均布压力下T型连接极限承载特性试验研究

针对复合材料舵翼骨架与蒙皮连接，设计了两种T型连接结构，并对其在波浪砰击载荷作用下的极限承载特性进行了试验研究。根据结构承载特点，提取典型局部试验缩比模型，给出了均布压力下T型连接试验载荷等效方法。试验比较了两种T型连接的承载特性差异，研究了跨距对T型连接初始刚度、极限破坏载荷以及极限承载弯矩的影响规律。试验结果表明：构型A存在明显的初始破坏，但极限破坏载荷大于构型B；极限承载弯矩基本不随跨距改变，可作为不同跨距、不同构型T型连接优劣衡量标准。最后，基于试验结果、载荷等效与缩比原则，提出了T型连接承载特性评价方法。
Considering the connections between frame and skin of composite rudder, two types of T connections were designed to test the ultimate load carrying capacity when suffering to wave load. According to the load characteristics of structure, a typical local experimental model was extracted, and the load equivalence method was proposed as well. The difference of load characteristics of two types of T connections was compared, and the effect of span on initial stiffness, ultimate failure load and ultimate bearing moment were studied. The results show that type A has obvious initial failure, but the ultimate failure load is larger than that of type B, the ultimate bearing moment does not change with the span, and can be evaluation criterion for different span and different types of T connections. The evaluation method for bearing capacity of T connections was proposed based on the experimental results, load equivalent method and shrinkage principle.