基于DIC的短切纤维增韧碳纤维复合材料Ⅰ型层间性能研究

doi:10.19936/j.cnki.2096-8000.20250928.002

摘要/Abstract

摘要： 短切纤维层间增韧作为一种高效、便捷的复合材料层间增韧方法,已经被广泛用于提升复合材料层间力学性能。目前研究缺乏针对短纤维插层碳纤维增强复合材料层间开裂过程三维图像试验信息的系统探究。本文制备了短切芳纶纤维和短切亚麻纤维增韧的碳纤维/环氧复合材料层合板,通过双悬臂梁(DCB)试验研究短切纤维的增韧效果,并采用数字图像相关法(DIC)研究短纤维插层增韧复合材料表面应变场和损伤演化过程,分析不同短切纤维层间增韧机理。试验结果表明,层间插入短切芳纶纤维和短切亚麻纤维均可大幅提升复合材料层合板的Ⅰ型断裂韧性,增韧后DCB试样分层损伤过程均出现纤维桥联和纤维拔出现象。相比短切亚麻纤维,短切芳纶纤维桥联和裂纹偏转现象更显著,层间增韧效果更好,研究结果可为复合材料性能优化奠定试验基础。

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

中图分类号:

TB332

邓裕, 涂昊昀. 基于DIC的短切纤维增韧碳纤维复合材料Ⅰ型层间性能研究[J]. 复合材料科学与工程, 2025, 0(9): 8-15.

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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