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| Study on Interlaminar Tensile Properties of Large Thickness Stitched Composites |
| YANG Hongyu 1,2,3, WU Ning 1,2, HAN Meiyue 1,2, ZHU Chao 1,2, CHEN Li 1,2 |
| （1. Tiangong University, Tianjin 300387, China; 2. Key Laboratory of Advanced Textile Composite Materials, Ministry of Education, Tiangong University, Tianjin 300387, China; 3. Nanjing Fiberglass Research & Design Institute Co., Ltd., Nanjing 210012, China） |
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Abstract In order to investigate the influence of the stitching process parameters on the interlaminar properties of large-thickness stitched composites, this paper prepared stitched composite specimens using a modified locking stitching technique combined with a vacuum-assisted resin infusion (VARI) molding process. The effects of the stitching spacing and prefabricated delamination position on the interlaminar tensile properties were tested using a universal material testing machine. The specimens were characterized by scanning electron microscopy (SEM) to determine the cross-sectional morphology after failure. The results showed that the interlaminar tensile properties of the specimens were best when the stitching spacing was 5mm×5mm and the prefabricated delamination position was at the depth of 17.5mm. The interlaminar fracture mode of the stitched composites was mainly presented as: fracture of the stitches after extraction from the matrix, direct fracture of the stitches within the matrix, and direct fracture of the stitches between the layers.
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2021, 
