短纤维插层对亚麻纤维增强复合材料层间增韧效果的实验与数值仿真研究

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中文摘要：本文分别通过双悬臂梁(DCB)实验与数值模拟，研究了不同短纤维插层(包括短纤维种类、短纤维长度与插层面密度)对亚麻纤维增强复合材料1型层间断裂韧性的影响规律。DCB试验结果表明，当插层为5 mm长度、25 g/m2面密度的短碳纤维插层时，复合材料Ⅰ型层间断裂韧性达到2。322 kJ/m2，取得最大提升幅度80。7％，短纤维桥联与亚麻连续纤维多层级破坏为其主要增韧机理。在此基础上，采用五参数控制的三线性内聚力单元，建立了数值仿真模型。实验与数值模拟结果的对比分析揭示了短纤维插层属性与内聚力模型参数之间的定量关系，可为植物纤维增强复合材料短纤维插层增韧设计提供参考依据。

外文标题：Experimental and numerical investigation into interlaminar toughening effect of chopped fiber-interleaved flax fiber reinforced composites

外文摘要：Effects of various chopped fiber(CF)interleaves,including CF type,CF length,and interleave areal density on mode I interlaminar toughening for flax fiber reinforced composites were studied via the double cantilever beam(DCB)experiment and simulation.The CF interleaved flax/epoxy composites were made by interleaving CFs randomly and uniformly in the mid-layer.A numerical model subject to the experiment was established involving the trilinear cohesive zone model(CZM)characterized by five parameters.The mode Ⅰ interlaminar fracture toughness(GIC)was furthest improved up to 2.322 kJ/m2 by 80.7％using carbon CF interleave with 5 mm CF length and 25 g/m2 areal density.The toughening mechanisms related to fiber bridging and flax multi-layer failure were discussed regarding different CF interleaves.Comparative analysis of numerical and experimental results revealed the quantitative relation between CZM parameters and CF interleave properties,providing guidance for designing CF interlaminar toughening.

外文关键词：

Flax fiber reinforced compositeChopped fiber interleaveFlax multi-layer failureInterlaminar fracture toughnessCohesive zone model

作者：

于本泽、李岩、涂昊昀、章中森

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作者单位：

School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai 200092,China

Key Laboratory of Advanced Civil Engineering Materials,Ministry of Education,Tongji University Shanghai 200092,China

关键词：

Flax fiber reinforced composite Chopped fiber interleave Flax multi-layer failure Interlaminar fracture toughness Cohesive zone model

基金：

国家自然科学基金

项目编号：

12132011

出版年：

2024

DOI：

10.1007/s10409-023-23287-X

力学学报(英文版)

CSTPCD

影响因子：0.363

ISSN：0567-7718

年,卷(期)：2024.40(1)

参考文献量39