Research on mode Ⅰ interlaminar properties of chopped fiber-interleaved carbon fiber reinforced composites based on DIC

doi:10.19936/j.cnki.2096-8000.20250928.002

Abstract

Abstract: As an efficient and convenient interlaminar toughening method, chopped fiber interleaved composites has been widely used to enhance the interlaminar mechanical properties of composites. Current research lacks a systematic exploration of the three-dimensional image experimental data for the interlaminar cracking process in carbon fiber-reinforced composites with chopped fiber interlayers. In this study, carbon fiber/epoxy composite laminates toughened with chopped aramid fibers and chopped flax fibers were prepared. The toughening effects of chopped fibers were investigated through double cantilever beam (DCB) experiments, and digital image correlation (DIC) was employed to investigate the surface strain field and damage evolution in the chopped fiber interlayer-toughened composites. The interlaminar toughening mechanisms of different chopped fibers were analyzed. The experimental results demonstrated that the interlaminar insertion of chopped aramid fibers and chopped flax fibers significantly enhanced the mode Ⅰ fracture toughness of the composite laminates. During the delamination process in the toughened DCB specimens, fiber bridging and fiber pull-out phenomena were observed. Compared to chopped flax fibers, the chopped aramid fibers exhibited more pronounced fiber bridging and crack deflection, leading to better interlaminar toughening effects. These findings provide an experimental foundation for optimizing the performance of composite.

Key words: digital image correlation, carbon fiber reinforced composite, chopped fiber toughening, fracture toughness, fiber bridge, strain field

CLC Number:

TB332

DENG Yu, TU Haoyun. Research on mode Ⅰ interlaminar properties of chopped fiber-interleaved carbon fiber reinforced composites based on DIC[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(9): 8-15.

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