Abstract

This paper experimentally and numerically investigates the failure behavior of plain woven composite-metal connection structures (T-joints) under loads in different directions. According to the direction of load application, it can be divided into TX specimens and TZ specimens. Wherein, TX and TZ are subjected to the tensile load parallel and perpendicular to the composite panel, respectively. Test results show significant differences in the ultimate load, failure modes and strain distribution among different specimens. Increasing the contact area between the lower block and the composite panel and adding round to the contact part between the metal part and the composite panel can improve the load-carrying capacity of the T-joints. The multiscale simulation is conducted to study the failure process of T-joints. Micro-scale and meso-scale models are established to obtain the mechanical properties of the plain woven composite, and the error between the simulated results and the experimental data is less than 10%. Progressive damage analysis is then done by using the macro-scale model. The simulated failure load and damage process of T-joints are consistent with the test results. The information and proposed multiscale analysis method on the failure behavior of T-joints are useful for the optimal design of similar structures.

中文翻译：

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研究接触面积和倒角对平纹复合金属 T 形接头失效行为的影响

摘要

本文通过实验和数值研究了平纹编织复合金属连接结构（T 型接头）在不同方向载荷下的失效行为。按载荷施加方向可分为TX试件和TZ试件。其中，TX和TZ分别承受与复合板平行和垂直的拉伸载荷。试验结果显示不同试件的极限载荷、破坏模式和应变分布存在显着差异。增加下块与复合板的接触面积，金属件与复合板接触部分加圆，可提高T型接头的承载能力。进行多尺度模拟来研究T型接头的失效过程。建立了微观和细观尺度模型，获得了平纹机织复合材料的力学性能，模拟结果与实验数据误差小于10%。然后使用宏观模型进行渐进损伤分析。模拟的T型接头失效载荷和损伤过程与试验结果一致。有关 T 形接头失效行为的信息和提出的多尺度分析方法对于类似结构的优化设计很有用。