Abstract: In order to prevent the debonding failure between stiffener and skin due to shearing and bending loads during service of T-stiffened composite panel, stitching technology was introduced to improve the interface performance between stiffener flange and skin. The self-developed sti-tching machine was used to stitch dry fibers, then stitched preform was cured and formed by vacuum assisted resin infusion (VARI) technology, and stitched T-stiffened panel samples were prepared after demoulding. The reinforcement mechanism of stitching and effects of thread fineness on properties of T-joints were researched through shear and bend tests. Results show that, under shearing stress, the ultimate failure load of stitched samples is significantly higher than that of unstitched samples. With the increase of thread fineness, ultimate failure load of T-joints increases. When thread fineness increases to 1 500 D, the ultimate failure load increases by 55.0%. Under bending stress, as thread fineness increases, ultimate failure load increases first and then decreases. Stitching has no obvious effect on the initial failure load of T-joints under two different stresses.
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2021, Vol. 35 
