Abstract

This work designed a T-shaped hook-connected structure composed of a bottom plate made of 2.5D woven composites and a T-shaped plate made of TC4 alloy. In order to explore to its bending and tensile properties, the corresponding experiments were designed and performed. Then, based on the progressive damage model and an improved Hashin’s failure criteria, numeral calculations were conducted in ANSYS to study its bending and tensile damage propagations. Compared with experimental results, the maximum error is less than 20 %, and the damage modes are similar, which proves the rationality of numerical calculation. In addition, both the experimental and simulation results show that the fatal damage both occurs at the constrained plate of the bottom plate whether in bending or tensile processes. Specifically, the fatal failure occurs at the installed edges in bending process or at the sides of groove-middle to groove-edge in tensile process. This work provides a design reference for typical T-shaped hook-connected composite structure, especially the connector of blade and casing, which appear in engineering and has good engineering application value.

中文翻译：

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2.5D编织复合材料和TC4合金制成的T形钩形连接结构的力学行为

摘要

这项工作设计了一个T形钩形连接结构，该结构由2.5D编织复合材料制成的底板和TC4合金制成的T形板组成。为了探究其弯曲和拉伸性能，设计并进行了相应的实验。然后，基于渐进式损伤模型和改进的Hashin破坏准则，在ANSYS中进行了数值计算，以研究其弯曲和拉伸损伤传播。与实验结果相比，最大误差小于20％，破坏模式相似，证明了数值计算的合理性。此外，实验和仿真结果均表明，无论是在弯曲过程中还是在拉伸过程中，致命损伤都发生在底板的约束板上。特别，致命故障发生在弯曲过程中安装的边缘或拉伸过程中凹槽中部到凹槽边缘的侧面。该工作为典型的T形钩扣式复合结构，特别是叶片与壳体的连接器的设计提供了参考，在工程上已经出现，具有良好的工程应用价值。