期以来，缺乏合适的界面设计一直是阻碍充分利用许多优异增强相（如高性能碳纤维和碳纳米管）的机械强度的瓶颈。这里开发了一个基于 Floquet 的杆弹簧模型，以模拟受自然界中承重生物材料启发的异构界面的三种拓扑设计的弹性和失效行为：端部集中、中心集中和均匀模式。通过对比分析，介绍了各种拓扑设计的优缺点，总结了设计优化的指导原则。新开发的方法对于研究纤维/板增强复合材料的力学行为既方便又计算经济。界面仿生设计的研究不仅揭示了天然材料中界面的强化和增韧机制，而且为人工界面设计提供了宝贵的指导。