缝合增强复合材料层合板层间断裂韧性研究

doi:10.11896/cldb.19120241

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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 G_IC 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 G_IICwas 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 G_IC.

Key words： stitched laminates suture stitching density interlaminar fracture toughness delamination

Published: 02 December 2020

CLC number:

TB332

Fund:This work was financially supported byDefense Industrial Technology Development Program (JCKY2019204A001),Shanghai Aerospace Science and Technology Innovation Foundation(SAST2019-117).

About author:: Liwei Wenis currently an associate professor of Nanjing University of Aeronautics and Astronautics. He obtained a Ph.D. degree from Harbin Institute of Technology in 2005 and is now engaged in the research of advanced composites automatic forming technology. He has published more than 50 journal papers, applied 10 national invention patents.

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	WEN Liwei
	YU Kun
	FENG Qiaoqiao
	HUAN Huasong

Cite this article:

WEN Liwei,YU Kun,FENG Qiaoqiao, et al. Study on Interlaminar Fracture Toughness of Stitched Composite Laminates[J]. Materials Reports, 2020, 34(22): 22162-22166.

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http://www.mater-rep.com/EN/10.11896/cldb.19120241 OR http://www.mater-rep.com/EN/Y2020/V34/I22/22162

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