Composite structures are generally considered to be difficult to apply to joining components. A T-joint is an important element in aircraft structures that transfers loads between vertical and horizontal panels. However, T-joints present cracks that occur in the deltoid during their manufacture because of process-induced cure and thermal stress. Such cracking significantly reduces the mechanical performance of T-joints. Although a number of studies have been conducted on the behavior of T-joints under mechanical loading, studies on the behavior of T-joints during curing are limited. Therefore, this study is proposed to be the first to measure the strain distribution throughout the deltoid using an optical fiber. Firstly, three types of deltoid structures with differently oriented interlaminar toughened layers were used, and the relationship between the strain distribution and the failure pattern of the deltoid were examined. Based on the experimental results, finite element analysis is conducted and a failure index for the process-induced failure of deltoids was developed. Finally, a deltoid configuration to suppress process-induced failure was established and validated based on the results of the experiment and analysis.

通常认为复合结构难以应用于连接部件。T型接头是飞机结构中在垂直和水平面板之间传递载荷的重要元素。但是，由于工艺引起的固化和热应力，T型接头在其三角翼制造过程中会出现裂纹。这种开裂显着降低了T型接头的机械性能。尽管已经对机械载荷下T形接头的行为进行了许多研究，但对固化过程中T形接头的行为的研究仍然有限。因此，这项研究被认为是第一个使用光纤测量整个三角肌的应变分布的研究。首先，使用了三种类型的层状层间增韧层的三角肌结构，并研究了应变分布与三角型破坏模式之间的关系。基于实验结果，进行了有限元分析，并建立了由过程引起的三角肌故障的故障指标。最后，基于实验和分析的结果，建立并验证了抑制过程导致的故障的三角结构。