Polymer composite joints are critical aerospace components for reinforcing lightweight structures and achieving high eco-efficiency transportation standards. Optimizing complex structural joints is an iterative process. Fast and reliable numerical approaches are needed to overcome the runtime limitations of high-fidelity Finite Element (FE) modeling. This work proposes a computationally efficient approach based on the design tool, HyperX. Verification against FE models and experimental validation are presented for the composite Y-joint in the D8 double bubble fuselage. Results show that the failure load of the Y-joint is predicted within 10% of the experimental failure load recorded. Two parametric studies are performed to study the effects of the curvature of the joint (110{\deg} - 160{\deg}) and the skin thickness (16ply, 24ply, 32ply) in the failure load predictions using a stress-based failure criterion. The maximum failure load occurred for a Y-joint with 130{\deg} curvature. The 32ply skin Y-joint was predicted to have the highest failure load. Results prove the applicability of rapid joint optimization analysis for faster, computationally efficient design.

翻译：聚合物复合材料接头是航空航天领域中用于增强轻质结构并实现高生态效率运输标准的关键部件。优化复杂结构接头是一个迭代过程。为克服高保真有限元建模的运行时限制，需要快速可靠的数值方法。本文提出了一种基于设计工具HyperX的高计算效率方法。针对D8双泡机身中的复合材料Y型接头，开展了与有限元模型的验证及实验确认。结果表明，Y型接头的失效载荷预测值与实验记录值之间的误差在10%以内。采用应力基失效准则，通过两项参数化研究分析了接头曲率（110°-160°）和蒙皮厚度（16层、24层、32层）对失效载荷预测的影响。最大失效载荷出现在曲率为130°的Y型接头中，而32层蒙皮的Y型接头预测具有最高失效载荷。结果证明了快速接头优化分析在实现更快、计算更高效设计中的适用性。