针对复合材料夹芯板结构非平面内连接要求，提出一种夹芯复合材料T型接头结构形式及其真空辅助成型制备方法。针对T型接头弯曲试件和剪切试件，分别开展三点弯曲试验和剪切试验，分析该型接头制备工艺稳定性、极限承载能力和破坏模式。研究结果表明：T型接头所采用的制备工艺稳定性较好；该接头弯曲刚度为1.44 kN/mm，极限弯矩达到1.15 kN·m；剪切刚度为230 N/mm，极限抗剪弯矩高于348 N·m。结构主要破坏模式：1）弯曲试件：梯形过渡区拐角处出现初始损伤，接头强度失效模式为梯形过渡区复合材料表层与填充芯材界面剥离；2）剪切试件：楔形搭接区端部初始剥离，继而45°增强层与夹芯板条界面剥离，最后，梯形过渡区复合材料表层与45°增强层和填充芯材之间界面剥离，结构崩溃破坏。%Aiming at the connection between non-plan composite sandwich plates,the configuration of a new composite sandwich T-joint and the corresponding vacuum assisted forming method are propounded. The three-point bending and shear test of the T-joint bending and shear specimens are carried out sepa-rately,and the fabricating process stability,limit capability,and failure modes are analysed. The results validates the stability of the fabricating process, where the bending stiffness and limit bending moment reach 1.44 kN/mm and 1.15 kN·m,respectively, and the shear stiffness and limit anti-shear bending mo-ment reach 230 N/mm and 348 N·m,respectively. The main failure modes include:1)Bending specimen:the initial damage appears at the corner of the trapezoidal transition zone, the interface delamination be-tween outer layer and filler of the transition zone, which represents the strength failure of the joint;2)Shear specimen:the interface delamination initially appears at the end of the cuniform lap zone and then moves to the region between the 45° enhance layer and sandwich batten;finally, the interface delamination between of the transition zone composite layer and filler emerges, while the delamination simultaneity appears at the interface between the 45° enhance layer and its filler, which causes the structure to collapse at last.
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