民机货舱下部复合材料结构抗坠撞吸能特性试验研究

Study on the anti-crash energy absorption characteristic of composite structure in the sub-cargo structure

在可生存坠撞事故中,货舱下部复合材料结构是飞机坠撞过程中的主要吸能部件。货舱地板支撑立柱是货舱下部复合材料结构的主要支撑部件,研究其对货舱下部结构抗坠撞性能的影响尤为重要。针对不同立柱构型的典型民机货舱下部立柱组合件结构,开展了结构坠撞冲击试验。通过对结构失效模式和能量吸收情况进行对比分析,得到了货舱下部复合材料结构在坠撞速度为9.144 m/s时的抗坠撞吸能特性与立柱夹角、立柱厚度、触发形式等因素之间的关系。结果表明:当立柱夹角为90°、立柱厚度分段变化、立柱与框弱连接时,货舱下部复合材料结构的抗坠撞性能最好。

In a survivable crash,the sub-cargo structure is the main energy-absorbing component in the process of an aircraft crash.As an important energy-absorbing element during a crash,the composite stanchion has an important impact on the crash resistance of the sub-cargo structure.The vertical crash test of the sub-cargo structure was carried out.Comparing the structural deformation failure modes and energy absorption conditions,the relationship between energy absorption characteristics of the sub-cargo structure at a crash speed of 9.144 m/s and the angle of the stanchion,the thickness of the stanchion and the trigger form are obtained.The results show that when the angle of the stanchion is 90 degrees,the thickness of the stanchion varies in sections and the connection between the stanchion and the frame is weak,and the sub-cargo structure has the best energy-absorbing performance.