Effect of EMAA content on interlaminar fracture self-healing properties of plain woven carbon fiber composites

doi:10.19936/j.cnki.2096-8000.20220828.006

Abstract

Abstract: The effects of poly [ethylene-comethacrylic acid] (EMAA) content on the interlaminar fracture performance and repair effect of plain weave carbon fiber composites were investigated based on experimental and numerical methods. The EMAA self-healing unidirectional laminated carbon fiber composites were prepared using a three-dimensional suture toughening and staged curing process. The crack extension behavior and fracture toughness properties of the composites were investigated under loading and repair conditions based on type I interlaminar fracture toughness tests. The nonlinear spring model was used to study the discrete bridging mechanism. At the same time, numerical modeling and simulation calculation before and after repair were realized by using the double-zoned cohesive zone model and modified spring parameters. The results of the experimental and simulation studies show that the developed numerical models can predict the type I crack extension resistance curves and fracture toughness of the original and repaired composites with 3D self-repair networks more accurately. The incorporation of EMAA improves the actual toughness of interlaminar cracks. The interlayer toughness and repair efficiency are positively correlated with the content of EMAA.

Key words: composite material, self-healing, EMAA, interlaminar fracture toughness, the finite element method

CLC Number:

TB332

HU Ming-hao, GUO Pan-deng, TIE Ying, PI Xiao-fan, ZHANG Zhen-zhen. Effect of EMAA content on interlaminar fracture self-healing properties of plain woven carbon fiber composites[J]. COMPOSITES SCIENCE AND ENGINEERING, 2022, 0(8): 44-51.

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