Abstract: In order to prevent delamination failure of composite laminates, stitching technology is introduced to improve the interlaminar fracture toughness of laminates. The self-developed stitching machine is used to stitch dry fibers, then the stitched preform is cured and formed by vacuum assisted resin infusion (VARI) technology, and the stitchedlaminates samples are prepared after demoulding. The effect of stitching density on the mode I interlaminar fracture toughness GIC of laminates was researched by DCB test, and the relationship between the failure mode of suture and interlaminar fracture toughness was explored. The effect of stitching density and suture diameter on laminates mode Ⅱ interlaminar fracture toughness GIICwas investigated using ENF test. The results show that: stitching can significantly hinder the propagation of interlaminar cracks. With the increase of stitching density, the mode I interlaminar fracture toughness of laminates increases significantly, and the mode Ⅱ interlaminar fracture toughness shows a trend of slightly decreasing at first and then increasing. The interlaminar fracture toughness increases with the increase of suture diameter. The test found that there are two types of suture failure: fracture and pullout. The higher the proportion of suture fracture, the higher the corresponding GIC.
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2020, Vol. 34 
