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对缩短胶接面长度以提高起裂载荷的复合材料加筋壁板长桁终止端新型混合连接设计进行了研究。采用经试验验证的有限元方法,对长桁终止端混合连接的传载与失效机制进行分析,并研究了胶接面长度对结构起裂载荷的影响规律。研究结果表明:新型混合连接设计中紧固件提供的法向约束以及剪切载荷传递路径可显著提升终止端结构的起裂载荷,并增强终止端处界面的抑制损伤扩展能力;结构的起裂载荷随着胶接面的缩短而提高;当胶接面前缘退至连接区末排紧固件之后,可避免结构在最终破坏前发生界面失效,结构强度由蒙皮的机械连接强度决定。
A new type of hybrid joint design was studied for the termination of trusses of composite stiffened siding shortening the bond length and increasing the initiation load. The experimentally verified finite element method is used to analyze the transmission and failure mechanism of the hybrid connection at the terminal end of the long girder. The influence of the length of the bonded surface on the initiation load of the structure is studied. The results show that the normal restraint provided by the fastener in the new hybrid joint design and the shear load transfer path can significantly improve the initiation load of the terminated structure and enhance the restraining damage propagation ability of the interface at the termination end. The load increases with the shortening of the cemented surface; when the leading edge of the cemented surface retreats to the final row of fasteners in the connecting area, the interface failure can be avoided before the final failure. The structural strength is determined by the mechanical strength of the skin.